XANSYS Forum Index
    Register    

FAQ    Search    Memberlist    Usergroups    SmartFeedSmartFeed    Profile    Log in
Search found 127 matches
XANSYS Forum Index
Author Message
  Topic: [Xansys] How to split selected nodes using APDL command?
ernst.hustedt

Replies: 2
Views: 5157

PostForum: XANSYS   Posted: Tue May 26, 2015 3:03 pm   Subject: [Xansys] How to split selected nodes using APDL command?
Joe,

I wrote the same thing in Oct. 1994 :),
(didn't care about temps, but included an optional xyz-shift to 'open a
crack').
One thing I remember is that ANSYS at the time did not pick up that the ...
  Topic: Using MPCHG but can't read results from precious load steps
ernst.hustedt

Replies: 1
Views: 2545

PostForum: XANSYS   Posted: Mon May 25, 2015 2:35 pm   Subject: [Xansys] Using MPCHG but can't read results from precious lo
ANSYS adds a load step result to the RST file only if the next "SOLVE"
is issued without having left SOLUTION. Leaving SOLUTION and re-entering
for another SOLVE will overwrite previous re ...
  Topic: [Xansys] [APDL]: Next available area arinqr(0,16)
ernst.hustedt

Replies: 7
Views: 6798

PostForum: XANSYS   Posted: Wed May 20, 2015 7:53 pm   Subject: [Xansys] [APDL]: Next available area arinqr(0,16)
ARINQR(0,16) called repeatedly increments the returned number by 1 every
time - that surely is odd, but why not use

a_next = ARINQR(0,14) + 1 (highest number defined + 1)

to get the next free area ...
  Topic: [Xansys] ET and REAL data lsting
ernst.hustedt

Replies: 0
Views: 2181

PostForum: XANSYS   Posted: Fri May 15, 2015 2:09 am   Subject: [Xansys] ET and REAL data lsting
Having 'inherited' a rather complex model with contacts and nonlinear
springs, I was again frustrated with the way ANSYS lists ET and R-data,
which is not very conducive to figuring out or checking ...
  Topic: Non-convergence in a large displacement solving
ernst.hustedt

Replies: 11
Views: 10464

PostForum: XANSYS   Posted: Sun Apr 12, 2015 6:41 pm   Subject: [Xansys] Non-convergence in a large displacement solving
On 11/04/2015 19:51, rongkun.wang wrote:
I'm modeling a rectangle thin foil with stretching at four edges outwards,
its normal loading consists of gravity and pressure. I would like to use
structural ...
  Topic: Automized Solution
ernst.hustedt

Replies: 4
Views: 3637

PostForum: XANSYS   Posted: Mon Mar 02, 2015 7:45 pm   Subject: [Xansys] Automized Solution - OOPS 2
On 3/03/2015 11:49, Ernst Hustedt wrote:

Well - 2nd try - I'll get it right in the end, may be not today, but it
will happen. Haven't tested it yet.


On 3/03/2015 11:38, Ernst Hustedt wrote:

f_a = ...
  Topic: Automized Solution
ernst.hustedt

Replies: 4
Views: 3637

PostForum: XANSYS   Posted: Mon Mar 02, 2015 3:49 pm   Subject: [Xansys] Automized Solution - OOPS
On 3/03/2015 11:38, Ernst Hustedt wrote:

f_a = 6000
D,ALL,ALL
DDEL,2,UY
DDel,3,UY
F,3,FY,f_a ! <== sorry for the glitch

f_b = -f_a
d_f = -1.0
*DO,i_,1,20000
f_b = f_b + d_f
SOLVE
*IF,UY( ...
  Topic: Automized Solution
ernst.hustedt

Replies: 4
Views: 3637

PostForum: XANSYS   Posted: Mon Mar 02, 2015 3:38 pm   Subject: [Xansys] Automized Solution
On 3/03/2015 02:18, ilhan.tuncoz wrote:
Dear All,

I am trying to simulate simple Mechanics of Materials problem.

Load P is applied at A, and its value is constant and known.

I am also applying cons ...
  Topic: Leaf Spring - FE vs. Analytical Results
ernst.hustedt

Replies: 12
Views: 10473

PostForum: XANSYS   Posted: Thu Feb 26, 2015 3:39 pm   Subject: [Xansys] Leaf Spring - FE vs. Analytical Results
On 27/02/2015 02:14, jajohnson@parker.com wrote:
Hi Martin,

I know you have already found your problem, but I thought I'd give you
another tip for future analysis. It sounds as if your geometry woul ...
  Topic: Leaf Spring - FE vs. Analytical Results
ernst.hustedt

Replies: 12
Views: 10473

PostForum: XANSYS   Posted: Wed Feb 25, 2015 8:10 pm   Subject: [Xansys] Leaf Spring - FE vs. Analytical Results
On 26/02/2015 15:39, Christopher Wright wrote:

On Feb 25, 2015, at 7:46 PM, Ernst Hustedt wrote:

for a rectangular strip I get

k = n*3EI/L^3 = n*E*b*t^3/(4*L^3)

if L is the half length of a symme ...
  Topic: Leaf Spring - FE vs. Analytical Results
ernst.hustedt

Replies: 12
Views: 10473

PostForum: XANSYS   Posted: Wed Feb 25, 2015 6:46 pm   Subject: [Xansys] Leaf Spring - FE vs. Analytical Results
Before anything else get the formula right:

k = (8*E*n*b*t^3)/(3*L^3) ????

for a rectangular strip I get

k = n*3EI/L^3 = n*E*b*t^3/(4*L^3)

if L is the half length of a symmetrical leaf sprin ...
  Topic: [APDL] PARSAV and PARRES - problem in using in *DO loop
ernst.hustedt

Replies: 2
Views: 4627

PostForum: XANSYS   Posted: Wed Jan 21, 2015 1:10 pm   Subject: [Xansys] [APDL] PARSAV and PARRES - problem in using in *DO
In older versions of ANSYS you could store values in
ARG1, -2, etc (up to ARG9 I think) that ANSYS still remembered after
RESUME. That has helped me a few times.

Try this to see if it still works:

...
  Topic: Ocean loading - beam188
ernst.hustedt

Replies: 8
Views: 8196

PostForum: XANSYS   Posted: Sun Jan 04, 2015 2:55 pm   Subject: [Xansys] Ocean loading - beam188
I only used transient loading and that quite a few years ago.
To get PHDYN values use the *GET for ETABLE data as I posted previously.
You better start reading the manual!

Ernst Hustedt
AMES Ltd
Chch ...
  Topic: Ocean loading - beam188
ernst.hustedt

Replies: 8
Views: 8196

PostForum: XANSYS   Posted: Tue Dec 30, 2014 1:42 pm   Subject: [Xansys] Ocean loading - beam188
It's been years that I used wave loading (PIPE59), so I would check the
ETABLE quantities thoroughly in simple examples to be sure about what
they are. May be it's PHDYN what you are after?

Would a ...
  Topic: Ocean loading - beam188
ernst.hustedt

Replies: 8
Views: 8196

PostForum: XANSYS   Posted: Mon Dec 29, 2014 10:43 pm   Subject: [Xansys] Ocean loading - beam188
On 30/12/2014 03:26, mariusz.milewski wrote:
I am working in ANSYS APDL. For the generation of wave laoding I have used
'octype,wave' command.


May be I'm way behind , but isn't wave action OCTYPE,,W ...
  Topic: difference between the commands da and d
ernst.hustedt

Replies: 4
Views: 4148

PostForum: XANSYS   Posted: Tue Dec 16, 2014 8:53 pm   Subject: [Xansys] difference between the commands da and d
While they are both constraining nodal DOFs, the D command is
unambiguous, whereas with DA there is a possibility of conflicting
specifications, if DA is used for adjacent areas. Check the DA comma ...
  Topic: [Xansys] test - isalive?
ernst.hustedt

Replies: 1
Views: 1672

PostForum: XANSYS   Posted: Mon Dec 08, 2014 3:26 am   Subject: [Xansys] test - isalive?
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| ...
  Topic: Prestressed Cable Stayed Column Buckling Analysis
ernst.hustedt

Replies: 12
Views: 10980

PostForum: XANSYS   Posted: Mon Dec 08, 2014 3:15 am   Subject: [Xansys] Prestressed Cable Stayed Column Buckling Analysis
First let me apologise for my knotted way of thinking in my first
response. I consider a buckling load to be a value that is inherent to
the stress free structure for a given set of conditions. A p ...
  Topic: Prestressed Cable Stayed Column Buckling Analysis
ernst.hustedt

Replies: 12
Views: 10980

PostForum: XANSYS   Posted: Thu Dec 04, 2014 6:39 pm   Subject: [Xansys] Prestressed Cable Stayed Column Buckling Analysis
My guess is: Why should it change, as long as the stays don't go slack
and their effect/stiffness changes? If the stays cause axial load in
the column, the working load limit changes accordingly bu ...
  Topic: [Xansys] [General] Kinematic interpretation of nodal rotatio
ernst.hustedt

Replies: 3
Views: 4767

PostForum: XANSYS   Posted: Thu Dec 04, 2014 2:42 pm   Subject: [Xansys] [General] Kinematic interpretation of nodal rotatio
Auxiliary NODES, that's what I am doing.
In BEAM to SHELL sub-modelling - cutting right at BEAM nodes - I
determine the displacements (U & ROT) to be applied for the SHELL
section from the displ ...
  Topic: [Xansys] [General] Kinematic interpretation of nodal rotatio
ernst.hustedt

Replies: 3
Views: 4767

PostForum: XANSYS   Posted: Wed Dec 03, 2014 1:57 am   Subject: [Xansys] [General] Kinematic interpretation of nodal rotatio
Peter,
Thanks for replying. I am not using WB.
It seems my approach using an auxiliary node rigidly tied to the beam
node is the easiest way to track the orientation of the beam cross
section at th ...
  Topic: [Xansys] [General] Kinematic interpretation of nodal rotati
ernst.hustedt

Replies: 0
Views: 1113

PostForum: XANSYS   Posted: Mon Dec 01, 2014 11:43 pm   Subject: [Xansys] [General] Kinematic interpretation of nodal rotati
I have been pondering how to convert ROTX,Y,Z to rotation angles for the
LOCAL command for a while. The matter is strait forward, if one rotates
a beam for example - stress free, one end hinged oth ...
  Topic: [STRUCT] Must not use character parameters in real array
ernst.hustedt

Replies: 8
Views: 11120

PostForum: XANSYS   Posted: Tue Nov 18, 2014 3:26 pm   Subject: [Xansys] [APDL] Testing variable for CHAR type
qwertyuiop - how many times have I read past that one?

Thanks, Mark


Ernst Hustedt
AMES Ltd
Chch. NZ


On 19/11/2014 04:51, Matt Sutton wrote:
Does the *get,pType,PARM,name,type not work?
Matt Sutto ...
  Topic: [STRUCT] Must not use character parameters in real array
ernst.hustedt

Replies: 8
Views: 11120

PostForum: XANSYS   Posted: Tue Nov 18, 2014 1:05 am   Subject: [Xansys] [APDL] Testing variable for CHAR type
Hi all,

Talking about character type parameter, just wondering if there is a
more elegant way to test whether or not a parameter passed to a macro is
of type CHARACTER. I have been using the _STATU ...
  Topic: [STRUCT] Must not use character parameters in real array
ernst.hustedt

Replies: 8
Views: 11120

PostForum: XANSYS   Posted: Tue Nov 18, 2014 12:32 am   Subject: [Xansys] [STRUCT] Must not use character parameters in real
Andrew,

The error message is quite clear, you have to use either CHAR or STRING
type arrays for character variables, 'ARRAY' type array is for numbers
only. To my understanding the example is incor ...
  Topic: Infinite Elements for wave propagation
ernst.hustedt

Replies: 11
Views: 15431

PostForum: XANSYS   Posted: Thu Oct 30, 2014 2:30 pm   Subject: [Xansys] Infinite Elements for wave propagation
Have a look at the spring/damper COMBIN elements. You can have more than
one attached to a node to get a combined effect. Also, may be SURF154
could work as damper/absorber for you - never used it m ...
  Topic: [APDL] Initail conditions and load/displacement ?
ernst.hustedt

Replies: 2
Views: 2468

PostForum: XANSYS   Posted: Tue Oct 21, 2014 8:14 pm   Subject: [APDL] Initail conditions and load/displacement ?
Who is this guy?

And - oh, how do you run an analysis again. Someone tell me, so I know.

EH


On 22/10/2014 15:09, anonymous wrote:
Hello everyone, is the initial condition is applied first ...
  Topic: Desigm_Modeler Issue
ernst.hustedt

Replies: 30
Views: 25624

PostForum: XANSYS   Posted: Tue Oct 21, 2014 4:18 pm   Subject: [Xansys] Desigm_Modeler Issue
One limiting factor with axisymmetric elements for me was often that
torsion and radial displacements are not coupled.

Going further off topic; supposedly another Einstein is:
"There is nothing ...
  Topic: [Xansys] OUTRES in Expansion pass
ernst.hustedt

Replies: 9
Views: 7770

PostForum: XANSYS   Posted: Thu Oct 02, 2014 2:01 am   Subject: [Xansys] OUTRES in Expansion pass
Well, one shouldn't come back to finish writing and then hit SEND
without checking the mail again first (or you look like a what?)

EH

On 2/10/2014 20:32, Martin Liddle wrote:
I think you are assumi ...
  Topic: [Xansys] OUTRES in Expansion pass
ernst.hustedt

Replies: 9
Views: 7770

PostForum: XANSYS   Posted: Thu Oct 02, 2014 1:33 am   Subject: [Xansys] OUTRES in Expansion pass
OK, there is the off chance that the default setting for your expansion
pass is OUTRES,ALL,ALL, then your OUTRES commands don't change anything.
Try OUTRES,ALL,NONE instead of OUTRES,ERASE in your s ...
  Topic: [Xansys] OUTRES in Expansion pass
ernst.hustedt

Replies: 9
Views: 7770

PostForum: XANSYS   Posted: Wed Oct 01, 2014 9:44 pm   Subject: [Xansys] OUTRES in Expansion pass
OUTRES commmand settings are accumulative!!
Always use
OUTRES,ERASE ! default setting
or
OUTRES,ALL,NONE ! no results are written
before each new setting.

Ernst Hustedt
AMES Ltd.
Chch, NZ


On 2/1 ...
  Topic: [Xansys] [STRUC] Modelling preloaded wire
ernst.hustedt

Replies: 12
Views: 12028

PostForum: XANSYS   Posted: Wed Oct 01, 2014 9:35 pm   Subject: [Xansys] [STRUC] Modelling preloaded wire
On 2/10/2014 14:50, Christopher Wright wrote:

Strictly speaking this is a non-linear problem and needs to be run for large displacements,
but you don't appear to have the chops for that. Do the pre-s ...
  Topic: [Xansys] Fwd: Re: map results/forces btwn different meshes w
ernst.hustedt

Replies: 0
Views: 1081

PostForum: XANSYS   Posted: Sun Sep 28, 2014 12:46 am   Subject: [Xansys] Fwd: Re: map results/forces btwn different meshes w
Have you tried replacing nodal TEMP results of the respective nodes with
your forces and then use BFINT or replace say nodal UX with the forces
and use CBDOF? After that extract the TEMP or UX as the ...
  Topic: [STRUC] Modal Analysis of a DrillString
ernst.hustedt

Replies: 22
Views: 20132

PostForum: XANSYS   Posted: Sun Aug 24, 2014 7:35 pm   Subject: [Xansys] [STRUC] Modal Analysis of a DrillString
On 24/08/2014 22:01, Arvin Julian Kho wrote:
I have been using BEAM188 for the beam element and COMBIN14 for the spring
element in ANSYS but the torsional modes are still not showing.

I haven't kept ...
  Topic: [Xansys] CBDOF of modal displacements - was Modal - Large fi
ernst.hustedt

Replies: 0
Views: 1437

PostForum: XANSYS   Posted: Mon Jun 09, 2014 7:14 pm   Subject: [Xansys] CBDOF of modal displacements - was Modal - Large fi
When this first came up I was kind of 'yea you can make ANSYS do almost
anything' if you know what you are doing.

Now I am a little intrigued. To my thinking, CBDOF of modal results
would only make ...
  Topic: An unexpected error (SIG$SEGV) has occurred
ernst.hustedt

Replies: 22
Views: 24304

PostForum: XANSYS   Posted: Sun Jun 08, 2014 5:14 pm   Subject: [Xansys] An unexpected error (SIG$SEGV) has occurred

Earlier it was working with the same number of substeps and same coding

Just a note of caution.
Strange things can happen when your code uses common variable names that
look like ANSYS commands or ...
  Topic: [APDL] *MWRITE command format
ernst.hustedt

Replies: 11
Views: 10969

PostForum: XANSYS   Posted: Wed Nov 27, 2013 3:27 am   Subject: [Xansys] [APDL] *MWRITE command format
Well, in my old version of ANSYS *CFW doesn't like the open bracket ( or
'(' in the first string (, is interpreted as delimiter) either. One way
out would be to use
ashish.sapre wrote:

I tried oth ...
  Topic: [APDL] *MWRITE command format
ernst.hustedt

Replies: 11
Views: 10969

PostForum: XANSYS   Posted: Wed Nov 27, 2013 3:20 am   Subject: [Xansys] [APDL] *GET,name of command file ?? --- was *MWR
Thanks Juergen,

Unfortunately I'm not into TCL/TK as I wouldn't use it often enough.

My hope is that there is a simple, undocumented way to get the name of
the file that is currently open from *CFO ...
  Topic: [APDL] *MWRITE command format
ernst.hustedt

Replies: 11
Views: 10969

PostForum: XANSYS   Posted: Tue Nov 26, 2013 9:31 pm   Subject: [Xansys] [APDL] *MWRITE command format
Allow me to join in here.
I, too, have been using this method of writing a temp command file
containing *VWRITE and *VREAD statements quite a bit in the past.

Unfortunately, as far as I am aware, yo ...
  Topic: Constraint Equation Problem
ernst.hustedt

Replies: 2
Views: 5479

PostForum: XANSYS   Posted: Sun Nov 24, 2013 2:09 pm   Subject: [Xansys] Constraint Equation Problem
If you have coupled only the z-dirn the parts can still move relative to
each other in the x-y plane. Looking at the deformed model from a
different angle you might find that to be the case. Only th ...
  Topic: [Xansys] Autoamtic deletion of elem type
ernst.hustedt

Replies: 4
Views: 3974

PostForum: XANSYS   Posted: Tue Nov 19, 2013 10:22 pm   Subject: [Xansys] Autoamtic deletion of elem type
IBD - you are right, it flags an error and then aborts the command.
I hadn't tried it before, just thought it should work the same as with
NDEL,KDEL, LDEL etc. At least now we know :)

Back to the pr ...
  Topic: [Xansys] Element face warping factor exceeds warning limit.
ernst.hustedt

Replies: 0
Views: 1925

PostForum: XANSYS   Posted: Tue Nov 19, 2013 4:59 pm   Subject: [Xansys] Element face warping factor exceeds warning limit.
In the theory manual there is a chapter (13?) on element shape testing.

Ernst Hustedt
AMES Ltd
Chch, NZ


On 20/11/2013 10:23, Scott.Carpenter@Emerson.com wrote:
Is it possible to shed some more like ...
  Topic: [Xansys] Autoamtic deletion of elem type
ernst.hustedt

Replies: 4
Views: 3974

PostForum: XANSYS   Posted: Tue Nov 19, 2013 3:45 am   Subject: [Xansys] Autoamtic deletion of elem type
Try 'ETDEL,ALL'
ANSYS shouldn't delete ETs that are used, same will apply to other
entities. Usual caution is recommended, though.

Ernst Hustedt
AMES Ltd,
Christrockingchurch, NZ


On 19/11/2013 23: ...
  Topic: [Xansys] [STRUCT] Rotational spring as a plate boundary cond
ernst.hustedt

Replies: 4
Views: 4405

PostForum: XANSYS   Posted: Sat Oct 19, 2013 5:09 pm   Subject: [Xansys] [STRUCT] Rotational spring as a plate boundary cond
Ah ja, BTW it gets even worst if you have curved edges where a nodal
CSYS at each node is useful to get the perpendicular/tangential
directions to the edge, and not just half the stiffness values at ...
  Topic: [Xansys] [STRUCT] Rotational spring as a plate boundary cond
ernst.hustedt

Replies: 4
Views: 4405

PostForum: XANSYS   Posted: Sat Oct 19, 2013 1:04 pm   Subject: [Xansys] [STRUCT] Rotational spring as a plate boundary cond
The COMBIN14 stiffnesses must be proportional to the average edge length
of the two shell elements at the edge nodes. In the worst case you end
up with as many stiffness values (REALs) as you have e ...
  Topic: [Xansys] Mesh Error Estimation
ernst.hustedt

Replies: 2
Views: 2275

PostForum: XANSYS   Posted: Tue Oct 08, 2013 3:24 pm   Subject: [Xansys] Mesh Error Estimation
Dan,
When required, my preferred way has been to calibrate a mesh by applying
individual component loads at suitable points such that the stresses at
the points of interest can be hand checked. From ...
  Topic: [Xansys] [STRUC] load
ernst.hustedt

Replies: 14
Views: 12771

PostForum: XANSYS   Posted: Wed Jul 17, 2013 1:10 pm   Subject: [Xansys] [STRUC] load
That would have been handy a few times.
Thanks

Ernst Hustedt
AMES Ltd
Chch, NZ


There is a short cut to do that:

In the second load step select the relevant nodes and then

D,ALL,UY,%_FIX%



Po ...
  Topic: [Xansys] [STRUC] load
ernst.hustedt

Replies: 14
Views: 12771

PostForum: XANSYS   Posted: Tue Jul 16, 2013 4:19 pm   Subject: [Xansys] [STRUC] load
I guess the OP wants to enforce the vertical displacement after applying
the vertical load and then apply an horizontal load, preventing any
further vertical displacement, or something like that.

W ...
  Topic: How to write a function accepting S R A U ALL as paramters ?
ernst.hustedt

Replies: 4
Views: 4165

PostForum: XANSYS   Posted: Mon Jul 08, 2013 9:30 pm   Subject: [Xansys] How to write a function accepting S R A U ALL as pa
Understandable that you don't like typing single quotes, can be a bit of
a nuisance. One alternative is to use numbers and convert them
internally e.g.
if ARG1 = 1 then TYPE = 'S'
and so on.
You cou ...
  Topic: [Xansys] *MOPER, element with the closest centroid
ernst.hustedt

Replies: 4
Views: 5963

PostForum: XANSYS   Posted: Tue Jul 02, 2013 2:28 pm   Subject: [Xansys] *MOPER, element with the closest centroid
I haven't played with this *MOPER feature, but my guess is that the
returned coordinates are the rst-location of a point inside an element
based on its shape function (check Theory Manual), i.e. the ...
  Topic: [Xansys] [APDL] - Help with using a 2d array to read an elem
ernst.hustedt

Replies: 16
Views: 14665

PostForum: XANSYS   Posted: Wed May 01, 2013 7:51 pm   Subject: [Xansys] [APDL] - Help with using a 2d array to read an elem
Sam,

Yonks ago I had a similar need to produce control prints for a rather
complex, hand steered nonlinear analysis.
I brushed up the old macro below and made it work for variable columns.
It writes ...
  Topic: ANSYS -> NASTRAN conversion
ernst.hustedt

Replies: 12
Views: 11312

PostForum: XANSYS   Posted: Tue Mar 05, 2013 2:59 pm   Subject: [Xansys] ANSYS -> NASTRAN conversion
On 6/03/2013 03:18, michael.guido wrote:
@Ernst:


Michael, why don't you chase an ANSYS to SAP input directly ?
SAP - SAPIV - what memories that brings back.


I'm not sure what you mean--I don't kno ...
  Topic: ANSYS -> NASTRAN conversion
ernst.hustedt

Replies: 12
Views: 11312

PostForum: XANSYS   Posted: Mon Mar 04, 2013 1:23 pm   Subject: [Xansys] ANSYS -> NASTRAN conversion
Michael, why don't you chase an ANSYS to SAP input directly ?
SAP - SAPIV - what memories that brings back.

Ernst Hustedt
AMES Ltd,
Christrockingchurch,
New Zealand

On 5/03/2013 07:54, michael.guido ...
  Topic: [Xansys] max plastic strain step
ernst.hustedt

Replies: 5
Views: 4803

PostForum: XANSYS   Posted: Thu Feb 14, 2013 1:04 pm   Subject: [Xansys] max plastic strain step
It depends on the material curve and the type of loading.
E.g. for elastic - (near)perfect plastic material the force
controlled loading will hardly ever work, for obvious reasons.

Ernst Hustedt
AMES ...
  Topic: [Xansys] Shell 181 and CBDOF
ernst.hustedt

Replies: 4
Views: 6670

PostForum: XANSYS   Posted: Tue Feb 05, 2013 2:15 pm   Subject: [Xansys] Shell 181 and CBDOF
On 6/02/2013 03:40, Bohlen, Dan (GE Aviation, US) wrote:

Ernst, that is the consensus on how to pull this off. Building a little test case now.
Row of shells at edge of brick model or adjusting the ...
  Topic: [Xansys] Shell 181 and CBDOF
ernst.hustedt

Replies: 4
Views: 6670

PostForum: XANSYS   Posted: Tue Feb 05, 2013 12:18 am   Subject: [Xansys] Shell 181 and CBDOF
On 5/02/2013 05:05, Bohlen, Dan (GE Aviation, US) wrote:
Anyone know what "this feature is not applicable" mean?
Like CBDOF just doesn't work with SECOFFSETS (which the global model
shells A ...
  Topic: Applying moment&shear force on user defined section SECW
ernst.hustedt

Replies: 20
Views: 18933

PostForum: XANSYS   Posted: Tue Dec 04, 2012 2:11 pm   Subject: [Xansys] Applying moment&shear force on user defined sec
On 1/12/2012 18:39, Christopher Wright wrote:

On Nov 30, 2012, at 9:57 PM, AMES wrote:

I have said this before: The fastest way of learning what ANSYS can do
is to print out the section COMMAND GROU ...
  Topic: simulation quarter of shaft
ernst.hustedt

Replies: 3
Views: 3639

PostForum: XANSYS   Posted: Tue Dec 04, 2012 11:48 am   Subject: [Xansys] simulation quarter of shaft
On 4/12/2012 23:17, Martin Liddle wrote:
On 04/12/2012 03:04, AMES wrote:
Have you considered (old school) 2D harmonic elements?

Or (new school) 2D general axisymmetric elements (SOLID272/SOLID273).
...
  Topic: simulation quarter of shaft
ernst.hustedt

Replies: 3
Views: 3639

PostForum: XANSYS   Posted: Mon Dec 03, 2012 8:04 pm   Subject: [Xansys] simulation quarter of shaft
Have you considered (old school) 2D harmonic elements?

It's been a while, but think ANSYS can show the results on a fully
expanded model. Torsion is decoupled from R and Z, though, i.e. torsion
doe ...
  Topic: Applying moment&shear force on user defined section SECW
ernst.hustedt

Replies: 20
Views: 18933

PostForum: XANSYS   Posted: Fri Nov 30, 2012 8:57 pm   Subject: [Xansys] Applying moment&shear force on user defined sec
On 1/12/2012 05:49, Christopher Wright wrote:

You can do all the load case manipulation and combination you want
with the LCCALC commands in POST1 and still preserve the original
unit load cases. RTF ...
  Topic: [Xansys] R: Stress and pressure
ernst.hustedt

Replies: 1
Views: 1958

PostForum: XANSYS   Posted: Tue Nov 13, 2012 1:55 pm   Subject: [Xansys] R: Stress and pressure
I haven't done contact problems in ANSYS for a while and I'm not
familiar with the latest features, but if I'm not mistaken, contact
conditions are based on the deformed/displaced configuration, so ...
  Topic: [Xansys] [APDL] Detach elements from rest of mesh
ernst.hustedt

Replies: 4
Views: 8032

PostForum: XANSYS   Posted: Tue Oct 02, 2012 5:21 pm   Subject: [Xansys] [APDL] Detach elements from rest of mesh
As alternative, I have an old macro that creates a crack in the model
(with xyz node offsets) was handy at the time, but you have to use
DETACH for it to work and it could be a bit slow for big mode ...
  Topic: [STRUCT] COMBIN39 spring unloading
ernst.hustedt

Replies: 1
Views: 2536

PostForum: XANSYS   Posted: Sun Sep 02, 2012 11:12 pm   Subject: [Xansys] [STRUCT] COMBIN39 spring unloading
Ashish,
May be this would work: Look at COMBIN37 which has some nonlinear stiffness capability and can be turned OFF and ON based on load step time. This way you can change the effective stiffness a ...
  Topic: [APDL]Create a mesh where KP == NODES
ernst.hustedt

Replies: 32
Views: 25895

PostForum: XANSYS   Posted: Sun Sep 02, 2012 2:51 pm   Subject: [Xansys] [APDL]Create a mesh where KP == NODES
If you would have created the mesh by hand (nodes and elements) you would be finished by now!!

If you have to do more of these some automation is quite possible since the pattern seems regular - us ...
  Topic: APDL [Structural]Fail to mesh area which contains hard point
ernst.hustedt

Replies: 19
Views: 5498

PostForum: XANSYS   Posted: Thu Aug 30, 2012 12:41 am   Subject: [Xansys] APDL [Structural]Fail to mesh area which contains h
That's about as long ago, it seems, the OP got the answer to his question.

Ernst Hustedt
AMES Ltd
Chch, NZ


On 30/08/2012 18:11, celian.collas wrote:

Cathage has been already destroyed 18 ...
  Topic: APDL [Structural]Fail to mesh area which contains hard point
ernst.hustedt

Replies: 19
Views: 5498

PostForum: XANSYS   Posted: Wed Aug 29, 2012 5:53 pm   Subject: [Xansys] APDL [Structural]Fail to mesh area which contains h
Yes - Ceterum censeo Carthaginem delendam esse

Ernst Hustedt
AMES Ltd
Chch. NZ



On 30/08/2012 12:04, giovanni.magliola wrote:

Hi experts.
So I don't resolve my mesh problem with hardpoi ...
  Topic: [Xansys] Helical threads
ernst.hustedt

Replies: 4
Views: 5111

PostForum: XANSYS   Posted: Wed Aug 29, 2012 2:46 pm   Subject: [Xansys] Helical threads
Dan,

may this helps a bit to generate the thread Hi Folks,

Some one here asked me if there was a very quick way to generate the geometry/mesh for a 360 degree brick element model with helical thr ...
  Topic: [Ansys APDL]Change a position of panel aircraft's rivets
ernst.hustedt

Replies: 1
Views: 2863

PostForum: XANSYS   Posted: Thu Aug 16, 2012 2:51 pm   Subject: [Xansys] [Ansys APDL]Change a position of panel aircraft's r
List your element types (ETLIST) and make sure that type number 4 is in fact the BEAM4 you are looking for, if not then use ESEL,S,STIF,,4 or look at the ESEL comand how to select elements by element ...
  Topic: Effect of Young's Modulus (E) in Linear Analysis
ernst.hustedt

Replies: 35
Views: 30189

PostForum: XANSYS   Posted: Tue Jul 31, 2012 5:22 pm   Subject: [Xansys] Effect of Young's Modulus (E) in Linear Analysis
Ooooahh - Sorry guys, I only got up a short while ago.

I remember that way back in my early days I had a dark second, where I too almost fell for Sig = epsi * E as a definition for stress.
It's o ...
  Topic: [Xansys] varying stiffness of spring element (COMBIN14)
ernst.hustedt

Replies: 6
Views: 6598

PostForum: XANSYS   Posted: Thu Jul 26, 2012 3:02 pm   Subject: [Xansys] varying stiffness of spring element (COMBIN14)
Be aware of the fundamental differences of the two element types, e.g. COMB14 can work in the nodal CSYS and fixed in one direction, a feature significant if NLGEO is on, whereas 180 would change dire ...
  Topic: [Xansys] Force application for a period of time
ernst.hustedt

Replies: 1
Views: 3516

PostForum: XANSYS   Posted: Thu Jul 26, 2012 2:03 am   Subject: [Xansys] Force application for a period of time
Now you are scaring the fellow with a real life scenario. Yet, that might just be what's needed to make him 'go to the library'.
I never got into this field myself, unfortunately, only touched on it ...
  Topic: [Struct] Fail to mesh area which contains hard points
ernst.hustedt

Replies: 27
Views: 18624

PostForum: XANSYS   Posted: Tue Jun 12, 2012 4:32 pm   Subject: [Xansys] [Struct] Fail to mesh area which contains hard poin
I have used hard points only once and found to have better control over the mesh, if you make areas that have the hard points as vertices, as already suggested by others. Don't waste your time trying ...
  Topic: [Struct] Fail to mesh area which contains hard points
ernst.hustedt

Replies: 27
Views: 18624

PostForum: XANSYS   Posted: Tue Jun 12, 2012 3:32 pm   Subject: [Xansys] [Struct] Fail to mesh area which contains hard poin
Mesh one of the overlapping areas, delete the other one including its KPs and LINES and copy the meshed area to the location of the deleted one. To join the copied area with its adjoining areas merge ...
  Topic: Interpolation points do not lie on selected elements
ernst.hustedt

Replies: 3
Views: 6727

PostForum: XANSYS   Posted: Wed May 09, 2012 12:41 am   Subject: [Xansys] Interpolation points do not lie on selected element
I thought you could - it's been a while that I used it. May be there is even a tolerance you can set?
End of the day for me - good luck!


On 9/05/2012 7:30 p.m., Christabel Borg wrote: Thank you ...
  Topic: Interpolation points do not lie on selected elements
ernst.hustedt

Replies: 3
Views: 6727

PostForum: XANSYS   Posted: Wed May 09, 2012 12:14 am   Subject: [Xansys] Interpolation points do not lie on selected element
Your path goes through 'air'. This is o.k if your path is through a bolt hole, for example.
Else, you may have not all elements selected or the elements and the path segments (between nodes defining ...
  Topic: [Xansys] [APDL] How to *GET values listed with PRNLD
ernst.hustedt

Replies: 3
Views: 5218

PostForum: XANSYS   Posted: Mon Apr 09, 2012 9:01 pm   Subject: [Xansys] [APDL] How to *GET values listed with PRNLD
Since I probably will need this more often right now and ANSYS does not have a command for this , here is what I have come up with. It's essentially what Mitch and Francis suggested. Note that the mac ...
  Topic: [Xansys] [APDL] How to *GET values listed with PRNLD
ernst.hustedt

Replies: 3
Views: 5218

PostForum: XANSYS   Posted: Tue Apr 03, 2012 5:01 pm   Subject: [Xansys] [APDL] How to *GET values listed with PRNLD
Mitch, thanks,

I was hoping I missed something RingTFM and tried to avoid brute force as I don't have half a day right now to code some tricks. I'll just have to go with the SMISC, 4(5) plots.

...
  Topic: [APDL] How to *GET values listed with PRNLD
ernst.hustedt

Replies: 0
Views: 1090

PostForum: XANSYS   Posted: Tue Apr 03, 2012 2:25 pm   Subject: [APDL] How to *GET values listed with PRNLD
Hello all,

In CLASSIC, I am trying to graph moment distributions along an edge of a plate (e.g. SHELL63) and can't find a way of doing that.
In the past I have converted reaction moments to force ...
  Topic: [Xansys] Surface normal vectors
ernst.hustedt

Replies: 3
Views: 4075

PostForum: XANSYS   Posted: Tue Feb 07, 2012 7:33 pm   Subject: [Xansys] Surface normal vectors
Andrew,

The GET Functions NORMNX,-Y,-Z (N1,N2,N3) are what you are after.

Ernst

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ernst H. Hustedt, ME, PhD, MIPENZ, CPEng
AMES - advanced ...
  Topic: Ansys Classic - Book Recommendations?
ernst.hustedt

Replies: 10
Views: 12410

PostForum: XANSYS   Posted: Thu Jan 19, 2012 4:01 pm   Subject: [Xansys] Ansys Classic - Book Recommendations?
My 2cts worth:
Right now I wouldn't have the time to read books about how and what others think about ANSYS.
If you are fit in FEA and to get going with Classic in a hurry - this was true years ago ...
  Topic: [mapdl] mesh refining
ernst.hustedt

Replies: 8
Views: 6189

PostForum: XANSYS   Posted: Fri Dec 30, 2011 12:31 am   Subject: [Xansys] [mapdl] mesh refining
How about you copy those elements you want to modify into a free space,
create new KPs at the copied nodes, new lines and new mesh and then copy
these elements back, merge the coincident nodes and u ...
  Topic: [mapdl] mesh refining
ernst.hustedt

Replies: 8
Views: 6189

PostForum: XANSYS   Posted: Fri Dec 30, 2011 12:30 am   Subject: [Xansys] [mapdl] mesh refining
How about you copy those elements you want to modify into a free space,
create new KPs at the copied nodes, new lines and new mesh. Then copy
these elements back, merge the coincident nodes and unse ...
  Topic: [Xansys] R: R: Inertia relief considered
ernst.hustedt

Replies: 4
Views: 4506

PostForum: XANSYS   Posted: Wed Dec 21, 2011 2:19 pm   Subject: [Xansys] R: R: Inertia relief considered
Riccardo,

Now, that's intriguing, could you add me to the list, please.

solved@ames.co.nz

It's not just a fancy way of load case combinations, is it.
Transfer functions take me back to the 70ties a ...
  Topic: [Xansys] R: R: Inertia relief and submodels - addendum
ernst.hustedt

Replies: 8
Views: 9790

PostForum: XANSYS   Posted: Tue Dec 20, 2011 1:00 am   Subject: [Xansys] R: R: Inertia relief and submodels - addendum
On 20/12/2011 09:28, AMES wrote:
Keith's suggestion would only work if the submodel has
the same nodes as the original (coarse) model to apply the
accelerations, which is usually not the case.

Well, ...
  Topic: [Xansys] R: R: Inertia relief and submodels - addendum
ernst.hustedt

Replies: 8
Views: 9790

PostForum: XANSYS   Posted: Mon Dec 19, 2011 1:28 pm   Subject: [Xansys] R: R: Inertia relief and submodels - addendum
I have never used inertia relief myself but I have done plenty of
sub-modelling. Keith's suggestion would only work if the submodel has
the same nodes as the original (coarse) model to apply the
ac ...
  Topic: Can't get a coil spring to converge with proper coil contact
ernst.hustedt

Replies: 18
Views: 12448

PostForum: XANSYS   Posted: Mon Dec 12, 2011 2:38 pm   Subject: [Xansys] Can't get a coil spring to converge with proper coi
On 13/12/2011 10:09, Chuck Ritter wrote:
was a numerical issue. The real world instablity - if any - didn't
lead to a collapse or failure so nature was doing a better job than
FEA. Surprise.

Yea, g ...
  Topic: Can't get a coil spring to converge with proper coil contact
ernst.hustedt

Replies: 18
Views: 12448

PostForum: XANSYS   Posted: Mon Dec 12, 2011 1:24 pm   Subject: [Xansys] Can't get a coil spring to converge with proper coi
Some of the complex contact problems can be solved by simply carrying on
after an non-converged solution; with caution, naturally. Increasing the
time step has helped as well to 'step over' the stic ...
  Topic: Can't get a coil spring to converge with proper coil contact
ernst.hustedt

Replies: 18
Views: 12448

PostForum: XANSYS   Posted: Wed Dec 07, 2011 11:08 pm   Subject: [Xansys] Can't get a coil spring to converge with proper coi
Well, I'm not familiar with the jargon, and what do you mean with variable rate - not constant along the spring? Is that why the coils are bound up at one end and not equally spaced, or is it an itera ...
  Topic: Can't get a coil spring to converge with proper coil contact
ernst.hustedt

Replies: 18
Views: 12448

PostForum: XANSYS   Posted: Wed Dec 07, 2011 7:45 pm   Subject: [Xansys] Can't get a coil spring to converge with proper coi
Jeff,

Sounds to me the coil is becoming unstable and wants to bulge out. The
radical test would be to guide the spring to see if that makes it
converge. Friction would stabilize it, too , up to a p ...
  Topic: [Xansys] [OT] Problems in measuring stresses in ANSYS
ernst.hustedt

Replies: 2
Views: 2951

PostForum: XANSYS   Posted: Wed Dec 07, 2011 1:40 am   Subject: [Xansys] [OT] Problems in measuring stresses in ANSYS
Ops - "kinematic" of course, but then that's not a noun, what a shame.

EH

On 7/12/2011 21:31, AMES wrote:
Goodonya mait - but we wouldn't want too many engineers looking for a
job either. ...
  Topic: [Xansys] [OT] Problems in measuring stresses in ANSYS
ernst.hustedt

Replies: 2
Views: 2951

PostForum: XANSYS   Posted: Wed Dec 07, 2011 1:31 am   Subject: [Xansys] [OT] Problems in measuring stresses in ANSYS
Goodonya mait - but we wouldn't want too many engineers looking for a
job either.

Actually, going way back too now, as engineering student towards the end
when I needed some dosh I taught youngster ...
  Topic: [Xansys] Problems in measuring stresses in ANSYS
ernst.hustedt

Replies: 3
Views: 3353

PostForum: XANSYS   Posted: Tue Dec 06, 2011 2:50 am   Subject: [Xansys] Problems in measuring stresses in ANSYS
Remember that shell stress resultants are per unit length! That's
pretty
standard! See the element stress output of the element in the element
manual or theory manual CH 2.3.3 for more details.
I thin ...
  Topic: [Xansys] Problems in measuring stresses in ANSYS
ernst.hustedt

Replies: 3
Views: 3353

PostForum: XANSYS   Posted: Mon Dec 05, 2011 8:22 pm   Subject: [Xansys] Problems in measuring stresses in ANSYS
Thareek,

Remember that shell stress resultants are per unit length! That's pretty
standard! See the element stress output of the element in the element
manual or theory manual CH 2.3.3 for more det ...
  Topic: Cold Working In Ansys
ernst.hustedt

Replies: 21
Views: 12488

PostForum: XANSYS   Posted: Sun Nov 27, 2011 11:32 pm   Subject: [Xansys] Cold Working In Ansys
Hi Habib,

I am not familiar with your University, and I won't google it, but
somehow I wonder if you are doing an Arts degree and just after a pretty
picture :).

What are the reasons for doing thi ...
  Topic: Cold Working In Ansys
ernst.hustedt

Replies: 21
Views: 12488

PostForum: XANSYS   Posted: Tue Nov 22, 2011 2:44 pm   Subject: [Xansys] Cold Working In Ansys
Apology accepted!
If you are using WB I am not the person to ask.
In classic or what ever you call it, there is the NSEL command.
In any case, it seems to me you better go through some tutorials!!

Er ...
  Topic: Cold Working In Ansys
ernst.hustedt

Replies: 21
Views: 12488

PostForum: XANSYS   Posted: Tue Nov 22, 2011 1:10 pm   Subject: [Xansys] Cold Working In Ansys
Don't write to list members directly!!

Read up on basic modelling and coordinate systems in TFM!!

Don't try and run two load cases straight off, if you haven't verified
what happens in the first, i ...
  Topic: Cold Working In Ansys
ernst.hustedt

Replies: 21
Views: 12488

PostForum: XANSYS   Posted: Sat Nov 19, 2011 5:50 pm   Subject: [Xansys] Cold Working In Ansys
Since the question was relating to a hole, it's cold working/expanding
a fastener hole to improve fatigue performance, widely used in aircraft.
There is some info on that and a nice video of the pr ...
  Topic: Cold Working In Ansys
ernst.hustedt

Replies: 21
Views: 12488

PostForum: XANSYS   Posted: Fri Nov 18, 2011 3:27 am   Subject: [Xansys] Cold Working In Ansys
Create a cylindrical CSYS in the hole centre, apply radial (UX)
displacements to widen the hole in the 1st step and then DELETE these UX
in the second load step. This abrupt unloading can be problem ...
  Topic: Interpreting yield point in MISO material model
ernst.hustedt

Replies: 3
Views: 3587

PostForum: XANSYS   Posted: Tue Nov 01, 2011 5:45 pm   Subject: [Xansys] Interpreting yield point in MISO material model
Here we go, replying to my own email.
I haven't done plastic analyses for a while. Just curious to hear if
someone has modeled material including upper and lower yield point in ANSYS.
Cheers
Ernst Hu ...
  Topic: Interpreting yield point in MISO material model
ernst.hustedt

Replies: 3
Views: 3587

PostForum: XANSYS   Posted: Tue Nov 01, 2011 5:02 pm   Subject: [Xansys] Interpreting yield point in MISO material model
According to the manual, the first slope (0,0 to first point) in the MISO curve should be the same as the elastic modulus, which means the first point defines the proportional limit (start of plastic ...
  Topic: [Xansys] [General] Animation software.
ernst.hustedt

Replies: 16
Views: 23651

PostForum: XANSYS   Posted: Mon Oct 17, 2011 2:13 pm   Subject: [Xansys] [General] Animation software.
Joe,
Just a thought, I vaguely remember something that although ANSYS didn't
show all frames, depending on size, they were actually all in the avi
file. That was in 7.0 but the macro may still be th ...
  Topic: [Xansys] [General] Animation software.
ernst.hustedt

Replies: 16
Views: 23651

PostForum: XANSYS   Posted: Mon Oct 17, 2011 2:13 pm   Subject: [Xansys] [General] Animation software.
Joe,
Just a thought, I vaguely remember that although ANSYS didn't show all
frames, depending on size, they were actually all in the avi file. That
was in 7.0 but the macro may still be the same.

E ...
  Topic: warning -''equation solver pivot''?
ernst.hustedt

Replies: 4
Views: 44426

PostForum: XANSYS   Posted: Wed Oct 05, 2011 6:03 pm   Subject: [Xansys] warning -'equation solver pivot'?
I haven't got your initial email anymore, but just a thought: If the
warning does not give you the DOF that causes it, you could make ANSYS
use a direct solver (BAND), which should give you the DOF. ...
  Topic: how to undo 'merge nodes' command
ernst.hustedt

Replies: 7
Views: 10315

PostForum: XANSYS   Posted: Tue Sep 27, 2011 3:45 pm   Subject: [Xansys] how to undo 'merge nodes' command
I just remembered that I have an old macro (1994) to put a 'crack' into
a model separating selected elements at selected nodes. Happy to share
it as is. It's more flexible but downside is that it re ...
  Topic: [Xansys] [Struc] Stress linearization (pressure vessel)
ernst.hustedt

Replies: 1
Views: 3849

PostForum: XANSYS   Posted: Tue Aug 16, 2011 3:06 am   Subject: [Xansys] [Struc] Stress linearization (pressure vessel)
Agree, but again, these commands perform a stress linearization on a path. In a 2D axisymmetric model a path represents a surface. Membrane stress is the average stress, normal to that very surface.
N ...
  Topic: Static Structural Simulation Help
ernst.hustedt

Replies: 5
Views: 4879

PostForum: XANSYS   Posted: Tue Aug 09, 2011 2:53 pm   Subject: [Xansys] Static Structural Simulation Help
Jonathan,

The problem is hardly axisymetric, but depending what you are after it
can be reduced to 2D, if the tube is in a plane. If you only what to see
the rod fully inside the tube and the end y ...
  Topic: frictionless contact: Near open status enquiry
ernst.hustedt

Replies: 10
Views: 15344

PostForum: XANSYS   Posted: Mon Aug 08, 2011 2:32 pm   Subject: [Xansys] frictionless contact: Near open status enquiry
The contact definitions sounds OK to me. To get contact of a bolt with
the inside of the bolt hole is quite possible and depends on the
geometry, mainly the bolt - hole clearances, flange thickness ...
  Topic: frictionless contact: Near open status enquiry
ernst.hustedt

Replies: 10
Views: 15344

PostForum: XANSYS   Posted: Sun Aug 07, 2011 4:28 pm   Subject: [Xansys] R: frictionless contact: Near open status enquiry
The way I read it was that the frictionless contact is between the
threaded part or the shank of the bolt and the inside of the hole. I
don't think we are talking about the flanks of the threads eng ...
  Topic: frictionless contact: Near open status enquiry
ernst.hustedt

Replies: 10
Views: 15344

PostForum: XANSYS   Posted: Sun Aug 07, 2011 2:15 pm   Subject: [Xansys] R: frictionless contact: Near open status enquiry
Li,
Assuming your model is ok otherwise, the analysis tells you that either
the pre-tension is too low or the applied shear load in the interface is
larger than mu*F (friction coeff x bolt force), ...
  Topic: Centrifugal Analysis Validation
ernst.hustedt

Replies: 8
Views: 8130

PostForum: XANSYS   Posted: Tue Aug 02, 2011 3:46 am   Subject: [Xansys] Centrifugal Analysis Validation
I guess the RSYS has to be cylindrical to sum the radial (x) reaction
forces correctly

Ernst Hustedt
AMES Ltd
Chch, NZ

On 2/08/2011 20:27, surendren.balasubramanian@pricoltech.com wrote:
Karthik

Y ...
  Topic: [Xansys] Radial constraint for concentric cylinders press fi
ernst.hustedt

Replies: 6
Views: 8927

PostForum: XANSYS   Posted: Fri Jul 01, 2011 4:10 pm   Subject: [Xansys] Radial constraint for concentric cylinders press fi
Or even simpler:
The circumference of a ring is U = 2 PI R.
To increase its radius you have to stretch it,
or if you shrink it, the radius gets smaller. But I guess you knew that :)

Also worth doing ...
  Topic: [Xansys] Radial constraint for concentric cylinders press fi
ernst.hustedt

Replies: 6
Views: 8927

PostForum: XANSYS   Posted: Fri Jul 01, 2011 1:48 am   Subject: [Xansys] Radial constraint for concentric cylinders press fi
I forgot one thing though: It's a good idea to radially constrain any
nodes on the z-axis as they shouldn't move, prevents small erroneous
radial displacements possible due to numerical dirt.

Ernst ...
  Topic: [Xansys] Radial constraint for concentric cylinders press fi
ernst.hustedt

Replies: 6
Views: 8927

PostForum: XANSYS   Posted: Fri Jul 01, 2011 1:31 am   Subject: [Xansys] Radial constraint for concentric cylinders press fi
Aadith,

You don't need any radial constraints at all, as the tangential
constraints automatically prevent free radial displacement.
Check that your tangential constraints are actually tangential and ...
  Topic: [Xansys] [OTHER] [APDL] asymmetric constraints
ernst.hustedt

Replies: 4
Views: 4998

PostForum: XANSYS   Posted: Wed Jun 29, 2011 3:03 pm   Subject: [Xansys] [OTHER] [APDL] asymmetric constraints
Luisier,

It seems you are doing all you can do without running a type of contact analysis.
My suggestion was that the contact analysis may be fast enough for you, if you reduce the problem by t ...
  Topic: [Xansys] [OTHER] [APDL] asymmetric constraints
ernst.hustedt

Replies: 4
Views: 4998

PostForum: XANSYS   Posted: Sat Jun 25, 2011 2:23 am   Subject: [Xansys] [OTHER] [APDL] asymmetric constraints
Luisier,

Sorry for butting in here, but I am a bit puzzled by this and curious.

Thinking aloud: A 3 point bending test is essentially a 2-D arrangement or at least implies symmetry. From wh ...
  Topic: Postprocessing cross-section average stress value
ernst.hustedt

Replies: 2
Views: 4787

PostForum: XANSYS   Posted: Wed Jun 01, 2011 1:19 am   Subject: [Xansys] Postprocessing cross-section average stress value
On 31/05/2011 23:30, xansys05@tynecomp.co.uk wrote:
> On 31/05/2011 11:47, zhang.li wrote:
>> i would like to extract the average hoop stress at the cross section area of a cylinder, to estim ...
  Topic: [General] I need a good book
ernst.hustedt

Replies: 13
Views: 9072

PostForum: XANSYS   Posted: Mon May 16, 2011 2:11 pm   Subject: [Xansys] [General] I need a good book
And then again, for a lot of us, hardly a day goes by where we don't reach for the R&Y. I for a start don't even try and memorize the equations for load cases. But all within reason, all the equat ...
  Topic: [Xansys] Component Mode Synthesis Hand Calculation
ernst.hustedt

Replies: 19
Views: 23151

PostForum: XANSYS   Posted: Sun May 15, 2011 7:49 pm   Subject: [Xansys] Component Mode Synthesis Hand Calculation
Gustqavo,
I have never used the method myself, but I know the concept from modal analysis. D.J. Ewins' book (1985) "Modal Testing" shows an example and I recall the chapter "Presentat ...
  Topic: Tapered section shell181 vs shell281
ernst.hustedt

Replies: 9
Views: 21509

PostForum: XANSYS   Posted: Thu Apr 14, 2011 2:53 am   Subject: [Xansys] Tapered section shell181 vs shell281
One other thought: Check the section number of the 181 shell. If it's a
valid/existing section number 181 it used to ignore the REAL data. You
may get away with giving the 181 elements a non exist ...
  Topic: [Xansys] Reaction forces in nonlinear solution
ernst.hustedt

Replies: 6
Views: 9802

PostForum: XANSYS   Posted: Mon Apr 04, 2011 1:08 am   Subject: [Xansys] Reaction forces in nonlinear solution
Eshan,

It's up to you, what ever does the job with the least effort.

The macro as it is only gives you the sum of one reaction component at
the time, RX,RY,RZ, MX,MY or MZ, which is stored in ...
  Topic: [Xansys] Reaction forces in nonlinear solution
ernst.hustedt

Replies: 6
Views: 9802

PostForum: XANSYS   Posted: Thu Mar 31, 2011 3:18 am   Subject: [Xansys] Reaction forces in nonlinear solution
In POST26 you can graph reaction components for single nodes, but I
don't think you can graph total reactions straight-off.

I needed something like that once, so here is an ancient macro (as is ...
  Topic: Modeling a hook in ANSYS
ernst.hustedt

Replies: 16
Views: 17446

PostForum: XANSYS   Posted: Wed Mar 30, 2011 7:33 pm   Subject: [Xansys] [OT] Modeling a hook in ANSYS
Replying to my own post -
According to 'The Unofficial History of ANSYS' my first contact with
ANSYS must have been after Peter Kohnke joined ANSYS at the beginning of
73, as very early on I atte ...
  Topic: Modeling a hook in ANSYS
ernst.hustedt

Replies: 16
Views: 17446

PostForum: XANSYS   Posted: Wed Mar 30, 2011 7:15 pm   Subject: [Xansys] [OT] Modeling a hook in ANSYS
It might have been a bit later, and probably around 75 I installed ANSYS
on the RWTH IME computer(PRIME). May be it was even rev. 1.2, the 2 is
somehow stuck in my mind. I never kept a diary then. ...
  Topic: Modeling a hook in ANSYS
ernst.hustedt

Replies: 16
Views: 17446

PostForum: XANSYS   Posted: Wed Mar 30, 2011 3:31 pm   Subject: [Xansys] Modeling a hook in ANSYS
I can't suggest an element in ANSYS to simulate this without trying it
out myself. If the wire is not affecting the stress/deformation in the
block, ignore it in the model and calculate the wire t ...
  Topic: Modeling a hook in ANSYS
ernst.hustedt

Replies: 16
Views: 17446

PostForum: XANSYS   Posted: Wed Mar 30, 2011 1:31 pm   Subject: [Xansys] Modeling a hook in ANSYS
No Forces? Surely, you must have a load of some sort. That you can't
hand calculate the force in the wire, including the change in geometry
due to stretch if needed, seems unlikely. If you are aft ...
  Topic: Modeling a hook in ANSYS
ernst.hustedt

Replies: 16
Views: 17446

PostForum: XANSYS   Posted: Tue Mar 29, 2011 10:47 pm   Subject: [Xansys] Modeling a hook in ANSYS
I can't quite picture your model, but it seems you trying to simulate a
pulley type arrangement (a continuous wire changing direction at the
corners). How about applying forces based on simple mec ...
  Topic: [Xansys] [XANSYS] STRUCT - Plastic analysis with zero tangen
ernst.hustedt

Replies: 1
Views: 1853

PostForum: XANSYS   Posted: Mon Mar 21, 2011 10:25 pm   Subject: [Xansys] [XANSYS] STRUCT - Plastic analysis with zero tangen
I can't quite recall how ANSYS does it, but if I am not mistaken plastic
calculations are based on element stresses.
When extrapolated to nodes stresses can be higher there.
Just a thought.

Reg ...
 
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