XANSYS Forum Index
    Register    

FAQ    Search    Memberlist    Usergroups    SmartFeedSmartFeed    Profile    Log in
Search found 140 matches
XANSYS Forum Index
Author Message
  Topic: [WB] Applying pressure on prejected surface, is it possible?
jose.galan

Replies: 8
Views: 12381

PostForum: XANSYS   Posted: Fri Jun 12, 2015 3:52 am   Subject: [Xansys] [WB] Applying pressure on prejected surface, is it
In my response I assumed that your pipe was modelled with pipe elements
(line elements). If you use shell elements, SURF154 would be your
choice, as Mr. Liddle pointed out in his post.

Best regards, ...
  Topic: [WB] Applying pressure on prejected surface, is it possible?
jose.galan

Replies: 8
Views: 12381

PostForum: XANSYS   Posted: Fri Jun 12, 2015 3:44 am   Subject: [Xansys] [WB] Applying pressure on prejected surface, is it
Dear Mr. Ghislain:

You can search the ansys help for section "2.5.7.6. Using Surface Effect
Elements to Apply Loads" (Mechanical APDL > Basic Analysis Guide)

"Sometimes, you may ...
  Topic: Static analysis, ANSYS vs. Stiffness Matrix
jose.galan

Replies: 13
Views: 15094

PostForum: XANSYS   Posted: Wed May 06, 2015 6:54 am   Subject: [Xansys] Static analysis, ANSYS vs. Stiffness Matrix
Dear Mr. Abreu,

a truss element does not have rotational dof. If your matlab code
includes 6 dof per node, I bet that it has beam elements (BEAM4 and
others, in ansys), not truss elements (LINK180 i ...
  Topic: [Workbench] Applying time-varying load in Static Structural
jose.galan

Replies: 6
Views: 6780

PostForum: XANSYS   Posted: Wed May 06, 2015 6:17 am   Subject: [Workbench] Applying time-varying load in Static Structural
Dear Ms. Saroha,
Your question seems a bit confusing. The topic of your post is about time-varying loads in an static analysis. Now you mention time-harmonic loads of 10 Hz. It is not clear what you ...
  Topic: [APDL] Determining Element Shape/Dimensionality
jose.galan

Replies: 6
Views: 6984

PostForum: XANSYS   Posted: Sun Apr 26, 2015 11:10 am   Subject: [Xansys] [APDL] Determining Element Shape/Dimensionality
Dear Mr. Diaz,

A 1D array is a simple way of hard coding the element dimensionality
information. This array would have as many rows as element name numbers
in ansys, and it would contain the element ...
  Topic: [APDL] Determining Element Shape/Dimensionality
jose.galan

Replies: 6
Views: 6984

PostForum: XANSYS   Posted: Sat Apr 25, 2015 4:55 pm   Subject: [Xansys] [APDL] Determining Element Shape/Dimensionality
Dear Mr. Diaz,

The dimensionality of an element is associated to the element number.

You can obtain the element type with the following command:

*GET, Par, ETYP, element_number, ATTR,ENAM,

For ...
  Topic: Elastic Support Problem
jose.galan

Replies: 8
Views: 9522

PostForum: XANSYS   Posted: Thu Mar 12, 2015 9:35 am   Subject: [Xansys] Elastic Support Problem
Dear Mr. Mirza:

If your model is 3D, and you are only applying normal restrains in two
perpendicular planes (uy=0 at y=0; ux=0 or Fx=kx*ux at x=0, according to
your simplifed sketch), there are stil ...
  Topic: in the substeps
jose.galan

Replies: 2
Views: 2559

PostForum: XANSYS   Posted: Thu Mar 12, 2015 4:35 am   Subject: [Xansys] in the substeps
Dear Mr. Suresh,

Use the following command:

OUTPR,ALL,ALL

Check the help on OUTPR command for additional info.

Best regards,

Jose M. Galan

Constr. Eng. Dept.

Univ. Sevilla

Spain

El 1 ...
  Topic: [Xansys] Stresses
jose.galan

Replies: 2
Views: 1940

PostForum: XANSYS   Posted: Wed Mar 11, 2015 5:23 am   Subject: [Xansys] Stresses
Dear Mr. Mileti,

you are experiencing a format problem. The numbers cannot be represented
with the fixed-point format F7.2 that you have specified. You should
simply change the format descriptor, in ...
  Topic: Elastic Support Problem
jose.galan

Replies: 8
Views: 9522

PostForum: XANSYS   Posted: Wed Mar 11, 2015 4:44 am   Subject: [Xansys] Elastic Support Problem
Dear Mr. Mirza,

I suspect that the springs are not being included correctly in your
model. That would explain the rigid body motion message that you
reported initially, and also the reduction of str ...
  Topic: [APDL] Compression only springs
jose.galan

Replies: 25
Views: 31135

PostForum: XANSYS   Posted: Tue Feb 24, 2015 8:31 am   Subject: [Xansys] [APDL] Compression only springs
There was a typo in my message: 50 MN=50e6 N

Jose M. Galan

Assistant Prof.

Constr. Eng. Dept.

Univ. Sevilla

Spain

El 24/02/2015 16:21, mfernan@us.es escribió:

Dear Mr. Martirosyan,

yo ...
  Topic: [APDL] Compression only springs
jose.galan

Replies: 25
Views: 31135

PostForum: XANSYS   Posted: Tue Feb 24, 2015 8:21 am   Subject: [Xansys] [APDL] Compression only springs
Dear Mr. Martirosyan,

you said that your simulation goes well, except when applying the
aceleration command. You do not mention the loading that you had on your
model when it worked well.

Have you ...
  Topic: Write data to a text file under Linux [APDL]
jose.galan

Replies: 7
Views: 9247

PostForum: XANSYS   Posted: Mon Jan 26, 2015 12:16 pm   Subject: [Xansys] Write data to a text file under Linux [APDL]
Dear Mr. Simoneau,

In the ansys help of *cfopen, the file extension is the third parameter
of the command (*CFOPEN, Fname, Ext, --, Loc). Have you tried replacing
the period with a comma? The new co ...
  Topic: Prestressed Cable Stayed Column Buckling Analysis
jose.galan

Replies: 12
Views: 11327

PostForum: XANSYS   Posted: Fri Dec 05, 2014 7:04 am   Subject: [Xansys] Prestressed Cable Stayed Column Buckling Analysis
Dear Mr. Callaghan,

if you want to know if your initial strain is correctly applied, you
should check the results of the static analysis. Check the values of the
reaction forces, and compare with th ...
  Topic: Prestressed Cable Stayed Column Buckling Analysis
jose.galan

Replies: 12
Views: 11327

PostForum: XANSYS   Posted: Fri Dec 05, 2014 6:53 am   Subject: [Xansys] Prestressed Cable Stayed Column Buckling Analysis
The bending stiffness of the column does actually change when it is
subjected to axial stresses, when the equilibrium equation is expressed
in the deformed configuration instead of in the undeformed
c ...
  Topic: [Xansys] Export of Mode Shapes
jose.galan

Replies: 4
Views: 7026

PostForum: XANSYS   Posted: Fri Nov 28, 2014 6:52 am   Subject: [Xansys] Export of Mode Shapes
Dear Mr. Andersen:

the code seems correct, as long as your node numbering is continuous
from 1 to NumNd. Remember that *vget loops over all the entity numbers,
even if they are not defined. Is your ...
  Topic: Infinite Elements for wave propagation
jose.galan

Replies: 11
Views: 15692

PostForum: XANSYS   Posted: Thu Oct 30, 2014 2:31 pm   Subject: [Xansys] Infinite Elements for wave propagation
You could try adding spring and dashpots at the boundaries (Lysmer and
Kuhlemeyer boundary conditions) to absorb the compressional and shear
waves. At each node, you have to add one spring and one das ...
  Topic: Infinite Elements for wave propagation
jose.galan

Replies: 11
Views: 15692

PostForum: XANSYS   Posted: Thu Oct 30, 2014 2:01 pm   Subject: [Xansys] Infinite Elements for wave propagation
Dear Mr. El-Ghandour,

if you look at the help (help/ans_elem/Hlp_E_CH3_2.html), you will see
that INFIN elements are only valid for magnetic, thermal, electrostatic
or electric current conduction pr ...
  Topic: [Xansys] [MAPDL] [STRUC] Simply Supported Plate mode shapes
jose.galan

Replies: 16
Views: 20282

PostForum: XANSYS   Posted: Thu Oct 30, 2014 11:55 am   Subject: [Xansys] [MAPDL] [STRUC] Simply Supported Plate mode shapes
Dear Mr. Gharaibeh:

since you have a square plate, the natural frequencies for the (m,n) and
(n,m) modes have the same value. When this repeated eigenvalue with
multiplicity 2 is found, the eigensol ...
  Topic: Array operation in post-pro APDL
jose.galan

Replies: 8
Views: 8850

PostForum: XANSYS   Posted: Thu Sep 18, 2014 8:42 am   Subject: [Xansys] Array operation in post-pro APDL
Dear Mr. Patel,

Not long ago there was a similar post on xansys. Here is the thread:

http://www.xansys.org/forum/viewtopic.php?t=25884&highlight=&sid=569076125f3a143b9773bfb6be6b8c96


Che ...
  Topic: [APDL] Problems saving plots to external jpeg files
jose.galan

Replies: 2
Views: 2182

PostForum: XANSYS   Posted: Thu Sep 18, 2014 6:39 am   Subject: [Xansys] [APDL] Problems saving plots to external jpeg files
Dear Mr. Cardeira,

The error is in the following set of commands. I have added some
comments

!Save current color map
/CMAP,_TEMPCMAP_,CMP,,SAVE
!Change color map to reverse black and white
!(i.e. ...
  Topic: [APDL] Finding path of file/recieving email from ansys
jose.galan

Replies: 5
Views: 7884

PostForum: XANSYS   Posted: Thu Sep 11, 2014 7:14 am   Subject: [Xansys] [APDL] Finding path of file/recieving email from an
Dear Mr. Mazurowski:

you can add snippets that will be used on the solution processor, by
placing them inside the "Static structural" item, but not inside the
"Solution" item.

...
  Topic: Eigenvalue Buckling Analysis with/without PSTRES
jose.galan

Replies: 9
Views: 15019

PostForum: XANSYS   Posted: Thu Sep 11, 2014 5:48 am   Subject: [Xansys] Eigenvalue Buckling Analysis with/without PSTRES
Dear Mr. Goel:

indeed, the buckling load depends on the support conditions. The
expression I sent you was the ideal buckling pressure for a full sphere
under uniform external pressure. You can find ...
  Topic: Eigenvalue Buckling Analysis with/without PSTRES
jose.galan

Replies: 9
Views: 15019

PostForum: XANSYS   Posted: Thu Sep 11, 2014 3:46 am   Subject: [Xansys] Eigenvalue Buckling Analysis with/without PSTRES
Dear Mr. Goel:

doing a google search on "buckling load glass dome" you may finnd some
interesting references.

For example, Jaap Aanhaanen's MS thesis, "The stability of a glass
face ...
  Topic: Eigenvalue Buckling Analysis with/without PSTRES
jose.galan

Replies: 9
Views: 15019

PostForum: XANSYS   Posted: Thu Sep 11, 2014 3:32 am   Subject: [Xansys] Eigenvalue Buckling Analysis with/without PSTRES
Dear Mr. Goel:

in the documentation the mention what you say in your email: that
pstres,on is required in the static analysis. With this command the user
asked Ansys to calculate and store the tange ...
  Topic: [APDL] Finding path of file/recieving email from ansys
jose.galan

Replies: 5
Views: 7884

PostForum: XANSYS   Posted: Thu Sep 11, 2014 2:29 am   Subject: [Xansys] [APDL] Finding path of file/recieving email from an
Dear Mr. Mazurowski:

you can use the command /INQUIRE to obtain that type of information and
store it in a parameter.

/INQUIRE,PathToRSTFile,RSTDIR

Best regards,

Jose M. Galan

Constr. Eng. D ...
  Topic: [Xansys] Linear buckling load lesser than nonlinear buckling
jose.galan

Replies: 2
Views: 3228

PostForum: XANSYS   Posted: Wed Sep 03, 2014 4:48 am   Subject: [Xansys] Linear buckling load lesser than nonlinear buckling
Dear Mr. Franklin:

You should look at the post-buckling behaviour of structures, and how
differently bars, plates and shells behave. You will find that
information in any textbook. For example, you ...
  Topic: Shell181: In-plane forces and moment UNITS
jose.galan

Replies: 2
Views: 5457

PostForum: XANSYS   Posted: Wed Sep 03, 2014 4:24 am   Subject: [Xansys] Shell181: In-plane forces and moment UNITS
Dear Mr. Goel:

I think that what you said is not correct for N11.

In the usual strength of material notation for plates, the first
subscript (i=1,2, or x,y) indicates the plate edge (xi=constant, ...
  Topic: [STRUC] Modal Analysis of a DrillString
jose.galan

Replies: 22
Views: 20690

PostForum: XANSYS   Posted: Wed Sep 03, 2014 3:57 am   Subject: [Xansys] [STRUC] Modal Analysis of a DrillString
Dear Mr. Kho:

I would like to give you some simple checks. When using keyopt(3)=1, you
need two non-coincident nodes to create a combin 14 element. In
addition, if you want a torsional spring about ...
  Topic: [STRUC] Modal Analysis of a DrillString
jose.galan

Replies: 22
Views: 20690

PostForum: XANSYS   Posted: Sun Aug 24, 2014 10:32 am   Subject: [Xansys] [STRUC] Modal Analysis of a DrillString
Dear Mr. Kho:

you should review the concepts of moment of inertia in a strength of
materials textbook, and the concept of rotational inertia in any physics
book. I would also suggest that you read s ...
  Topic: [STRUC] Modal Analysis of a DrillString
jose.galan

Replies: 22
Views: 20690

PostForum: XANSYS   Posted: Sun Aug 24, 2014 6:41 am   Subject: [Xansys] [STRUC] Modal Analysis of a DrillString
Dear Mr. Kho:

Notice that in VM57 all the degrees of freedom of the line are
constrained except the ROTZ. By doing so, only torsional modes are
calculated. You may try that in your model.

In your ...
  Topic: [STRUC] Modal Analysis of a DrillString
jose.galan

Replies: 22
Views: 20690

PostForum: XANSYS   Posted: Sun Aug 24, 2014 2:37 am   Subject: [Xansys] [STRUC] Modal Analysis of a DrillString
Dear Mr. Kho:

You have not mentioned what element number have you used.

Have you used 2-D beam elements such as BEAM3 or BEAM23? They do not
have torsional degrees of freedom. They can model axial ...
  Topic: Select Nodes Along Edge
jose.galan

Replies: 5
Views: 8036

PostForum: XANSYS   Posted: Mon Aug 18, 2014 8:59 am   Subject: [Xansys] Select Nodes Along Edge
Dear Mr. Tuncoz:

perhaps it will be easier to select lines or areas on that edge, instead
of nodes. After selecting the appropiate lines or areas, you can select
the nodes attached to them (see comm ...
  Topic: [Xansys] Plastic Strain
jose.galan

Replies: 4
Views: 5619

PostForum: XANSYS   Posted: Sun Aug 17, 2014 7:04 am   Subject: [Xansys] Plastic Strain
Dear Mr. Shah,

you should look at the stresses at integration points rather than at
nodes. Remember that the elastic-plastic stress-strain law is enforced
at each integration point individually, but ...
  Topic: Element coordinate system - White, Green and Blue axis
jose.galan

Replies: 2
Views: 3177

PostForum: XANSYS   Posted: Sun Aug 17, 2014 6:52 am   Subject: [Xansys] Element coordinate system - White, Green and Blue a
Dear Mr. Goel,

in the help of the /PSYMB command you can find the following
information:

"Triads are right-handed with x displayed as the longest leg. Where
color is displayed, x is white, y ...
  Topic: [Xansys] Bilinear analysis fro beam188
jose.galan

Replies: 10
Views: 9700

PostForum: XANSYS   Posted: Tue Aug 12, 2014 10:11 am   Subject: [Xansys] Bilinear analysis fro beam188
Dear Juan Carlos:

Don't forget to include your full name and affiliation (company name) on
all your xansys post. Those are xansys rules, and there are consequences
for not complying them.

You can ...
  Topic: [Xansys] Bilinear analysis fro beam188
jose.galan

Replies: 10
Views: 9700

PostForum: XANSYS   Posted: Tue Aug 12, 2014 9:48 am   Subject: [Xansys] Bilinear analysis fro beam188
Dear Mr. Peteiro:

for that non-standard cross-section, you will be defining a 2D solid
model of your cross-section geometry, and then you use the command
SECWRITE. Ansys creates a mesh of your 2D so ...
  Topic: [Xansys] Bilinear analysis fro beam188
jose.galan

Replies: 10
Views: 9700

PostForum: XANSYS   Posted: Tue Aug 12, 2014 4:25 am   Subject: [Xansys] Bilinear analysis fro beam188
Dear Mr. Peteiro:

please, check the ansys help on BEAM188 element. The cross-section is
meshed with cells. By default, a 2x2 mesh is used for rectangular
cross-sections.

"When the material as ...
  Topic: [Xansys] Bilinear analysis fro beam188
jose.galan

Replies: 10
Views: 9700

PostForum: XANSYS   Posted: Tue Aug 12, 2014 3:25 am   Subject: [Xansys] Bilinear analysis fro beam188
Dear Mr. Peteiro:

wouldn't you also need to specify yield stress?

Have you checked your units?

Have you compared the cross-section properties (area, moment of inertia
about weak and strong axis) ...
  Topic: Creating inclined boundary conditions in APDL
jose.galan

Replies: 11
Views: 12121

PostForum: XANSYS   Posted: Tue Aug 05, 2014 9:33 am   Subject: [Xansys] Creating inclined boundary conditions in APDL
Dear Mr. Goel,

You are right, your units are consistent.

Those constrains in theta direction are a good idea, and they will stop
the rotation around the global Z axis.

You can check if all the r ...
  Topic: sorting table data
jose.galan

Replies: 1
Views: 2619

PostForum: XANSYS   Posted: Tue Aug 05, 2014 9:00 am   Subject: [Xansys] sorting table data
Dear Mr. Richardson:

in the ansys help, Mechanical APDL, 3.10.7.2. Matrix Operations
(help/ans_apdl/Hlp_P_APDL3_11.html) you can find a simple example on
using *moper to sort a small (5x3) array in ...
  Topic: Creating inclined boundary conditions in APDL
jose.galan

Replies: 11
Views: 12121

PostForum: XANSYS   Posted: Tue Aug 05, 2014 8:51 am   Subject: [Xansys] Creating inclined boundary conditions in APDL
Dear Mr. Goel:

I apologize, your boundary condition was right. My mistake.

You rotate the element coordinate system into the global spherical
coordinate system with the command Esys,12. Those orie ...
  Topic: Creating inclined boundary conditions in APDL
jose.galan

Replies: 11
Views: 12121

PostForum: XANSYS   Posted: Mon Aug 04, 2014 5:35 am   Subject: [Xansys] Creating inclined boundary conditions in APDL
Dear Mr. Goel:

to check if your nodes are properly rotated, you can show the nodal
coordinate system in your plots. This is done with the command

/PSYMB,ndir,1

Then, use nplot or eplot and visua ...
  Topic: Reinforced Concrete Beam in Ansys Workbench
jose.galan

Replies: 17
Views: 27020

PostForum: XANSYS   Posted: Mon Aug 04, 2014 5:14 am   Subject: [Xansys] Reinforced Concrete Beam in Ansys Workbench
I noticed a typing error. The command to enter the time-history
postprocessor is /post26

Best regards,

Jose M. Galan

Constr. Engin. Dept.

Universidad de Sevilla

Spain

El 04/08/2014 14:07, m ...
  Topic: Reinforced Concrete Beam in Ansys Workbench
jose.galan

Replies: 17
Views: 27020

PostForum: XANSYS   Posted: Mon Aug 04, 2014 5:07 am   Subject: [Xansys] Reinforced Concrete Beam in Ansys Workbench
Dear Mr. Ganesan:

the time-history postprocessor (/post26) is what you need. You can
define variables containing the results at a given node or element
versus time. The commands are NSOL and ESOL. T ...
  Topic: Second derivative of temperature over time
jose.galan

Replies: 7
Views: 6105

PostForum: XANSYS   Posted: Fri Aug 01, 2014 12:09 am   Subject: [Xansys] Second derivative of temperature over time
Dear Mr. Unobe,

you can store the nodal temperature in a variable with the command nsol

!obtain node at a certain position

indnode=node(10.0,3.2,1,1)

!store nodal temperature in variable 2

! ...
  Topic: [XANSYS][APDL]allocate CPU and memory
jose.galan

Replies: 27
Views: 33761

PostForum: XANSYS   Posted: Mon Jul 28, 2014 3:55 am   Subject: [Xansys] [XANSYS][APDL]allocate CPU and memory
Dear Mr. Shen:

when I read in your email about the 2GB memory limit it reminded me of
the memory limitations of 32-bit software. It may be too obvious, but it
would not hurt to check that you actual ...
  Topic: Creating inclined boundary conditions in APDL
jose.galan

Replies: 11
Views: 12121

PostForum: XANSYS   Posted: Thu Jul 24, 2014 8:17 am   Subject: [Xansys] Creating inclined boundary conditions in APDL
Dear Mr. Goel:

it seems that you are using the command NORA that rotates the nodal
coordinate systems to the surface normal. Is this correct?

If you see the help on that command, you can see it ro ...
  Topic: [Xansys] [WB] Modal analysis of the turbine
jose.galan

Replies: 4
Views: 4445

PostForum: XANSYS   Posted: Thu Jul 24, 2014 4:14 am   Subject: [Xansys] [WB] Modal analysis of the turbine
Cyclic symmetry is different from the basic symmetry and antisymmetry
b.c.

With cyclic symmetry, you convert a 360deg linear problem with a large
number of elements Nel, into m uncoupled problems on ...
  Topic: Truncating
jose.galan

Replies: 3
Views: 3006

PostForum: XANSYS   Posted: Mon Jul 21, 2014 11:54 am   Subject: [Xansys] Truncating
Dear Mr. Dhara,

check the functions NINT(x) and MOD(x,y) in the ansys help.

help/ans_apdl/Hlp_P_APDL3_9.html

You could use nint(x*1e4)/1e4.

Best regards,

Jose M. Galan

Constr. Engin. Dept. ...
  Topic: [Xansys] Fleming's rule for OMEGA command
jose.galan

Replies: 7
Views: 7045

PostForum: XANSYS   Posted: Wed Jul 09, 2014 3:32 am   Subject: [Xansys] Fleming's rule for OMEGA command
Dear Mr. Franklin,
the answer is yes. That is the normal vector representation in physics.
Best regards,
Jose M. Galan
Constr. Eng. Dept.
Univ. Sevilla
Spain
  Topic: Creating inclined boundary conditions in APDL
jose.galan

Replies: 11
Views: 12121

PostForum: XANSYS   Posted: Wed Jul 09, 2014 3:18 am   Subject: [Xansys] Creating inclined boundary conditions in APDL
Dear Mr. Goel,

you can rotate the nodal system of coordinates of all the nodes on the
support. Check the commands nmodif,nrotat,nang, nora.

Best regards,

Jose M. Galan

Constr. Eng. Dept.

Uni ...
  Topic: Use of pilot nodes for contact coupling
jose.galan

Replies: 1
Views: 4787

PostForum: XANSYS   Posted: Tue Jul 08, 2014 9:21 am   Subject: [Xansys] Use of pilot nodes for contact coupling
Dear Mr. Samarakkody,

Regarding your question, in the Ansys help on TARGE169, in the section
"TARGE169 Assumptions and Restrictions", you will find the following
comment:

"For each ...
  Topic: [Xansys] Add scalar parameters
jose.galan

Replies: 8
Views: 8297

PostForum: XANSYS   Posted: Tue Jul 08, 2014 4:12 am   Subject: [Xansys] Add scalar parameters
Dear Mr. Bouillon,

you may also consider storing the parameters in an array.

*dim,lvec,array,12

lvec(1)=73.5,105,54.5

lvec(12)=20

If you want to sum some some elements of the array, you can ...
  Topic: Workbench Meshing tutorials
jose.galan

Replies: 16
Views: 17509

PostForum: XANSYS   Posted: Tue Jul 08, 2014 3:55 am   Subject: [Xansys] Workbench Meshing tutorials
Students can have access to a student version of the customer portal
(the ansys student portal). The professor should register previously in
the ansys customer portal, and then he should provide his s ...
  Topic: Retrive Real & Imag Freq for All the Modes in a DAMP Fre
jose.galan

Replies: 5
Views: 4984

PostForum: XANSYS   Posted: Fri Jul 04, 2014 2:21 am   Subject: [Xansys] Retrive Real & Imag Freq for All the Modes in a
I agree with both comments.

Jose M. Galan

Univ. Sevilla

Spain

El 04/07/2014 04:43, Christopher Wright escribió:

On Jul 3, 2014, at 4:20 AM, mfernan@us.eswrote:

It can be a good approximati ...
  Topic: Assigning SOLID65 to triangular mesh
jose.galan

Replies: 5
Views: 5288

PostForum: XANSYS   Posted: Thu Jul 03, 2014 10:18 am   Subject: [Xansys] Assigning SOLID65 to triangular mesh
Dear Mr. Gkiokas,

in the ansys manual says that EDP in PLANE182 (and PLANE183) is not
applicable for plane stress, just the opposite of what you said in your
post. PLANE182 provides other element be ...
  Topic: Assigning SOLID65 to triangular mesh
jose.galan

Replies: 5
Views: 5288

PostForum: XANSYS   Posted: Thu Jul 03, 2014 6:13 am   Subject: Assigning SOLID65 to triangular mesh
Dear Mr. Gkiokas,
in your first post you said that you had a mesh of triangular elements of an arch. That means that you have a plane model. You should use PLANE elements. PIPE289 is a line element, ...
  Topic: [Xansys] [EXPLICIT] Tiebreak contact definition
jose.galan

Replies: 3
Views: 3661

PostForum: XANSYS   Posted: Thu Jul 03, 2014 4:15 am   Subject: [Xansys] [EXPLICIT] Tiebreak contact definition
Dear Mr. Kazaz,

in your post you do not mention anything about your loads. Could you
please describe them?

Have you checked the computed values of normal and shear stresses in
your contact zone? A ...
  Topic: Assigning SOLID65 to triangular mesh
jose.galan

Replies: 5
Views: 5288

PostForum: XANSYS   Posted: Thu Jul 03, 2014 4:08 am   Subject: Assigning SOLID65 to triangular mesh
Dear Mr. Gkiokas,
in previous versions of Ansys the Drucker-Prager model (TB,DP) could also be applied to some PLANE elements.

In Ansys 11 help, it mentions the following:
"DP — Drucker- ...
  Topic: Retrive Real & Imag Freq for All the Modes in a DAMP Fre
jose.galan

Replies: 5
Views: 4984

PostForum: XANSYS   Posted: Thu Jul 03, 2014 2:20 am   Subject: [Xansys] Retrive Real & Imag Freq for All the Modes in a
Dear Mr. Thompson,

I think that your main question is if a mass without rotary inertia is a
good mathematical model of the real behaviour of your equipment. It
depends.

It can be a good approximat ...
  Topic: [Xansys] [EXPLICIT] Tiebreak contact definition
jose.galan

Replies: 3
Views: 3661

PostForum: XANSYS   Posted: Wed Jul 02, 2014 8:26 am   Subject: [Xansys] [EXPLICIT] Tiebreak contact definition
Dear Mr. Kazaz,

"The tied contact options actually 'glue' the contact nodes (surfaces)
to the target surfaces."

"Tiebreak contact is identical to tied contact except that the contac ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Wed Jul 02, 2014 5:40 am   Subject: [Xansys] 2D Orthotropic Material Workbench
Thank you for the feedback.

Best regards,

Jose M. Galan

Constr. Eng. Dept.

Univ. Sevilla

Spain

El 02/07/2014 14:36, ilhan.tuncoz escribió:

Dear Mr. Galan,

Thank you for your extensive ...
  Topic: [Xansys] [STRUCT] Modal characteristics correlation
jose.galan

Replies: 3
Views: 3999

PostForum: XANSYS   Posted: Wed Jul 02, 2014 4:55 am   Subject: [Xansys] [STRUCT] Modal characteristics correlation
Dear Mr. Gharaibeh,

you are trying to solve an inverse problem that is usually called "model
updating" in the literature. You may even find some books on the
subject:

Finite Element Mode ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Wed Jul 02, 2014 4:23 am   Subject: [Xansys] 2D Orthotropic Material Workbench
Dear Mr. Tuncoz,

From your comments, it is clear that your material is not transversely
isotropic.

In the MSC Nastran 2004 Reference Manual
(http://simcompanion.mscsoftware.com/infocenter/index?pa ...
  Topic: [Xansys] Writing results only at a particular time
jose.galan

Replies: 8
Views: 7067

PostForum: XANSYS   Posted: Wed Jul 02, 2014 1:51 am   Subject: [Xansys] Writing results only at a particular time
Dear Mr. Franklin,

another option is adding two intermediate load steps at the times where
you want the solution (0.8 and 1). By default, ansys stores all the
results at the last substep of each loa ...
  Topic: [STRUCT] Contact Postprocessing by Result
jose.galan

Replies: 4
Views: 4681

PostForum: XANSYS   Posted: Tue Jul 01, 2014 10:13 am   Subject: [Xansys] [STRUCT]
Dear Mr. Kelly,

As a starting point, I would suggest using a simple (back of the
envelope) strength of material calculation of the 4-point bend case to
obtain the deflection and rotation of the pin ...
  Topic: Element Number 2046 has negative volume due to excessive...
jose.galan

Replies: 2
Views: 1182

PostForum: XANSYS   Posted: Mon Jun 30, 2014 1:05 am   Subject: [Xansys] Element Number 2046 has negative volume due to exce
Dear Mr. Khan,

the MORPH command has the option to remesh when element qualities fall
below certain values. You should activate that option. Please review the
ansys manual on MORPH command.

Best r ...
  Topic: Correct cubic geometry in ANSYS for uniaxial tensile test
jose.galan

Replies: 5
Views: 3958

PostForum: XANSYS   Posted: Fri Jun 27, 2014 10:08 am   Subject: Correct cubic geometry in ANSYS for uniaxial tensile test
Dear Mr. Gkiokas,
there is another way of specifying your bc's:
(1) Restrain x displacement UX=0 at x=0.
(2) Restrain the remaining three rigid body modes (displacement along Y, displacement along ...
  Topic: Correct cubic geometry in ANSYS for uniaxial tensile test
jose.galan

Replies: 5
Views: 3958

PostForum: XANSYS   Posted: Fri Jun 27, 2014 9:53 am   Subject: Correct cubic geometry in ANSYS for uniaxial tensile test
Dear Mr. Gkiokas,
did you add the bc at node 3?
Both methods of assigning the BC's are equivalent, but my suggestion is more convenient when you have more than a few elements.

The non-constant si ...
  Topic: Retrive Real & Imag Freq for All the Modes in a DAMP Fre
jose.galan

Replies: 5
Views: 4984

PostForum: XANSYS   Posted: Fri Jun 27, 2014 4:10 am   Subject: [Xansys] Retrive Real & Imag Freq for All the Modes in a
Dear Mr. Thompson,

If you look at the help of the *get command, right below Table 176 (*GET
solution items, Entity=MODE), you will see that the command that you
mention only retrieves the values cor ...
  Topic: Correct cubic geometry in ANSYS for uniaxial tensile test
jose.galan

Replies: 5
Views: 3958

PostForum: XANSYS   Posted: Tue Jun 24, 2014 5:27 am   Subject: [Xansys] Correct cubic geometry in ANSYS for uniaxial tensil
Dear Mr. Gkiokas,

in your 10x10x10 cube, you intend to apply a prescribed ux displacement
at x=10 and symmetry boundary conditions at faces x=0, y=0 and z=10.
Those b.c. exactly reproduce pure tract ...
  Topic: [Xansys] [APDL] How to specify periodic boundary condition i
jose.galan

Replies: 10
Views: 13544

PostForum: XANSYS   Posted: Tue Jun 24, 2014 1:38 am   Subject: [Xansys] [APDL] How to specify periodic boundary condition i
Dear Mr. Mukherjee,

CPCYC is valid for cartesian coordinate systems too, and it is
applicable to your problem.

In the command help it states that, in the choses system of coordinates,
"node 1 ...
  Topic: [apdl] how to do average in /post26
jose.galan

Replies: 3
Views: 3435

PostForum: XANSYS   Posted: Mon Jun 23, 2014 12:23 pm   Subject: [Xansys] [apdl] how to do average in /post26
Dear Mr. Podder,

another option could be to use the commands available in /post26 to
postprocess the results. Please, check the ansys manual

Mechanical APDL > Basic Analysis Guide > Chapter ...
  Topic: [Xansys] Cyclic Symmetry, ANSYS classic
jose.galan

Replies: 3
Views: 4358

PostForum: XANSYS   Posted: Mon Jun 23, 2014 12:03 pm   Subject: [Xansys] Cyclic Symmetry, ANSYS classic
Dear Mr. Meade,

I recommend you to read the following section of the ansys manual

Mechanical APDL > Advanced Analysis Guide > Chapter 7. Cyclic Symmetry
Analysis > 7.2. Cyclic Modeling

...
  Topic: Volumetric Heat Source function
jose.galan

Replies: 1
Views: 1391

PostForum: XANSYS   Posted: Mon Jun 23, 2014 9:37 am   Subject: [Xansys] Volumetric Heat Source function
Dear Mr. Mondal,

the best option would be to define a tabular load, depending on X, Y, Z
and TIME. The values stored in the tabular load would be calculated in
terms of the scalar parameters a,b and ...
  Topic: Concrete model for modeling softening behaviour
jose.galan

Replies: 6
Views: 6559

PostForum: XANSYS   Posted: Mon Jun 23, 2014 8:38 am   Subject: [Xansys] Concrete model for modeling softening behaviour
Dear Mr. Gkiokas,

the William and Warnke constitutive model for concrete (implemented in
Ansys TB,CONCR material) are formulated for elastic perfectly plastic
behaviour in compression and elastic pe ...
  Topic: [Xansys] Green-Lagrange strain
jose.galan

Replies: 1
Views: 1525

PostForum: XANSYS   Posted: Mon Jun 23, 2014 2:59 am   Subject: [Xansys] Green-Lagrange strain
Dear Mr. Testi:

for problems with finite strains and deformations, the small-strain
approximation (displacement-gradient components very small compared to
unity) is not valid. There are two possible ...
  Topic: [Xansys] Cyclic Symmetry, ANSYS classic
jose.galan

Replies: 3
Views: 4358

PostForum: XANSYS   Posted: Sun Jun 22, 2014 3:17 am   Subject: [Xansys] Cyclic Symmetry, ANSYS classic
Dear Mr. Meade,
On cyclic symmetry models it is critical to have matching meshes on the lower and upper edges ot the unit sector, in order to automatically find pairs of matching nodes to write the c ...
  Topic: [STRUCT] 2D Axisymmetric Global Model to 3D Submodel
jose.galan

Replies: 4
Views: 6767

PostForum: XANSYS   Posted: Fri Jun 20, 2014 3:31 pm   Subject: [STRUCT] 2D Axisymmetric Global Model to 3D Submodel
They are quite different. The cyclic symmetry b.c. actually writes a set of coupling equations between the d.o.f. of corresponding nodes (i.e.located at the same radial position) at both edges (theta ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Fri Jun 20, 2014 8:30 am   Subject: [Xansys] 2D Orthotropic Material Workbench
If the plane x2-x3 is a plane of isotropy, there are four relationships
between the 9 orthotropic constants:

E2=E3

G12=G13

nu12=nu13

G23=E2/(2*(1+nu23))

Please, read carefully how these elas ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Fri Jun 20, 2014 8:13 am   Subject: [Xansys] 2D Orthotropic Material Workbench
Dear Mr. Tuncoz:

if your material is fully orthotropic, you should also know E33, nu13
and nu32.

However, I would like to ask you about the known values of the three
shear modulus of your material ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Fri Jun 20, 2014 6:13 am   Subject: [Xansys] 2D Orthotropic Material Workbench
In my previous meail I meant 5 independent ELASTIC constants and 9
independent ELASTIC constants.

Density must be defined additionally, but it does not influence the
constitutive matrix of the mater ...
  Topic: 2D Orthotropic Material Workbench
jose.galan

Replies: 9
Views: 14876

PostForum: XANSYS   Posted: Fri Jun 20, 2014 4:13 am   Subject: [Xansys] 2D Orthotropic Material Workbench
Dear Mr. Tuncoz,

Each layer of a composite laminate is transversely isotropic (5
independent material constants) rather than orthotropic (9 independent
material constants). However, in ansys you onl ...
  Topic: [STRUCT] 2D Axisymmetric Global Model to 3D Submodel
jose.galan

Replies: 4
Views: 6767

PostForum: XANSYS   Posted: Thu Jun 19, 2014 5:57 pm   Subject: [Xansys] [STRUCT] 2D Axisymmetric Global Model to 3D Submode
Dear Mr. Kelly,

You may consider creating a cycling symmetry model of a small angular
sector of you structure (Advanced Guide | Chapter 7. Cyclic Symmetry
Analysis). This sector is meshed with 3D el ...
  Topic: [APDL] Modelling layered composite with dropped layers
jose.galan

Replies: 8
Views: 11910

PostForum: XANSYS   Posted: Thu Jun 19, 2014 4:23 pm   Subject: [Xansys] [APDL] Modelling layered composite with dropped lay
Dear Mr. Stepanenko,

by looking at the sketch of your wing box structure, it seems that all
the red lines are parallel. This simplifies the selection of zones
between two consecutive red lines. You ...
  Topic: [APDL] Modelling layered composite with dropped layers
jose.galan

Replies: 8
Views: 11910

PostForum: XANSYS   Posted: Thu Jun 19, 2014 2:11 am   Subject: [APDL] Modelling layered composite with dropped layers
Dear mr. Stepanenko,
I think that,after meshing an area with a certain section, you can still use the command EMODIF to change the section (or other attributes) of the elements that have a different ...
  Topic: [APDL] Modelling layered composite with dropped layers
jose.galan

Replies: 8
Views: 11910

PostForum: XANSYS   Posted: Wed Jun 18, 2014 9:27 am   Subject: [Xansys] [APDL] Modelling layered composite with dropped lay
Dear Mr. Stepanenko:

I haven't any experience with multilayered elements, but let me share
some thoughts.

In the SHELL181 element reference (Elements Reference | Part I, Element
Library | SHELL181 ...
  Topic: NODE values in tables
jose.galan

Replies: 8
Views: 7801

PostForum: XANSYS   Posted: Tue Jun 17, 2014 10:29 am   Subject: [Xansys] NODE values in tables
You could try mpchg.

You may also consider creating a function in fortran with your own
material model through User Programmable Features. For this latter
option, you should check the Programmer's M ...
  Topic: Load cases for fatigue analysis
jose.galan

Replies: 8
Views: 7023

PostForum: XANSYS   Posted: Tue Jun 17, 2014 5:05 am   Subject: [Xansys] Load cases for fatigue analysis
Dear Mr. Cerullo,

I noticed that you had added your signature at the end of your message.
I apologize for the undeserved reprimand. My mistake.

Jose M. Galan

Asst.Prof.

Constr. Eng. Dpt.

Uni ...
  Topic: NODE values in tables
jose.galan

Replies: 8
Views: 7801

PostForum: XANSYS   Posted: Tue Jun 17, 2014 4:52 am   Subject: [Xansys] NODE values in tables
Dear Mr. Martirosyan,

In ansys the material properties can be defined at several temperatures
(see commands TBTEMP and TBDATA). At each integration points, ansys uses
the temperature at that point t ...
  Topic: Load cases for fatigue analysis
jose.galan

Replies: 8
Views: 7023

PostForum: XANSYS   Posted: Tue Jun 17, 2014 4:33 am   Subject: [Xansys] Load cases for fatigue analysis
Dear Mr. Cerullo:

the multiple load step method is valid in both linear and nonlinear
analysis.

With nonlinear problems, you will have to take into account that your
solution may not converge at s ...
  Topic: Load cases for fatigue analysis
jose.galan

Replies: 8
Views: 7023

PostForum: XANSYS   Posted: Tue Jun 17, 2014 4:20 am   Subject: [Xansys] Load cases for fatigue analysis
Dear Mr. Cerullo,

You forgot your signature again.

"Anonymous posts are not welcome on the XANSYS list. Read the Rules page
at www.xansys.org You are right Jose, I just checked the netiquette ...
  Topic: Creating areas in APDL using 'A' command
jose.galan

Replies: 6
Views: 11020

PostForum: XANSYS   Posted: Tue Jun 17, 2014 4:13 am   Subject: [Xansys] Creating areas in APDL using 'A' command
Dear Mr. Goel:

ansys provides many warning messages which are a useful feedback to the
user. They let you know that the command that you executed will run, but
with some particular behaviour. It is ...
  Topic: Load cases for fatigue analysis
jose.galan

Replies: 8
Views: 7023

PostForum: XANSYS   Posted: Mon Jun 16, 2014 5:21 pm   Subject: [Xansys] Load cases for fatigue analysis
By the way, you should follow xansys netiquette and include your full
affiliation in all your posts (http://www.xansys.org/rules.html Dear Mr. Cerullo,
if you are performing a linear static analysis ( ...
  Topic: Load cases for fatigue analysis
jose.galan

Replies: 8
Views: 7023

PostForum: XANSYS   Posted: Mon Jun 16, 2014 5:09 pm   Subject: [Xansys] Load cases for fatigue analysis
Dear Mr. Cerullo,
if you are performing a linear static analysis (antype,static), you can
define multiple load steps that will be stored in the same ansys
database by default (outres,all,all). Ansys p ...
  Topic: Creating areas in APDL using 'A' command
jose.galan

Replies: 6
Views: 11020

PostForum: XANSYS   Posted: Mon Jun 16, 2014 8:07 am   Subject: [Xansys] Creating areas in APDL using 'A' command
Dear Mr. Goel,

your coordinate system is the global cartesian coordinates.

If you read carefully the Ansys documentation on the A command, you will
find this:

"If the area is to be defined ...
  Topic: [Xansys] [APDL]Calculation of weld run
jose.galan

Replies: 15
Views: 15681

PostForum: XANSYS   Posted: Mon Jun 16, 2014 7:44 am   Subject: [Xansys] [APDL]Calculation of weld run
Dear Mr. Bouillon,

have you tried the following formula?

circunf=2*pi*radius

Before using that formula, you have to set the value of pi, either by an
APDL command

pi=4*atan(1.0)

or by provid ...
  Topic: Coulomb Damping in Forced Response
jose.galan

Replies: 3
Views: 5729

PostForum: XANSYS   Posted: Tue Jun 10, 2014 12:44 pm   Subject: [Xansys] Coulomb Damping in Forced Response
I agree with you that there are fundamental differences between dry
friction and viscous damping. Those differences are well described in
Rao's book. But you are only focusing on the free vibration ca ...
  Topic: Coulomb Damping in Forced Response
jose.galan

Replies: 3
Views: 5729

PostForum: XANSYS   Posted: Tue Jun 10, 2014 11:27 am   Subject: [Xansys] Coulomb Damping in Forced Response
Dear Mike,

in the book "Mechanical Vibrations" by Singiresu S. Rao (3rd Edition,
1995), in chapter 2.7 there is a solution of the free vibration of a 1
dof spring-mass system with dry (cou ...
  Topic: vibration (modal) analysis
jose.galan

Replies: 20
Views: 18220

PostForum: XANSYS   Posted: Tue Jun 10, 2014 8:09 am   Subject: [Xansys] vibration (modal) analysis
Dear Mehmet,

when you select an element type (for example, BEAM188 or PLANE182), you
are already defining the physics of the problem that you are solving,
the number of nodes per element, and the ty ...
  Topic: vibration (modal) analysis
jose.galan

Replies: 20
Views: 18220

PostForum: XANSYS   Posted: Tue Jun 10, 2014 7:27 am   Subject: [Xansys] vibration (modal) analysis
Dear Mehmet:

the maximum number of eigenmodes that you can calculate in any numerical
model is equal to the total number of degrees of freedom that you have.
I am sure that you have modeled a 3D can ...
  Topic: vibration (modal) analysis
jose.galan

Replies: 20
Views: 18220

PostForum: XANSYS   Posted: Tue Jun 10, 2014 7:23 am   Subject: [Xansys] vibration (modal) analysis
Dear Mehmet,

Have you compared the mode shapes corresponding to each pair of
coincident natural frequencies?

If you have a 3D beam with a doubly symmetric cross section and b.c.
with the same symm ...
  Topic: [Xansys] vibration (modal) analysis
jose.galan

Replies: 0
Views: 947

PostForum: XANSYS   Posted: Tue Jun 10, 2014 6:33 am   Subject: [Xansys] vibration (modal) analysis
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| ...
  Topic: [Xansys] vibration (modal) analysis
jose.galan

Replies: 0
Views: 989

PostForum: XANSYS   Posted: Tue Jun 10, 2014 6:18 am   Subject: [Xansys] vibration (modal) analysis
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| ...
  Topic: [APDL] Saving and resuming results from an analysis
jose.galan

Replies: 24
Views: 47123

PostForum: XANSYS   Posted: Tue Jun 10, 2014 4:44 am   Subject: [Xansys] [APDL] Saving and resuming results from an analysis
Dear Siva,

try the time-history postprocessor (/post26) instead of the general
postprocessor (/post1). It is made for what you need.

I am truly amazed that you have not found that for yourself. It ...
  Topic: NEED A ADVICE FOR NONLINEAR SOLUTIONS PROBLEMS
jose.galan

Replies: 14
Views: 15019

PostForum: XANSYS   Posted: Sun Jun 08, 2014 5:48 am   Subject: [Xansys] NEED A ADVICE FOR NONLINEAR SOLUTIONS PROBLEMS
Dear Siva,

Sheldon Imaoka has a document posted on ansys.net where he compares the
commands CERIG and RBE3. This is the link:

http://ansys.net/tips_sheldon/STI07_CERIG_RBE3_RIGID184.zip

If you r ...
  Topic: [Xansys] Fwd: Displacement control method with ARC LENGTH me
jose.galan

Replies: 1
Views: 1930

PostForum: XANSYS   Posted: Fri Jun 06, 2014 8:37 am   Subject: [Xansys] Fwd: Displacement control method with ARC LENGTH me
-------- Mensaje original --------

ASUNTO:
[Xansys] Displacement control method with ARC LENGTH method (ARCLEN)

FECHA:
06/06/2014 17:34

REMITENTE:
Balbina y Jose Ruiz-Galan <jmgalan ...
  Topic: [Xansys] Displacement control method with ARC LENGTH method
jose.galan

Replies: 0
Views: 912

PostForum: XANSYS   Posted: Fri Jun 06, 2014 8:24 am   Subject: [Xansys] Displacement control method with ARC LENGTH method
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| ...
  Topic: [Xansys] Modal - Large file size
jose.galan

Replies: 18
Views: 15093

PostForum: XANSYS   Posted: Wed May 28, 2014 11:15 am   Subject: [Xansys] Modal - Large file size
Dear Mr. Wittenschlaeger,

You may find some useful information in the following sections of the
ansys documentation:

* Ansys documentation > Mechanical APDL > Performance Guide > 4. Ansy ...
  Topic: [Xansys] Modal - Large file size
jose.galan

Replies: 18
Views: 15093

PostForum: XANSYS   Posted: Wed May 28, 2014 3:09 am   Subject: [Xansys] Modal - Large file size
Dear Mr. Wittenschlaeger,

since the .mode file is 390 MB for 6 eigenmodes, that gives 390/6=65 MB
per eigenmode. Since your model has aproximately 1 million nodes, you
can calculate the number of by ...
  Topic: Combin14 for modal analysis
jose.galan

Replies: 5
Views: 4879

PostForum: XANSYS   Posted: Tue Nov 12, 2013 6:02 am   Subject: [Xansys] Combin14 for modal analysis
For the combin14 you have used keyopt(2)=2, which means that you have a 1-D longitudinal spring-damper (with only UY degree of freedom). If your pipeline is parallel to the Y axis and is fixed in both ...
  Topic: [STRUC]pendulum to minimize displacements in the main struct
jose.galan

Replies: 38
Views: 35944

PostForum: XANSYS   Posted: Tue Jul 30, 2013 12:13 pm   Subject: [Xansys] [STRUC]pendulum to minimize displacements in the ma
Regarding my previous post, you can check the following sections of the manual:
Theory Reference | Chapter 3. Structures with Geometric Nonlinearities | 3.4. Stress StiffeningStructural Guide | Chap ...
  Topic: [STRUC]pendulum to minimize displacements in the main struct
jose.galan

Replies: 38
Views: 35944

PostForum: XANSYS   Posted: Tue Jul 30, 2013 12:09 pm   Subject: [Xansys] [STRUC]pendulum to minimize displacements in the ma
I agree with Mr. Mally.

However, the stress-stiffening (or geometric stiffening) effect can be
included
in both linear and nonlinear analysis. You can include the geometric
stiffness
matrix in your ...
  Topic: [STRUC]pendulum to minimize displacements in the main struct
jose.galan

Replies: 38
Views: 35944

PostForum: XANSYS   Posted: Tue Jul 30, 2013 3:13 am   Subject: [Xansys] [STRUC]pendulum to minimize displacements in the ma
Dear all,
I am sorry for the terrible typesetting of my previous post; I was writing from my cell phone.
Here I send you the link to the old xansys discussion about calculating the natural frequen ...
  Topic: [STRUC]pendulum to minimize displacements in the main struct
jose.galan

Replies: 38
Views: 35944

PostForum: XANSYS   Posted: Sun Jul 28, 2013 2:34 pm   Subject: [Xansys] [STRUC]pendulum to minimize displacements in the ma
By the way, have you activated Pstres,on? Link elements do not have bending stiffness unless they are prestressed (tractioned). I suggest that you solve the simple problem of your pendulum alone, hang ...
  Topic: theta angle in beam 44 real properties
jose.galan

Replies: 3
Views: 3970

PostForum: XANSYS   Posted: Fri Jul 19, 2013 5:17 am   Subject: [Xansys] theta angle in beam 44 real properties
You can rotate the tensor of inertia by hand calculations. Check Mohr's circle for a graphical method.
The 45 rotated axis are convenient because they are principal axis of inertia of the L section ...
  Topic: [WB] Importing results from static to transient structural?
jose.galan

Replies: 1
Views: 1797

PostForum: XANSYS   Posted: Sun Jul 14, 2013 2:53 am   Subject: [Xansys] [WB] Importing results from static to transient str
Dear Shervin:
FLUID30 is well suited for acoustic analysis, but I doubt that you could use it for hydrostatic analysis.
Here is one of the assumptions of FLUID30, from TFM: "The mean density ...
  Topic: [Xansys] cumulative mass fraction in modal analysis-reg
jose.galan

Replies: 2
Views: 7772

PostForum: XANSYS   Posted: Thu Jun 20, 2013 3:45 am   Subject: [Xansys] cumulative mass fraction in modal analysis-reg
Juergen's solution is a good one. You should write the /output,myOutputFile,lis right before issuing the solve command, and then add /output right after the solve command to redirect output to the ter ...
  Topic: [Xansys] Absorbing Boundary conditions
jose.galan

Replies: 0
Views: 1066

PostForum: XANSYS   Posted: Fri Feb 15, 2013 3:08 am   Subject: [Xansys] Absorbing Boundary conditions
Dear Dr. Dayal,
Ansys has absorbing boundaries for 2d and 3d acoustic problems (fluid129 and fluid 130). It also has perfectly matched layers (PML) for electromagnetic wave problems. But I think tha ...
  Topic: [FTT_SPAM] - [Xansys] [APDL NGEN command]
jose.galan

Replies: 30
Views: 18533

PostForum: XANSYS   Posted: Tue Jan 29, 2013 12:30 pm   Subject: [Xansys] [FTT_SPAM] - [APDL NGEN command]
Dear Giuseppe,
It does not matter if the nodes that you want to copy are in sequential order or not. NGEN only creates a copy of the nodes that are currently selected. Therefore, if you are able to ...
  Topic: [FTT_SPAM] - [Xansys] [APDL NGEN command]
jose.galan

Replies: 30
Views: 18533

PostForum: XANSYS   Posted: Tue Jan 29, 2013 11:32 am   Subject: [Xansys] [FTT_SPAM] - [APDL NGEN command]
In your last message you said that you have used NUMCMP command before issuing NGEN. Therefore, there are no gaps in the node numbering sequence. You could easily obtain the total number of nodes in y ...
  Topic: [APDL NGEN command]
jose.galan

Replies: 4
Views: 1801

PostForum: XANSYS   Posted: Tue Jan 29, 2013 4:48 am   Subject: [Xansys] [APDL NGEN command]
Dear Giuseppe,
have you tried the command NUMSTR? You may need to combine it with the command NUMCMP.

Regards,
Jose M. Galan
Assistant Professor
Dpt. Engineering Construction
Universidad ...
  Topic: [Xansys] Identifying an element in the mesh/ plotting in APD
jose.galan

Replies: 1
Views: 5318

PostForum: XANSYS   Posted: Wed Jan 23, 2013 8:10 am   Subject: [Xansys] Identifying an element in the mesh/ plotting in APD
Try the following commands:
ESEL,ALL
SHPP,ON,ALL
CHECK,ESEL,ERR
You can read the manual for help on SHPP and CHECK.
Best regards,

Jose M. Galan
Assistan Professor
Dept. Construction ...
  Topic: [Xansys] harmonic analysis- static pressure application
jose.galan

Replies: 7
Views: 12859

PostForum: XANSYS   Posted: Thu Sep 06, 2012 2:05 am   Subject: [Xansys] harmonic analysis- static pressure application
I have three questions:
* Does your applied static pressure produces tension or compression (in-plane stress) in the structure? If it does not, it will not produce a frequency shift because there wo ...
  Topic: [Xansys] Pre-stress Modal Analysis
jose.galan

Replies: 3
Views: 8443

PostForum: XANSYS   Posted: Wed Apr 11, 2012 6:09 am   Subject: [Xansys] Pre-stress Modal Analysis
Dear Hamid,
In a regular modal structural analysis, zero natural frequencies are associated with rigid body modes. They occur when the supports do not restrain some of the rigid body modes (or even ...
  Topic: [Xansys] R: Re: Problem with cable modelled with beam eleme
jose.galan

Replies: 1
Views: 2870

PostForum: XANSYS   Posted: Fri Jan 27, 2012 7:05 am   Subject: [Xansys] R: Re: Problem with cable modelled with beam eleme
The problem seems to be that the command INISTATE,DEFI,,,,,4260000/(9271/1e6), which should introduce an initial stress of 459MPa, works properly when using a CSOLID section, but it does not introduce ...
  Topic: [Xansys] SOLID65-Convergence problems
jose.galan

Replies: 7
Views: 11871

PostForum: XANSYS   Posted: Thu Nov 17, 2011 12:49 pm   Subject: [Xansys] SOLID65-Convergence problems
Dear Christos,
Since your simply supported beam is isostatic, the internal forces (bending moments and shear forces) can be calculated by equilibrium. The maximum bending moment, at mid-span, is equ ...
  Topic: [Xansys] SOLID65-Convergence problems
jose.galan

Replies: 7
Views: 11871

PostForum: XANSYS   Posted: Thu Nov 17, 2011 4:56 am   Subject: [Xansys] SOLID65-Convergence problems
Dear Christos,
unless there is some traction resisting element in the cross section, it is impossible to keep the equilibrium of a beam under bending. Remember that, from Navier's equations of stren ...
  Topic: [Xansys] [APDL] FEM beam example
jose.galan

Replies: 1
Views: 2907

PostForum: XANSYS   Posted: Thu Sep 29, 2011 3:27 am   Subject: [Xansys] [APDL] FEM beam example
Dear Jrgen,
The term "sliding" boundary has mislead you. In this paper the authors only consider sliding boundary conditions related to the bending deformation (see figure 2), but you hav ...
  Topic: [Xansys] Incident Acoustic Wave inside a Pipe Filled by Wate
jose.galan

Replies: 2
Views: 2037

PostForum: XANSYS   Posted: Thu Sep 03, 2009 4:47 am   Subject: [Xansys] Incident Acoustic Wave inside a Pipe Filled by Wate
Dear Alireza,
you can apply tabular loads. There are two ways of doing it: (1) define
the TABLE type array manually; this array should contain the values of
the applied pressure at several times; be ...
  Topic: [Xansys] About viscoelasticity + hyperelasticity
jose.galan

Replies: 3
Views: 4569

PostForum: XANSYS   Posted: Fri May 22, 2009 10:24 am   Subject: [Xansys] About viscoelasticity + hyperelasticity
Dear Irantzu,
With respect to the period of the excitation: after executing your macro, I obtained the UZ displacements of node 3 in the time-history postprocessor (/post26) with the following command ...
  Topic: [Xansys] About viscoelasticity + hyperelasticity
jose.galan

Replies: 3
Views: 4569

PostForum: XANSYS   Posted: Thu May 21, 2009 6:30 am   Subject: [Xansys] About viscoelasticity + hyperelasticity
Dear Irantzu,
your third material is nearly incompressible, with a poisson ratio of 0.4999 . The mixed u-P formulation is more robust (check Ansys manual) than the displacement formulation.

The varia ...
  Topic: [Xansys] EGEN command
jose.galan

Replies: 11
Views: 11809

PostForum: XANSYS   Posted: Tue Apr 07, 2009 8:25 am   Subject: [Xansys] EGEN command
Dear Irantzu,
when using the egen command, Ansys delivers a warning message "Overlapping elements will be generated due to zero node increment".
You can check with the command ELIST that ...
  Topic: [Xansys] Multiplying a vector with a matrix
jose.galan

Replies: 3
Views: 3485

PostForum: XANSYS   Posted: Thu Apr 02, 2009 5:19 am   Subject: [Xansys] Multiplying a vector with a matrix
Dear Aadith,
check the command *MOPER

You can perform matrix operations on array parameter matrices with that command.
Best regards, Jose M. Galan
Department of Construction Engineering
E ...
  Topic: [Xansys] [STRUC] Displacement in Modal analysis
jose.galan

Replies: 7
Views: 10529

PostForum: XANSYS   Posted: Thu Apr 02, 2009 3:59 am   Subject: [Xansys] [STRUC] Displacement in Modal analysis
Dear Fung,
I think that you should review the basics of vibration theory. You should be absolutely certain that a modal analysis gives you natural frequencies and mode shapes only. The eigenmode amp ...
  Topic: [Xansys] [STRUC] Displacement in Modal analysis
jose.galan

Replies: 7
Views: 10529

PostForum: XANSYS   Posted: Thu Apr 02, 2009 1:49 am   Subject: [Xansys] [STRUC] Displacement in Modal analysis
Dear Fung,

you have approximated the non-linear van der Waals forces by a linear spring. This linearization is only valid in a certain range of displacements, which is smaller than the gap betwe ...
  Topic: [Xansys] How to apply a tangential pressure in a shell?
jose.galan

Replies: 2
Views: 5479

PostForum: XANSYS   Posted: Thu Mar 26, 2009 5:33 am   Subject: [Xansys] How to apply a tangential pressure in a shell?
Dear Hervandil,
the element SURF154 is valid not only for 3D solids but also for 3D shell models. Therefore you can perfectly use it in your 3D shell models (with SHELL63, SHELL93 or SHELL181, for i ...
  Topic: [Xansys] [STRUC] Membrane with Static Pressure using Shell41
jose.galan

Replies: 2
Views: 3167

PostForum: XANSYS   Posted: Wed Mar 25, 2009 12:34 pm   Subject: [Xansys] [STRUC] Membrane with Static Pressure using Shell41
I am glad that you made it.
Were you using quadrilateral or triangular shell41 elements? If you look at "Shell41 Assumptions and Restrictions", the quadrilateral elements are not allowed ...
  Topic: [Xansys] [STRUC] Membrane with Static Pressure using Shell41
jose.galan

Replies: 2
Views: 3167

PostForum: XANSYS   Posted: Tue Mar 24, 2009 1:52 pm   Subject: [Xansys] [STRUC] Membrane with Static Pressure using Shell41
Dear Abe,
have you activated non-linear geometry effects with NLGEOM,ON? Otherwise, your
shell41 would not have any bending stiffness. Yours is a non-linear problem.
Best regards,

Jose M. Galan
Depa ...
 
Page 1 of 1
All times are GMT - 7 Hours
Jump to:  


Powered by phpBB © 2001, 2005 phpBB Group

sleek template created by Andrew Charron