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  Topic: LINK 180 - solver pivot
david.gross

Replies: 7
Views: 12933

PostForum: XANSYS   Posted: Thu Dec 11, 2014 6:44 am   Subject: [Xansys] LINK 180 - solver pivot
Mariusz,

Since you seem to be at wits end trying to find the rigid body mode, try performing a modal analysis of your geometry and look to see which part flies off, and in what direction.

Regards,

...
  Topic: [APDL] [STRUC] Consecutive static analyses
david.gross

Replies: 10
Views: 12469

PostForum: XANSYS   Posted: Thu Oct 16, 2014 1:59 pm   Subject: [Xansys] [APDL] [STRUC] Consecutive static analyses
Kerry,

I have successfully done exactly what you describe, so maybe you aren't doing the restart correctly. Are you using singleframe or multiframe restart? Personally, I have always thought that m ...
  Topic: Total load at boundary condition -> misunderstanding
david.gross

Replies: 1
Views: 2476

PostForum: XANSYS   Posted: Tue Oct 14, 2014 2:32 pm   Subject: [Xansys] Total load at boundary condition -> misunderstan
Alexandre,

I'm not sure I fully understand what you are looking at. However, let me make the general statement that you should not expect reaction forces from seismic analyses to add to something se ...
  Topic: map results/forces btwn different meshes w/ interpolation
david.gross

Replies: 4
Views: 5825

PostForum: XANSYS   Posted: Mon Sep 15, 2014 4:17 pm   Subject: [Xansys] map results/forces btwn different meshes w/ interpo
Mr. Kang,

Take a look at the *MOPER command, using Oper = MAP. If you can express your body forces as an array with corresponding coordinates, this command should be able to do a 3D interpolation fo ...
  Topic: [Xansys] MISC: CAESAR II
david.gross

Replies: 13
Views: 13054

PostForum: XANSYS   Posted: Thu Jul 10, 2014 11:10 am   Subject: [Xansys] MISC: CAESAR II
Chris,

Those piping commands still exist in APDL, and are quite convenient for defining a piping run geometry in ANSYS. In the Release 11.0 documentation I keep on my PC, they can be found in Table ...
  Topic: [Xansys] MISC: CAESAR II
david.gross

Replies: 13
Views: 13054

PostForum: XANSYS   Posted: Thu Jul 10, 2014 7:24 am   Subject: [Xansys] MISC: CAESAR II
Rick,

My experience with CAESAR II has always been building a model of an existing facility, working from hard-copy drawings. From there, I made up a node numbering system and keyed in the element d ...
  Topic: [Xansys] MISC: CAESAR II
david.gross

Replies: 13
Views: 13054

PostForum: XANSYS   Posted: Thu Jul 10, 2014 6:15 am   Subject: [Xansys] MISC: CAESAR II
I do, from about 10+ years ago. What did you want to know?

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of F ...
  Topic: vibration (modal) analysis
david.gross

Replies: 20
Views: 19192

PostForum: XANSYS   Posted: Tue Jun 10, 2014 6:18 am   Subject: [Xansys] vibration (modal) analysis
Dear Mehmet,

This appears to be basic modal analysis of what I'm going to guess is a symmetric 3-D structure, such as a round pipe or a square cross-section. In that case, "repeated modes" ...
  Topic: [APDL] Saving and resuming results from an analysis
david.gross

Replies: 24
Views: 49063

PostForum: XANSYS   Posted: Fri Jun 06, 2014 2:49 pm   Subject: [Xansys] [APDL] Saving and resuming results from an analysis
Kerry,

Very similar to what Dean just said, we have actually kicked this around in our shop, and have developed the following guidelines for archiving analyses performed in MAPDL, and the guidance in ...
  Topic: [Xansys] Modal - Large file size
david.gross

Replies: 18
Views: 15954

PostForum: XANSYS   Posted: Thu May 29, 2014 7:30 am   Subject: [Xansys] Modal - Large file size
All,

You guys are bringing back "fond" memories for me. I was working as an intern at in the central engineering department of a very large company. The year was 1988, the ANSYS version w ...
  Topic: [Xansys] [APDL] Transient analysis after static analysis as
david.gross

Replies: 0
Views: 942

PostForum: XANSYS   Posted: Fri May 23, 2014 2:02 pm   Subject: [Xansys] [APDL] Transient analysis after static analysis as
Dr. Yang,

I only skimmed your question, but one thing you should think about is this. When you're trying to set up initial conditions for a transient analysis, you need to concern yourself with both ...
  Topic: [Xansys] Experience with SOLSH190...
david.gross

Replies: 10
Views: 12070

PostForum: XANSYS   Posted: Fri May 16, 2014 2:38 pm   Subject: [Xansys] Experience with SOLSH190...
Jim/Dan,

Not much help here, either, but I recall at least entertaining the use of these elements when we wanted to vary shell thickness via actual geometry (i.e., 3D solid model) rather than via rea ...
  Topic: [Xansys] ASME codes
david.gross

Replies: 20
Views: 14896

PostForum: XANSYS   Posted: Fri Jan 31, 2014 1:58 pm   Subject: [Xansys] ASME codes
All,

I can confirm that this is correct, although I believe Section III has yet to adopt the new content that came into Section VIII, Div. 2 in the 2010 edition (the Part 5 content that has been disc ...
  Topic: [APDL] to generate a output file with BC etc. information
david.gross

Replies: 4
Views: 4692

PostForum: XANSYS   Posted: Thu Jan 23, 2014 8:17 am   Subject: [Xansys] [APDL] to generate a output file with BC etc. infor
Jiacheng,

It may be more than you want, but take a look at the CDWRITE command. You could do CDWRITE,ALL and get everything, or look into some of the command options to pare this down a bit.

Regard ...
  Topic: Shell-Solid Connection and thermal growth
david.gross

Replies: 14
Views: 14114

PostForum: XANSYS   Posted: Mon Jan 20, 2014 3:07 pm   Subject: [Xansys] Shell-Solid Connection and thermal growth
Alexandre,

+2 perhaps to what these guys are saying, but I want to underscore a bit of advice that I believe you got on this thread but may not have understood the significance of. Accordingly, I wa ...
  Topic: [Xansys] Minimum/maximum stiffness value
david.gross

Replies: 9
Views: 10510

PostForum: XANSYS   Posted: Tue Dec 17, 2013 11:17 am   Subject: [Xansys] Minimum/maximum stiffness value
O-rings, for example, have no stiffness at all, while materials like Monel, used in standard ring joint facings, will likely be close to the maximum model stiffness.

Be careful with that, too. I've ...
  Topic: [struc] What kind of error is this ?
david.gross

Replies: 7
Views: 9519

PostForum: XANSYS   Posted: Wed Nov 20, 2013 8:15 am   Subject: [Xansys] R: R: [struc] What kind of error is this ?
Riccardo,

You need to keep in mind that, based on who the OP is, this is a very likely a welding analysis. It is not at all uncommon for the first step of a welding analysis to start off at the refe ...
  Topic: [Xansys] R: R: Steady state response of fan motor mounting b
david.gross

Replies: 0
Views: 896

PostForum: XANSYS   Posted: Mon Oct 21, 2013 5:30 am   Subject: [Xansys] R: R: Steady state response of fan motor mounting b
Chris,

This was back in the ANSYS 4.3 days -- i.e., with SASI and yellow three-ring binders. Everyone was doing it back then...

Besides, I think the statute of limitations has run on that transgres ...
  Topic: [Xansys] R: R: Steady state response of fan motor mounting b
david.gross

Replies: 0
Views: 1112

PostForum: XANSYS   Posted: Thu Oct 17, 2013 6:49 am   Subject: [Xansys] R: R: Steady state response of fan motor mounting b
Chris,

Of course you generally correct, as usual. My experience is 25-years old, using a state-of-the-art Intel 386 computer (with math coprocessor, of course) and a cutting-edge product called &qu ...
  Topic: [Xansys] R: R: Steady state response of fan motor mounting b
david.gross

Replies: 1
Views: 1626

PostForum: XANSYS   Posted: Wed Oct 16, 2013 11:38 am   Subject: [Xansys] R: R: Steady state response of fan motor mounting b
Chris,

Back in my day, the search term was "experimental modal analysis" (EMA). D. J. Ewins wrote a nice textbook on the subject, as one example I recall.

Regards,

David Gross
Dominion E ...
  Topic: [Xansys] Retrieve information from an excel file using ADPL
david.gross

Replies: 2
Views: 3302

PostForum: XANSYS   Posted: Tue Jun 04, 2013 12:15 pm   Subject: [Xansys] Retrieve information from an excel file using ADPL
Matthew,

I've done something like this to create parametric analyses of pipe schedules, for example. I did it manually by writing ARRAY commands in Excel and then pasting them as text into my batch ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 10:14 pm   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: Harmonic Analysis of a Piezo multi-layer transducer (Wb14)
david.gross

Replies: 48
Views: 52747

PostForum: XANSYS   Posted: Mon Mar 18, 2013 6:23 am   Subject: [Xansys] Harmonic Analysis of a Piezo multi-layer transducer
Nima,

I suspect this is all new to you and you feel overwhelmed, but you really
must try harder to figure out simple things like this on your own. However,
I'm 95% sure I know what's going on in thi ...
  Topic: how to calculate stresses on selected nodes
david.gross

Replies: 9
Views: 7327

PostForum: XANSYS   Posted: Thu Mar 14, 2013 10:45 am   Subject: [Xansys] how to calculate stresses on selected nodes
All,

This is a very curious case. I, not doubt similar to Dan, generally read
the list via the mailman interface. Hugo's signature definitely didn't come
through on the mailman version of this mess ...
  Topic: load application
david.gross

Replies: 4
Views: 5461

PostForum: XANSYS   Posted: Thu Feb 28, 2013 3:20 pm   Subject: [Xansys] load application
Word to the wise,

Find a way to get your signature on your post.

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@x ...
  Topic: 3D Joule Heating
david.gross

Replies: 5
Views: 5248

PostForum: XANSYS   Posted: Thu Feb 28, 2013 11:03 am   Subject: [Xansys] 3D Joule Heating
Martin,

Does Rob win a prize for being the 1 millionth customer to receive this
admonishment? Sounds like a big milestone!

Regards,

David "I'd better remember to sign this snarky comment" ...
  Topic: Thermal-structural analysis in welding
david.gross

Replies: 7
Views: 6613

PostForum: XANSYS   Posted: Tue Feb 26, 2013 11:05 am   Subject: [Xansys] Thermal-structural analysis in welding
Atanu,

Yes, you can do what you said, if that's really what you want to do. You
could, for example, make a list of nodes that exceed liquidus temperature
corresponding to a given time in the thermal ...
  Topic: Workbench Cyclic Time Problem
david.gross

Replies: 4
Views: 3884

PostForum: XANSYS   Posted: Fri Feb 22, 2013 10:19 am   Subject: [Xansys] Workbench Cyclic Time Problem
Dan,

He didn't say that he got *rid* of half the model, just that he cut it. I'm
just kidding here... kinda...

Oh it must be Friday.

Regards,

David Gross
Dominion Engineering, Inc.

-----Original ...
  Topic: [Xansys] [STRUC] [APDL] Boundary condition problem
david.gross

Replies: 1
Views: 6865

PostForum: XANSYS   Posted: Wed Feb 20, 2013 8:24 am   Subject: [Xansys] [STRUC] [APDL] Boundary condition problem
Berkan,

Standard advice is as follows:

1. Think through your boundary conditions and ensure that all six rigid
body DOFs of the structure are properly constrained, but not
over-constrained. You se ...
  Topic: [Xansys] RES: Post-buckling behavior in shells
david.gross

Replies: 2
Views: 2650

PostForum: XANSYS   Posted: Sat Feb 16, 2013 12:49 pm   Subject: [Xansys] RES: Post-buckling behavior in shells
Chris,

For what it's worth, your argument makes sense to me. I don't have data to
confirm or deny your point. But if you have access to the following (which
I don't at this moment):

Harvey, J. F., ...
  Topic: Copy pressure load after esym command
david.gross

Replies: 5
Views: 5299

PostForum: XANSYS   Posted: Fri Feb 15, 2013 2:20 pm   Subject: [Xansys] Copy pressure load after esym command
Keith,

Well played, sir! I'm impressed.

Regards,

David Gross
Dominion Engineering, Inc.


-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of ...
  Topic: Copy pressure load after esym command
david.gross

Replies: 5
Views: 5299

PostForum: XANSYS   Posted: Fri Feb 15, 2013 2:11 pm   Subject: [Xansys] Copy pressure load after esym command
Luke,

I did a little searching through the manual and wasn't able to find a single
magic command to do this, and was frankly a bit surprised. So, on to plan B
--

Depending on what you're looking at ...
  Topic: ANSYS APDL read/write XML file example
david.gross

Replies: 9
Views: 15884

PostForum: XANSYS   Posted: Fri Feb 15, 2013 10:14 am   Subject: [Xansys] ANSYS APDL read/write XML file example
Jiazhu,

Please don't pose your entire question in the subject. Please do tell us
more about what you're trying to accomplish and why.

Regards,

David Gross
Dominion Engineering, Inc.

-----Original ...
  Topic: [Xansys] [STRUCT] Centroid of mode shape
david.gross

Replies: 16
Views: 15103

PostForum: XANSYS   Posted: Sat Feb 09, 2013 8:37 pm   Subject: [Xansys] [STRUCT] Centroid of mode shape
Chris,

In this case we did, in fact, check diameters and wall thicknesses at a
number of axial and azimuthal locations and corrected for them, yet we were
still off. We proceeded to measure modulus ...
  Topic: [Xansys] [STRUCT] Centroid of mode shape
david.gross

Replies: 16
Views: 15103

PostForum: XANSYS   Posted: Fri Feb 08, 2013 2:41 pm   Subject: [Xansys] [STRUCT] Centroid of mode shape
Gents,

I had the opposite experience with free-free lateral vibration of a simple
length of straight pipe. The point of the test was to QA validate the
instruments, DAQ, etc. but the frequencies wer ...
  Topic: [Xansys] [STRUCT] Centroid of mode shape
david.gross

Replies: 16
Views: 15103

PostForum: XANSYS   Posted: Thu Feb 07, 2013 1:01 pm   Subject: [Xansys] [STRUCT] Centroid of mode shape
Francesca,

Take a look at UPCOORD, which modifies the geometry based on the deflected
shape. Once you've modified the geometry in this manner, you could use the
normal statistics that go to the *.ou ...
  Topic: Areas selection
david.gross

Replies: 2
Views: 3115

PostForum: XANSYS   Posted: Thu Feb 07, 2013 10:49 am   Subject: [Xansys] Areas selection
Mohammad,

Do a KLIST and see what that tells you.

If you want more help, you'll need to give us some real input and output to
go on, because right now you haven't told us much more than "my sel ...
  Topic: [FTT_SPAM] - [Xansys] [APDL NGEN command]
david.gross

Replies: 30
Views: 19498

PostForum: XANSYS   Posted: Tue Jan 29, 2013 4:20 pm   Subject: [Xansys] [FTT_SPAM] - [APDL NGEN command]
Giuseppe,

Well, I beg to differ; your node numbers are consecutive, but you seem to
want to enforce some sort of order that you find more aesthetically pleasing
and easy to track. I understand your ...
  Topic: [FTT_SPAM] - Re: [Xansys] [FTT_SPAM] - [APDL NGEN command]
david.gross

Replies: 3
Views: 1955

PostForum: XANSYS   Posted: Tue Jan 29, 2013 2:38 pm   Subject: [Xansys] [FTT_SPAM] - Re: [FTT_SPAM] - [APDL NGEN command]
Giuseppe,

You do realize that you can specify "ALL" for your node numbers and it will
use the selected set, right?

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-- ...
  Topic: [APDL Divide Area by line error with meshed lines]
david.gross

Replies: 7
Views: 9272

PostForum: XANSYS   Posted: Fri Dec 07, 2012 6:56 am   Subject: [Xansys] [APDL Divide Area by line error with meshed lines]
Giuseppe,

You're really making this hard. When you have an irregular area (i.e., not
four-sided), by all means it makes sense to do a little Boolean work to
simplify the areas so that they "loo ...
  Topic: [Xansys] [STRUC] Transient Analysis of a Plate - High Initia
david.gross

Replies: 2
Views: 2668

PostForum: XANSYS   Posted: Tue Oct 30, 2012 9:58 am   Subject: [Xansys] [STRUC] Transient Analysis of a Plate - High Initia
Lee,

Something I've tripped over in the past is that, if you don't specify
initial velocity using the IC command, it is inferred from the first two
load steps. If you happen to have a really tiny in ...
  Topic: [Apdl Struct Contact elements]
david.gross

Replies: 13
Views: 9625

PostForum: XANSYS   Posted: Mon Oct 29, 2012 10:53 am   Subject: [Xansys] [Apdl Struct Contact elements]
Giuseppe,

Yes, please read the documentation. On behalf of all the ANSYS developers
who (generally silently) monitor this list, you make them sad when you don't
read the fine words that they took th ...
  Topic: [Apdl Struct Contact elements]
david.gross

Replies: 13
Views: 9625

PostForum: XANSYS   Posted: Mon Oct 29, 2012 10:28 am   Subject: [Xansys] [Apdl Struct Contact elements]
I hesitate to chime in because I really think a spoonful of RTFM is in order
here. However, I'd just like to remind everyone about the powerful and
convenient CPINTF command.

Regards,

David Gross
D ...
  Topic: PB : solving analyse pressure
david.gross

Replies: 7
Views: 13095

PostForum: XANSYS   Posted: Wed Oct 24, 2012 12:05 pm   Subject: [Xansys] PB : solving analyse pressure
Dear Anonymous,

This question seems to come up once every few years. I took the time to
write up a few paragraphs of explanation back at the turn of the century,
which is mostly as true today as it ...
  Topic: Error message: DO LOOP "xx" is not recognized BEG
david.gross

Replies: 4
Views: 14260

PostForum: XANSYS   Posted: Mon Sep 10, 2012 1:32 pm   Subject: [Xansys] Error message: DO LOOP "xx" is not recogn
Woochan,

Glad you have your problem fixed. However, Dean made an excellent point
about using ANSYS commands as variables (in case you didn't catch his
meaning, "m" is a command). You can ...
  Topic: Error message: DO LOOP "xx" is not recognized BEG
david.gross

Replies: 4
Views: 14260

PostForum: XANSYS   Posted: Mon Sep 10, 2012 12:19 pm   Subject: [Xansys] Error message: DO LOOP "xx" is not recogn
Dear Anonymous,

This is a nicely-posed question, other than the lack of a signature, so I'll
be reciprocate and give you a response. However, please figure out how to
get your name and affiliation o ...
  Topic: [APDL]Create a mesh where KP == NODES
david.gross

Replies: 32
Views: 27519

PostForum: XANSYS   Posted: Wed Sep 05, 2012 3:15 pm   Subject: [Xansys] [APDL]Create a mesh where KP == NODES
I was really hoping we'd get the Prof. on the line. Some of my favorite Car
Talk bits are when the pull the same maneuver and talk to the significant
other of the caller. Tom and Ray generally try t ...
  Topic: [Xansys] [MAPDL][STRUCT] Constraint Equation (CE) error
david.gross

Replies: 1
Views: 3740

PostForum: XANSYS   Posted: Mon Aug 13, 2012 10:58 am   Subject: [Xansys] [MAPDL][STRUCT] Constraint Equation (CE) error
Shailesh,

Most likely you have some nodes that aren't attached to any elements. Try
the following:

ALLSEL
NSLE
NSEL,INVE
NDELE,ALL
ALLSEL

This will delete any rogue nodes.

Regards,

David Gross
D ...
  Topic: Impact simulation in transient analysis (WB) - possible?
david.gross

Replies: 8
Views: 10809

PostForum: XANSYS   Posted: Thu Aug 09, 2012 6:48 am   Subject: [Xansys] Impact simulation in transient (WB) - possible?
Martin,

Speaking somewhat out of conjecture and ignorance, I believe that many
problems that are automatically assumed to require explicit analysis can
also be solved with implicit methods if that's ...
  Topic: [Xansys] Average Stress discontinuity in ANSYS WB/ Sliced bo
david.gross

Replies: 2
Views: 6522

PostForum: XANSYS   Posted: Tue Jul 31, 2012 12:37 pm   Subject: [Xansys] Average Stress discontinuity in ANSYS WB/ Sliced bo
Dear Anonymous,

I'm not up of the 1,000 lashes right now, and this is not a completely
stupid question.

The product naming is a mess. MAPDL is good old ANSYS Classic, whereas
ANSYS Mechanical is ...
  Topic: [Xansys] How to apply gaussian heat flux with out defining a
david.gross

Replies: 3
Views: 5278

PostForum: XANSYS   Posted: Wed Jul 25, 2012 6:38 am   Subject: [Xansys] How to apply gaussian heat flux with out defining a
Debabrata,

I've been staying away from this thread, but you've finally said something
compelling. Rick has asked the right question -- I question why you would
think that 547 C (1,017 F for old-scho ...
  Topic: Modifying table array elements
david.gross

Replies: 6
Views: 5818

PostForum: XANSYS   Posted: Fri Jul 13, 2012 12:14 pm   Subject: [Xansys] Modifying table array elements
Scott,

That's a real good question, and I spent a little time understanding your
problem. I'll start with the answer, and the mystery is why is my answer is
correct.

ANSWER:

Your code should termi ...
  Topic: [MAPDL] Area Fillet
david.gross

Replies: 5
Views: 5128

PostForum: XANSYS   Posted: Tue Jul 10, 2012 12:14 pm   Subject: [Xansys] [MAPDL] Area Fillet
Abid,

As Dan indicated, last time I tried to do this, I had to break up the
volume, do the fillets, and then remake the volume from the resulting areas.
That was a long time ago, and maybe there's a ...
  Topic: get number of elements of specific types
david.gross

Replies: 9
Views: 10691

PostForum: XANSYS   Posted: Mon Jul 09, 2012 8:47 am   Subject: [Xansys] get number of elements of specific types
I'm reminded of Paul Simon. I'm not sure there are 50 ways to skin this
particular cat, but it seems like I've already seen about 3 different ways
discussed and I can think of a few more that haven't ...
  Topic: [Xansys] ERROR: The inversion subroutine was supplied with a
david.gross

Replies: 3
Views: 5842

PostForum: XANSYS   Posted: Mon Jul 02, 2012 11:35 am   Subject: [Xansys] ERROR: The inversion subroutine was supplied with a
Grama,

On behalf of the XANSYS community, I would like to express our appreciation
for your participation. Your contributions of this sort are almost as good
as having Dr. Swanson himself checking i ...
  Topic: [Xansys] ERROR: The inversion subroutine was supplied with a
david.gross

Replies: 3
Views: 5842

PostForum: XANSYS   Posted: Mon Jul 02, 2012 9:41 am   Subject: [Xansys] ERROR: The inversion subroutine was supplied with a
Jim,

I've never seen it before, but my initial read is that when ANSYS tries to
invert

[K][u] = [f]

to

[u] = [K]^-1[f]

it is finding a singularity, i.e., [K] is not positive definite, further
im ...
  Topic: [Xansys] Transient Thermal Solution in Workbench 13 (Therm)
david.gross

Replies: 3
Views: 6831

PostForum: XANSYS   Posted: Fri Jun 29, 2012 5:27 am   Subject: [Xansys] Transient Thermal Solution in Workbench 13 (Therm)
Arnab,

I'm sure the lurkers over in Canonsburg, PA are scratching their heads
wondering how to make their error message more helpful than this. Try using
the following command before entering /SOLU: ...
  Topic: Modeling OSB nonlinear
david.gross

Replies: 1
Views: 5029

PostForum: XANSYS   Posted: Mon Jun 25, 2012 9:51 am   Subject: [Xansys] Modeling OSB nonlinear
Kord,

I'm looking at the Rev. 11.0 Documentation, and I haven't looked to see how
things might be different from Rev. 14.0. Rev. 11.0 documentation lists the
following element types as eligible for ...
  Topic: [Xansys] [OTHER] : Endurance limits for 301 ( different cond
david.gross

Replies: 2
Views: 2534

PostForum: XANSYS   Posted: Tue Jun 19, 2012 2:47 pm   Subject: [Xansys] [OTHER] : Endurance limits for 301 ( different cond
Chris,

For the benefit of the uninitiated, by "ASME Code Div 2" did you mean ASME
Boiler and Pressure Vessel Code, Section VIII, Division 2?

Regards,

David Gross
Dominion Engineering, Inc ...
  Topic: Layered shell submodeling
david.gross

Replies: 10
Views: 9350

PostForum: XANSYS   Posted: Thu Jun 14, 2012 9:52 am   Subject: [Xansys] Layered shell submodeling
Osama,

I don't know what dimension you think you've included your signature in, but
I can assure you it's not making it through to the rest of us.

Regards,

David Gross
Dominion Engineering, Inc.

- ...
  Topic: Workbench Mechanical Mesh
david.gross

Replies: 11
Views: 11198

PostForum: XANSYS   Posted: Wed Jun 13, 2012 9:20 am   Subject: [Xansys] Workbench Mechanical Mesh
Keith,

Thanks for digging out the original language. That pretty much summed it
up.

Way back when, I tried getting ANSYS to issue a Class 3 Error on the
documentation, and more importantly, clarif ...
  Topic: Workbench Mechanical Mesh
david.gross

Replies: 11
Views: 11198

PostForum: XANSYS   Posted: Wed Jun 13, 2012 7:07 am   Subject: [Xansys] Workbench Mechanical Mesh
Dan,

That reminds me of an early 1990's war story where I nearly got burned by
misleading documentation, which also highlights the importance of simple
hand checks. Back in those days, the manual pa ...
  Topic: Workbench Mechanical Mesh
david.gross

Replies: 11
Views: 11198

PostForum: XANSYS   Posted: Wed Jun 13, 2012 5:37 am   Subject: [Xansys] Workbench Mechanical Mesh
Is this a quiz? I feel unprepared...

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of boobalan.srini ...
  Topic: [Struct] Fail to mesh area which contains hard points
david.gross

Replies: 27
Views: 19695

PostForum: XANSYS   Posted: Thu Jun 07, 2012 7:08 am   Subject: [Xansys] [Struct] Fail to mesh area which contains hard poin
Giovanni,

Clearly you are in the camp shared by many newbie forum-dwellers who
interface with XANSYS only via the online forum, rather than the email
interface. Please be aware that the majority of ...
  Topic: [Xansys] improving mesh quality
david.gross

Replies: 4
Views: 4835

PostForum: XANSYS   Posted: Tue Jun 05, 2012 10:58 am   Subject: [Xansys] improving mesh quality
Jacob,

You can select elements that fail general mesh quality criteria with
CHECK,ESEL,WARN. This is a /PREP7 command, and will operate on the
undeformed shape. However, I guess you could issue an ...
  Topic: Find SUM of Kinetic Energy in Workbench
david.gross

Replies: 5
Views: 8705

PostForum: XANSYS   Posted: Mon Jun 04, 2012 2:48 pm   Subject: [Xansys] Find SUM of Kinetic Energy in Workbench
Aaron,

I'm confused. You didn't seem to issue ENERSOL in /POST26, as I would
expect. For example, did you try:

/POST26
ENERSOL,2,KENE
PLVAR,2

Regards,

David Gross
Dominion Engineering, Inc.

--- ...
  Topic: [Xansys] static+dynamic analysis
david.gross

Replies: 1
Views: 2796

PostForum: XANSYS   Posted: Fri Jun 01, 2012 1:20 pm   Subject: [Xansys] static+dynamic analysis
Aleksandra,

If you like your two separate analyses (static and dynamic, respectively),
the best course of action is to create a combined load step using the Load
Case Calculation commands:

Table 2.1 ...
  Topic: [Xansys] Command for connecting line in Ansys Macro
david.gross

Replies: 4
Views: 5333

PostForum: XANSYS   Posted: Wed May 30, 2012 5:32 am   Subject: [Xansys] Command for connecting line in Ansys Macro
Dan,

Your Mr. Anonymous should take a closer look at his KSEL arguments. If he's
expecting to get more than one KP out of this selection attempt, I suspect
he's incorrect in that expectation.

Regar ...
  Topic: Anyway to combine load steps?
david.gross

Replies: 6
Views: 7325

PostForum: XANSYS   Posted: Tue May 29, 2012 8:58 am   Subject: [Xansys] Anyway to combine load steps?
Dr. Hu,

The subject message typically indicates that your IVAL is greater than your
FVAL, so the *DO loop is being skipped. I would look at the values of your
parameters when this is happening.

Reg ...
  Topic: [Xansys] seismic analysis
david.gross

Replies: 1
Views: 4187

PostForum: XANSYS   Posted: Tue May 29, 2012 7:10 am   Subject: [Xansys] seismic analysis
Aleksandra,

I may have missed a problem, but I don't see anything wrong with what you've
done. However, be careful about the way you hand off from your initial
"static" timestep to the beg ...
  Topic: [Xansys] Vector plots
david.gross

Replies: 4
Views: 6110

PostForum: XANSYS   Posted: Thu May 17, 2012 6:56 am   Subject: [Xansys] Vector plots
Don't Ansys like MY brother!

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of Bohlen, Dan (GE Aviation, US)
Sent: Thursday, May 17, 2012 9:52 ...
  Topic: [Xansys] Vector plots
david.gross

Replies: 4
Views: 6110

PostForum: XANSYS   Posted: Thu May 17, 2012 6:38 am   Subject: [Xansys] Vector plots
Ian,

Try /NUMBER

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of Prentice, Ian (GE Aviati ...
  Topic: [APDL] [STRUCT] Simulate welding, volumetric locking
david.gross

Replies: 7
Views: 8198

PostForum: XANSYS   Posted: Tue May 08, 2012 11:10 am   Subject: [Xansys] [APDL] [STRUCT] Simulate welding, volumetric lockin
Perhaps the OP should elaborate on why he thinks the plane182's are volume
locking. In a highly constrained weld bead geometry, weld bead shrinkage
relative to the weld cavity puts the majority of th ...
  Topic: [Xansys] axial forces using FSUM, NFORCE commands
david.gross

Replies: 14
Views: 25894

PostForum: XANSYS   Posted: Fri May 04, 2012 12:57 pm   Subject: [Xansys] axial forces using FSUM, NFORCE commands
nsel,s,loc,z,10

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org You get equal and opposite forces from elements on both sides of a node.
T ...
  Topic: [Xansys] sum of normal forces at a section
david.gross

Replies: 9
Views: 9526

PostForum: XANSYS   Posted: Tue May 01, 2012 11:52 am   Subject: [Xansys] sum of normal forces at a section
Purushotham,

Yes, you're missing something. Loadsteps and Substeps are definitely not
the same thing. You've got at least two ways to conveniently go after your
results:

1. As Doug just suggested ...
  Topic: [Xansys] sum of normal forces at a section
david.gross

Replies: 9
Views: 9526

PostForum: XANSYS   Posted: Tue May 01, 2012 10:57 am   Subject: [Xansys] sum of normal forces at a section
Purushotham,

This is really basic stuff. Please tell us -- if you go to the command line
and simply type:

/POST1
SET,1

Do you still get the "Load set not found on result file file.rst" e ...
  Topic: [Xansys] [Tcl/Tk] running ansys using TCL
david.gross

Replies: 1
Views: 2569

PostForum: XANSYS   Posted: Tue Apr 24, 2012 6:50 am   Subject: [Xansys] [Tcl/Tk] running ansys using TCL
Fatih,

Just a guess, but you may need to supply the full filename (i.e.,
ansys130.exe) and/or full paths to these files. If I were you, I'd play
around with these sorts of things and see if it helps ...
  Topic: Modifying Contour Plot scale
david.gross

Replies: 6
Views: 7740

PostForum: XANSYS   Posted: Wed Apr 18, 2012 6:16 am   Subject: [Xansys] Modifying Contour Plot scale
Also, if you want something other than a uniform scale, look at /CVAL. I've
found this very useful, for example, to make a wider "red" zone to handle
singularities, for example:

/CVAL,1,0, ...
  Topic: Workbench and MAPDL
david.gross

Replies: 13
Views: 11782

PostForum: XANSYS   Posted: Mon Apr 16, 2012 1:51 pm   Subject: [Xansys] Workbench and MAPDL
Hint: third word, two syllables, "... useless."

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org When you figure it out, you'll ...
  Topic: Workbench and MAPDL
david.gross

Replies: 13
Views: 11782

PostForum: XANSYS   Posted: Mon Apr 16, 2012 1:05 pm   Subject: [Xansys] Workbench and MAPDL
Chris,

When you figure it out, you'll note that you've said it yourself dozens of
times...

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.or ...
  Topic: calculating stress intensity
david.gross

Replies: 15
Views: 18535

PostForum: XANSYS   Posted: Wed Apr 04, 2012 10:45 am   Subject: [Xansys] calculating stress intensity
Luis,

I'd like to note that you should be able to get the elements to print out
this result using the ETABLE inquiries. For example, using PIPE16 elements,
you will find the Max SINT anywhere in the ...
  Topic: [Xansys] butt welding of aluminum bars
david.gross

Replies: 29
Views: 28095

PostForum: XANSYS   Posted: Tue Apr 03, 2012 2:20 pm   Subject: [Xansys] butt welding of aluminum bars
Christos,

I've been waiting for Dan to come back with a terse, "Yes, I can" but
perhaps I can shed light on why he's jokingly giving you a hard time. From
your other posts, it is generall ...
  Topic: Rotating elements
david.gross

Replies: 3
Views: 3534

PostForum: XANSYS   Posted: Wed Mar 21, 2012 5:28 am   Subject: [Xansys] Rotating elements
NGEN in a cylindrical coordinate system.

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of a ...
  Topic: [Xansys] Might be time to repost this....
david.gross

Replies: 0
Views: 1810

PostForum: XANSYS   Posted: Fri Mar 16, 2012 7:59 am   Subject: [Xansys] Might be time to repost this....
Dan,

Looks like you and I are picking up the vanguard of defending the Netiquette
for a while, which is fine. I'd just like to say in continued appeasement
to Ellankavi that I thought his post was w ...
  Topic: [xansys] grouping nodes
david.gross

Replies: 10
Views: 8682

PostForum: XANSYS   Posted: Fri Mar 16, 2012 6:39 am   Subject: [Xansys] [xansys] grouping nodes
Ellankavi,

I'll be nice and respond anyway. It sounds like you're asking about
"components." From the APDL command line, you can, for example:

NSEL,S,PICK ! go ...
  Topic: Nodal stresses in shell elements (top/bottom)
david.gross

Replies: 30
Views: 36579

PostForum: XANSYS   Posted: Tue Mar 13, 2012 8:09 am   Subject: [Xansys] Nodal stresses in shell elements (top/bottom)
Chris,

This meeting of the OFB is hereby commenced. I'm working under the
assumption that when people trot out fancy 1xx and 2xx element types it is
generally because Workbench has selected these el ...
  Topic: Nodal stresses in shell elements (top/bottom)
david.gross

Replies: 30
Views: 36579

PostForum: XANSYS   Posted: Mon Mar 12, 2012 3:57 pm   Subject: [Xansys] Nodal stresses in shell elements (top/bottom)
Dear Maha,

Let me first gently remind you of the Netiquette which strongly discourages
texting shorthand in posts.

Count me among those who are perplexed by the nature of your question --
perhaps I ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Sun Mar 04, 2012 10:24 pm   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
Dean,

I stand corrected, and thank you for pointing it out. You meant that they
show up *way* at the bottom, below the rest of the attachment chain,
disconnected from his post. I see why I've been ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Sun Mar 04, 2012 9:20 pm   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
Dean,

Interesting observation. However it is showing up in the web interface,
it's not making it to the email interface. I'm not sure why that might be,
but I can assure you it's not coming through ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Sat Mar 03, 2012 2:34 pm   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
Andre,

I don't know if you're still out there or if you've already canceled, but
for your benefit and/or others I feel compelled to reply. This isn't a mean
forum, and you're not likely to get flame ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Sat Mar 03, 2012 12:57 pm   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
Barry (and Andre),

I'm going to assume that neither of you has followed this group for very
long, so I'll try to explain the spirit of the "over the top" reaction. You
are correct that Mr. ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Fri Mar 02, 2012 11:47 am   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
Fetch... the comfy pillow!

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org This is rather funny. It sounds like a Monty Python skit.


No one expec ...
  Topic: [APDL][STRUC][DYNM] Strange warning from LS-DYNA output
david.gross

Replies: 28
Views: 34547

PostForum: XANSYS   Posted: Fri Mar 02, 2012 11:03 am   Subject: [Xansys] [APDL][STRUC][DYNM] Strange warning from LS-DYNA ou
I wonder what's gonna happen next...

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of andre.jesus
Sen ...
  Topic: [Xansys] [WB][Struc]Do loop with solve command, substeps, lo
david.gross

Replies: 25
Views: 29013

PostForum: XANSYS   Posted: Tue Feb 28, 2012 7:47 am   Subject: [Xansys] loadsteps and substeps in a nonlinear static analys
Andreas,

These aren't exactly the same, because with nsubst,100,1000,10, you're
letting ANSYS decrease the loadstep by a factor of 10 (1000 divided by 10)
before giving up. Contrast this with nsubst ...
  Topic: [Xansys] [WB][Struc]Do loop with solve command, substeps, lo
david.gross

Replies: 25
Views: 29013

PostForum: XANSYS   Posted: Tue Feb 28, 2012 7:15 am   Subject: [Xansys] loadsteps and substeps in a nonlinear static analys
Andreas,

Maybe I missed it in previous threads, but you're only giving us a peephole
into the full set of solution control parameters you're using. For
starters, assuming you're using AUTOTS,ON, dic ...
  Topic: [Xansys] [WB][Struc]Do loop with solve command, substeps, lo
david.gross

Replies: 25
Views: 29013

PostForum: XANSYS   Posted: Mon Feb 27, 2012 8:40 am   Subject: [Xansys] Warning and Error Messages
Andreas,

Sorry, no. Per your previous post, I guess I'd back up in time (loading) to
just before the model went unstable and see if it is, in fact, hanging on by
a thread. If so, I'd take the non- ...
  Topic: [Xansys] [WB][Struc]Do loop with solve command, substeps, lo
david.gross

Replies: 25
Views: 29013

PostForum: XANSYS   Posted: Mon Feb 27, 2012 8:21 am   Subject: [Xansys] Warning and Error Messages
You guys neglected to mention that the second and the third may be related.
If you don't have the whole model selected, that can easily cause the model
to be numerically unstable. I would start by un ...
  Topic: WB14-Static Structrual-Ceramic Capillary Fracture
david.gross

Replies: 3
Views: 2805

PostForum: XANSYS   Posted: Thu Feb 16, 2012 12:14 pm   Subject: [Xansys] WB14-Static Structrual-Ceramic Capillary Fracture
Roger,

My personal opinion is that when dealing with brittle materials -- and I
would generally consider glass to be in this category -- the best failure
theory is maximum principal stress (i.e., S1) ...
  Topic: Moving coordinate system in ANSYS
david.gross

Replies: 24
Views: 33483

PostForum: XANSYS   Posted: Tue Jan 31, 2012 11:11 am   Subject: [Xansys] R: [APDL] Error
Andrei,

Perhaps you can elaborate on why you say the contact is set up wrong. It seems to me that if you can converge an initial step with a small displacement and then increase the displacement unt ...
  Topic: Moving coordinate system in ANSYS
david.gross

Replies: 24
Views: 33483

PostForum: XANSYS   Posted: Tue Jan 31, 2012 10:44 am   Subject: [Xansys] R: [APDL] Error
Andrei,

Note that Riccardo has already stated, " I've run a test with a smaller displacement constraint and I've got no error." This is strongly suggestive of approaches such as:

a. Incr ...
  Topic: [Xansys] [OTHER] Is ANSYS a Productive Tool for MechanicalEn
david.gross

Replies: 0
Views: 1252

PostForum: XANSYS   Posted: Thu Dec 15, 2011 8:14 am   Subject: [Xansys] [OTHER] Is ANSYS a Productive Tool for MechanicalEn
ANSYS/Mechanical was the same interface as full-blown ANSYS/Multiphysics. The only difference was that the solver would abort if you tried to use "non-mechanical" physics (e.g., thermal, EM ...
  Topic: [Xansys] ANSYS - MPC184 Rigid Beams and Joints Model Converg
david.gross

Replies: 0
Views: 2048

PostForum: XANSYS   Posted: Mon Nov 28, 2011 11:32 am   Subject: [Xansys] ANSYS - MPC184 Rigid Beams and Joints Model Converg
I was thinking the same thing, and in particular wondering if the OP might
have part of the model unselected when he went to solve. This can lead to
the sort of messages he noted.

Regards,

David Gr ...
  Topic: extract shear along weld throat in WB
david.gross

Replies: 9
Views: 10107

PostForum: XANSYS   Posted: Wed Nov 23, 2011 3:26 pm   Subject: [Xansys] extract shear along weld throat in WB
Chris,

I wonder just how many Xansys members understand what is meant by "SASI
time"...

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xa ...
  Topic: Cold Working In Ansys
david.gross

Replies: 21
Views: 13339

PostForum: XANSYS   Posted: Thu Nov 17, 2011 2:10 pm   Subject: [Xansys] Cold Working In Ansys
Moazzam,

I'm assuming that you're talking about simulating a metal plate, not trying
to use APDL to actually put residual stress in a plate. ;->

There have to be a dozen different ways to do this ...
  Topic: different mesh side by side
david.gross

Replies: 3
Views: 3035

PostForum: XANSYS   Posted: Tue Nov 01, 2011 11:36 am   Subject: [Xansys] different mesh side by side
Nor,

Your question is a bit terse. You may be implying what is called an
"incompatible mesh" at the interface between these regions. As Edmund
notes, the answer is "it depends". ...
  Topic: How to specify the time step size in transient problem
david.gross

Replies: 2
Views: 3211

PostForum: XANSYS   Posted: Thu Oct 27, 2011 7:09 am   Subject: [Xansys] How to specify the time step size in transient prob
Dear Mr. Cho,

Note first that your *full* name must be supplied if you desire a response
in this forum. I'll start by answering your question with a question.

It is not clear whether you are askin ...
  Topic: Material and element type for Thin Orthotropic Plate (Struc)
david.gross

Replies: 14
Views: 19426

PostForum: XANSYS   Posted: Tue Oct 25, 2011 1:52 pm   Subject: [Xansys] Material and element type for Thin Orthotropic Plat
Ashkan,

Looks like Chris has got you a bit riled up. I'm assuming that you haven't
been reading Mr. Wright for very long, or you wouldn't have taken offense.

Your original question has drifted away ...
  Topic: Corrupt db file
david.gross

Replies: 8
Views: 9416

PostForum: XANSYS   Posted: Sat Oct 22, 2011 6:50 pm   Subject: [Xansys] Corrupt db file
Saurabh,

That could be a problem. In my limited experience, you shouldn't expect
ANSYS to successfully read older *.db files. Best to get your hands on the
older version and get out to an ASCII for ...
  Topic: Corrupt db file
david.gross

Replies: 8
Views: 9416

PostForum: XANSYS   Posted: Sat Oct 22, 2011 11:02 am   Subject: [Xansys] Corrupt db file
If you have access to the older version of ANSYS, you can write to ASCII with CDWRITE.

Regards,
David Gross
Dominion Engineering, Inc.

Sent from my iPhone

On Oct 22, 2011, at 12:36 PM, "saur ...
  Topic: Interference fit simulation
david.gross

Replies: 5
Views: 9449

PostForum: XANSYS   Posted: Fri Oct 07, 2011 7:32 am   Subject: [Xansys] Interference fit simulation
Not LS-DYNA. Your question suggests that you need to learn a lot more about
the relative merits of implicit vs. explicit analysis. Try searching Google
on this topic. I know that Sheldon wrote a ni ...
  Topic: warning -''equation solver pivot''?
david.gross

Replies: 4
Views: 45629

PostForum: XANSYS   Posted: Tue Oct 04, 2011 7:46 am   Subject: [Xansys] warning -''equation solver pivot''?
Nor,

This question seems to come up once every few years. I took the time to write up a few paragraphs of explanation back at the turn of the century, which is mostly as true today as it was then - ...
  Topic: [Xansys] Hardware, september 2011
david.gross

Replies: 13
Views: 13911

PostForum: XANSYS   Posted: Fri Sep 23, 2011 10:15 am   Subject: [Xansys] Hardware, september 2011
Uffe,

We got our 4-CPU pack under ANSYS 11 for use with CFX. The original
licenses we had (until recently) only worked with CFX, not ANSYS mechanical.
As part of our recent renewal, we were able to ...
  Topic: [Xansys] Hardware, september 2011
david.gross

Replies: 1
Views: 2024

PostForum: XANSYS   Posted: Wed Sep 21, 2011 3:14 pm   Subject: [Xansys] Hardware, september 2011
Uffe,

I've been disappointed that no one jumped on this thread because I've had
similar questions of late. I can help a little bit:

We all try to share a Dell PE2950 Rack Server computer with 2 qua ...
  Topic: [OTHER] Output file from sparse solver
david.gross

Replies: 2
Views: 2354

PostForum: XANSYS   Posted: Mon Sep 19, 2011 10:25 am   Subject: [Xansys] [OTHER] Output file from sparse solver
Hello Christiane,

Here are some tools that can be used to control when output goes to the
*.out files:

/OUTPUT
/GO
/GOPR
/NOPR

Other commands might influence suppression of certain types of chatter ...
  Topic: Ansys Classic, save plots
david.gross

Replies: 10
Views: 21323

PostForum: XANSYS   Posted: Thu Sep 08, 2011 8:01 am   Subject: [Xansys] Ansys Classic, save plots
What James suggested may help in many cases, but I for one like using the
OFB-compliant email interface, which of course imposes no requirements on
the form of the message.

Regards,

David Gross
Domi ...
  Topic: Ansys Classic, save plots
david.gross

Replies: 10
Views: 21323

PostForum: XANSYS   Posted: Thu Sep 08, 2011 7:32 am   Subject: [Xansys] Ansys Classic, save plots
"Manu",

I don't know how you escaped Martin's wrath, but there may be an answer out
there for you if you provide the required FULL NAME and AFFILIATION (even if
student).

Regards,

David G ...
  Topic: [Xansys] test - pls delete/ignore
david.gross

Replies: 6
Views: 5706

PostForum: XANSYS   Posted: Tue Sep 06, 2011 3:44 pm   Subject: [Xansys] test - pls delete/ignore
I think Code names are violations of the XANSYS rules...

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org I had to Google to get educated on this bit ...
  Topic: [Xansys] test - pls delete/ignore
david.gross

Replies: 6
Views: 5706

PostForum: XANSYS   Posted: Tue Sep 06, 2011 2:30 pm   Subject: [Xansys] test - pls delete/ignore
I had to Google to get educated on this bit of cultural reference. Seemed
good enough to share:

Gale: All right, ya hayseeds, it's a stick-up. Everybody freeze. Everybody
down on the ground.
Feisty ...
  Topic: [Xansys] [ANSYS][WB] Bolt analysis using pretension beam ele
david.gross

Replies: 10
Views: 14917

PostForum: XANSYS   Posted: Fri Aug 12, 2011 8:01 am   Subject: [Xansys] [ANSYS][WB] Bolt analysis using pretension beam ele
Eddie,

When you couple everything in one big set, then you're constraining every
node to move the same way. What you want is for each *coincident* pair of
nodes to move like that. Two options: ...
  Topic: error in meshing PIPE288
david.gross

Replies: 17
Views: 22217

PostForum: XANSYS   Posted: Mon Aug 01, 2011 7:49 am   Subject: [Xansys] error in meshing PIPE288
No, it won't.

Regards,

David Gross
Dominion Engineering, Inc.

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf
Of abdalellah.mohmmed
Sent: Sun ...
  Topic: [Xansys] J-plastic values for Ramberg-Osgood type material
david.gross

Replies: 0
Views: 3142

PostForum: XANSYS   Posted: Fri Jul 29, 2011 2:08 pm   Subject: [Xansys] J-plastic values for Ramberg-Osgood type material
Chary,

First, let me admonish you for not using your full name in posting. This
has become a very hot-button issue in recent times, but I'm feeling
charitable on a Friday afternoon so I'll jump in a ...
  Topic: Issue with mapped meshing for geometry with holes
david.gross

Replies: 2
Views: 3819

PostForum: XANSYS   Posted: Wed Jul 27, 2011 11:04 am   Subject: [Xansys] Issue with mapped meshing for geometry with holes
Purushotham,

Ducking for the moment the heart of your question, you can patch up this
situation by use of the NUMMRG commands. You can clean this up using a
NUMMRG, NODE followed by a NUMMRG, KP, us ...
  Topic: [Xansys] [OTHER] [APDL] asymmetric constraints
david.gross

Replies: 4
Views: 5388

PostForum: XANSYS   Posted: Thu Jun 23, 2011 7:53 am   Subject: [Xansys] [OTHER] [APDL] asymmetric constraints
Luisier,

Yes, it's very possible, but I guess we're just not communicating.

Let's go back to the beginning. I don't think we understand what you're
trying to accomplish, or more precisely, why you ...
  Topic: [Xansys] [OTHER] [APDL] asymmetric constraints
david.gross

Replies: 9
Views: 10007

PostForum: XANSYS   Posted: Tue Jun 21, 2011 5:39 am   Subject: [Xansys] [OTHER] [APDL] asymmetric constraints
Luisier,

Sounds like you want to have your cake and eat it, too. You want to
eliminate non-linearities for speed, but you don't want to lose non-linear
capabilities.

Take a look at old-school conta ...
  Topic: [Xansys] Weld residual stress analysis
david.gross

Replies: 2
Views: 4807

PostForum: XANSYS   Posted: Thu Jun 16, 2011 11:45 am   Subject: [Xansys] Weld residual stress analysis
Dan/Robert,

I can confirm that the weld residual stress approaches yield and that
subsequent weld beads have significant effects on the previously-laid beads.
Getting these effects close to right req ...
  Topic: [STRUC] Multiframe restart on press-fit analysis
david.gross

Replies: 5
Views: 11608

PostForum: XANSYS   Posted: Wed Jun 15, 2011 11:33 am   Subject: [Xansys] [STRUC] Multiframe restart on press-fit analysis
My experience simply is that you're always in a risky state trying to
restart an analysis from an unexpected termination. Therefore, I either
explicitly make some clean "safe harbors" by co ...
  Topic: [STRUC] Multiframe restart on press-fit analysis
david.gross

Replies: 5
Views: 11608

PostForum: XANSYS   Posted: Wed Jun 15, 2011 9:25 am   Subject: [Xansys] [STRUC] Multiframe restart on press-fit analysis
Christiane,

This probably doesn't help much, but I'll chime in. I'm sort of old school
regarding restarts, and have never trusted multiframe restart. To the
extent that I do restarts, I do them the ...
  Topic: [Xansys] [ structural ] evaluation of secondary stresses in
david.gross

Replies: 17
Views: 22540

PostForum: XANSYS   Posted: Wed May 18, 2011 10:21 am   Subject: [Xansys] Vector graphics output
Chris,

This is a set of commands that I use to make such graphic files and also
manipulate the plot to a preferred orientation, color depth, scale, etc.:

/show,pscr
pscr,color,1
pscr,tranx,60
pscr, ...
  Topic: [Xansys] [XANSYS] STRUCT - Plastic analysis with zero tangen
david.gross

Replies: 1
Views: 2041

PostForum: XANSYS   Posted: Tue Mar 22, 2011 6:15 am   Subject: [Xansys] [XANSYS] STRUCT - Plastic analysis with zero tangen
This type of error should respond to mesh refinement, however.

Regards,

David Gross
Dominion Engineering, Inc.

At 01:25 AM 3/22/2011, you wrote:
>I can't quite recall how ANSYS does it, ...
  Topic: [XANSYS] STRUCT - Plastic analysis with zero tangent modulus
david.gross

Replies: 3
Views: 5915

PostForum: XANSYS   Posted: Mon Mar 21, 2011 6:26 pm   Subject: [Xansys] [XANSYS] STRUCT - Plastic analysis with zero tangen
Phil,

You should find that ANSYS is using SIGE as the yield criterion. I would
be surprised to find that the SIGE stresses are above Sy. However, you may
well find that any other stress compo ...
  Topic: [Xansys] fast displacement simulation
david.gross

Replies: 6
Views: 3042

PostForum: XANSYS   Posted: Mon Mar 14, 2011 5:26 am   Subject: [Xansys] fast displacement simulation
Dominique,

While I echo the advice about picking up a basic dynamics textbook, I
believe you're groping for a rule of thumb regarding "pseudo-static"
loading, where the dynamic loadin ...
  Topic: [Xansys] [WB 13] Sub modelling Rule of Thumb
david.gross

Replies: 5
Views: 7136

PostForum: XANSYS   Posted: Tue Mar 01, 2011 9:56 am   Subject: [Xansys] [WB 13] Sub modelling Rule of Thumb
Sorry to respond to my own post. I meant to say (beam height)^-1, as Beta
has units of [1/length].

Regards,

David Gross
Dominion Engineering, Inc.

At 11:38 AM 3/1/2011, David Gross wrote: ...
  Topic: [Xansys] [WB 13] Sub modelling Rule of Thumb
david.gross

Replies: 5
Views: 7136

PostForum: XANSYS   Posted: Tue Mar 01, 2011 9:39 am   Subject: [Xansys] [WB 13] Sub modelling Rule of Thumb
Eddie,

I like to use 2*pi/Beta, where Beta is a coefficient that is defined in
references such as Timoshenko's Strength of Materials (Part II, 1958
Ed.). It is a function of R, t, and poisson ...
  Topic: [Xansys] Where is the mistake in my calculations? (PLANE42)
david.gross

Replies: 7
Views: 9026

PostForum: XANSYS   Posted: Mon Sep 21, 2009 2:15 pm   Subject: [Xansys] Where is the mistake in my calculations? (PLANE42)
Not so fast.

Are you really looking for a result that matches all three programs, but is
further from physical reality? The "extra displacement shapes" you turned
off are there to attemp ...
 
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