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  Topic: [Xansys] Negative slope stress-strain curve for concrete
ayo.brimmo

Replies: 4
Views: 7619

PostForum: XANSYS   Posted: Sun Jun 21, 2015 1:01 am   Subject: [Xansys] Negative slope stress-strain curve for concrete
Akram,

From what I understand, this is not possible on ANSYS. Harish gave a good explanation of why this is so in one of the previous threads.

It also amazed me when someone claimed to have done t ...
  Topic: [Xansys] THERMAL STRUCTURAL COUPLING
ayo.brimmo

Replies: 9
Views: 10400

PostForum: XANSYS   Posted: Sat Jun 20, 2015 4:15 am   Subject: [Xansys] THERMAL STRUCTURAL COUPLING
I gave two options. The first one doesn't require APDL.

Ayo Brimmo
Masdar, UAE

On 20 Jun 2015, at 14:04, andrea.vironda <andrea.vironda@vms-tvd.net> wrote:


ayo.brimmo wrote:
use a command t ...
  Topic: [Xansys] THERMAL STRUCTURAL COUPLING
ayo.brimmo

Replies: 9
Views: 10400

PostForum: XANSYS   Posted: Fri Jun 19, 2015 1:04 am   Subject: [Xansys] THERMAL STRUCTURAL COUPLING
Andrea,

On workbench, you have two options:

-- link a structural analysis to a thermal one so the solution from the thermal analysis is used as a load for the structural analysis. This would be a ...
  Topic: [Xansys] ANSYS Mechanical Restart Question
ayo.brimmo

Replies: 23
Views: 25609

PostForum: XANSYS   Posted: Wed Jun 03, 2015 10:48 am   Subject: [Xansys] ANSYS Mechanical Restart Question
Check out the UPGEOM or UPCOORD commands. You can use them to add displacements from a result file/ previous analysis and update your geometry to the deformed geometry. The updated geometry can then b ...
  Topic: [Xansys] Writing Workbench database command log to a file
ayo.brimmo

Replies: 1
Views: 2012

PostForum: XANSYS   Posted: Fri May 01, 2015 11:42 am   Subject: [Xansys] Writing Workbench database command log to a file
Solved.

Obviously, I just needed to export the .dat file to get the log. This warrants another cup of coffee.

Sorry for the bother.

Best,
Ayo Brimmo
Masdar
UAE

T
-----Original Message-----
From: X ...
  Topic: [Xansys] Writing Workbench database command log to a file
ayo.brimmo

Replies: 1
Views: 2012

PostForum: XANSYS   Posted: Fri May 01, 2015 11:16 am   Subject: [Xansys] Writing Workbench database command log to a file
Dear All,

Can someone please guide me on writing the database command log to a file- if possible at all - on workbench. I tried doing this by adding a command snippet to the project's branch. The sni ...
  Topic: [Xansys] {Transient Strutural} Time step dependent solutions
ayo.brimmo

Replies: 5
Views: 4329

PostForum: XANSYS   Posted: Tue Feb 24, 2015 4:05 am   Subject: [Xansys] {Transient Strutural} Time step dependent solutions
Peter,

Thanks a lot for your insights. You were right about the reason for time step dependent Q factor -- smaller time steps have a greater capability to resolve higher frequencies. Tried to wait fo ...
  Topic: [Xansys] {Transient Strutural} Time step dependent solutions
ayo.brimmo

Replies: 5
Views: 4329

PostForum: XANSYS   Posted: Fri Feb 13, 2015 3:48 am   Subject: [Xansys] {Transient Strutural} Time step dependent solutions
Dr. Peter,

Thanks a lot for the response. This explanation makes a lot of sense.

Another question: After what point during the transient response is it safe to say the solution is homogenous?

Bes ...
  Topic: [Xansys] {Transient Strutural} Time step dependent solutions
ayo.brimmo

Replies: 5
Views: 4329

PostForum: XANSYS   Posted: Thu Feb 12, 2015 4:23 pm   Subject: [Xansys] {Transient Strutural} Time step dependent solutions
Dear All,

I developed a model to estimate the Q factor (measure of the energy loss) of a damped cantilever. I did this in two ways: Using the Fluid structural Interaction (FSI) and the FLUID136 eleme ...
  Topic: [Xansys] Ansys Classic how to save an animation as a .avi fi
ayo.brimmo

Replies: 12
Views: 11704

PostForum: XANSYS   Posted: Thu Feb 12, 2015 12:12 pm   Subject: [Xansys] Ansys Classic how to save an animation as a .avi fi
The idea is to disable aero. Use the classic theme. For some reason that's the only way animations show up.

Ayo Brimmo
Masdar
UAE

-----Original Message-----
From: Xansys Using Winders 7



-----Orig ...
  Topic: [Xansys] FLuid Damping FLUID136 Elements
ayo.brimmo

Replies: 3
Views: 4334

PostForum: XANSYS   Posted: Sat Jan 24, 2015 2:21 pm   Subject: [Xansys] FLuid Damping FLUID136 Elements
To answer my own question:

First: For some reason, the squeeze film element must be oriented in the Z axis and attached to a surface at the origin of the axis. Hence, if a cantilever is to be damped ...
  Topic: [Xansys] FLuid Damping FLUID136 Elements
ayo.brimmo

Replies: 3
Views: 4334

PostForum: XANSYS   Posted: Mon Jan 12, 2015 5:17 am   Subject: [Xansys] FLuid Damping FLUID136 Elements
Sorry for the omission.

It's all in bricks (hex meshes). Used solid187 elements

Ayo Brimmo
Research Engineer
Masdar, UAE

On 10 Jan 2015, at 16:32, Martin Liddle <xansys05@tynecomp.co.uk> wr ...
  Topic: [Xansys] FLuid Damping FLUID136 Elements
ayo.brimmo

Replies: 3
Views: 4334

PostForum: XANSYS   Posted: Sat Jan 10, 2015 4:19 am   Subject: [Xansys] FLuid Damping FLUID136 Elements
Dear All,

I am trying to use the FLUID136 elements to model the squeeze film damping of a cantilever beam. Below is the snippet I used to do this:

" et, 10, 136 ! Fluid 136 el ...
  Topic: [Xansys] How to import pressure of all time steps from Fluen
ayo.brimmo

Replies: 0
Views: 1178

PostForum: XANSYS   Posted: Wed Oct 29, 2014 4:14 pm   Subject: [Xansys] How to import pressure of all time steps from Fluen
David,

Came across a model that would definitely be useful to you. Check out " Squeeze Film Damper example case using Fluid Structure Interaction (FSI) with comparisons to published data" i ...
  Topic: [Xansys] How to do FSI analysis of Small Flapping Wings
ayo.brimmo

Replies: 0
Views: 975

PostForum: XANSYS   Posted: Thu Sep 25, 2014 2:05 am   Subject: [Xansys] How to do FSI analysis of Small Flapping Wings
David,

I would love to help but your question is too ambiguous.

ANSYS has a tutorial for a piezo-electric cantilever using FSI. I think that would be a good place to start. Neglecting the piezo-elec ...
  Topic: mesh defeaturing in WB
ayo.brimmo

Replies: 1
Views: 1818

PostForum: XANSYS   Posted: Sun Jun 01, 2014 7:16 am   Subject: [Xansys] mesh defeaturing in WB
Came across this one before.

Clear generated data on your model and retry. In my case the problem was some contact I had gotten rid of on design modeller that was still showing up in mechanical even ...
  Topic: [STRUC]how ElasticStress is calculated considering ThermalSt
ayo.brimmo

Replies: 16
Views: 12392

PostForum: XANSYS   Posted: Wed May 21, 2014 8:35 am   Subject: [Xansys] [STRUC]how ElasticStress is calculated considering
Looking at the fundamental stress vector equation (equation4-22), the elastic strain vector term actually takes into account the thermal strain vector. Look through the first few pages of the "st ...
  Topic: Required supports in screw rotation
ayo.brimmo

Replies: 8
Views: 9870

PostForum: XANSYS   Posted: Sun May 18, 2014 7:51 am   Subject: [Xansys] Required supports in screw rotation
This totally depends on what you are trying to model.

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of bhishan.kayastha
Sent: Sunday, May 18, 2014 6:43 PM
To: ...
  Topic: Required supports in screw rotation
ayo.brimmo

Replies: 8
Views: 9870

PostForum: XANSYS   Posted: Sun May 18, 2014 7:32 am   Subject: [Xansys] Required supports in screw rotation
How this would work is beyond me.

Anyways, if the solution failed to converge what you should be bothered about is the error message not the warning message.

-----Original Message-----
From: Xansys ...
  Topic: Required supports in screw rotation
ayo.brimmo

Replies: 8
Views: 9870

PostForum: XANSYS   Posted: Sun May 18, 2014 7:12 am   Subject: [Xansys] Required supports in screw rotation
Imagine what would happened if you had this same setup in real life. If you don't constrain the screw all through radially, it would most likely fall off.

To avoid rigid body motion, try making the ...
  Topic: [WB] [Mechanical] Lighting options
ayo.brimmo

Replies: 6
Views: 14154

PostForum: XANSYS   Posted: Thu May 15, 2014 2:40 pm   Subject: [Xansys] [WB] [Mechanical] Lighting options
You tried using /light as a command on workbench?

Ayo Brimmo
Masdar

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of aaron.caba
Sent: Friday, May 16, 2014 1:36 ...
  Topic: TCC & ECC in table format in CONTA172
ayo.brimmo

Replies: 7
Views: 4945

PostForum: XANSYS   Posted: Wed May 14, 2014 12:18 pm   Subject: [Xansys] TCC & ECC in table format in CONTA172
________________________________________
From: Xansys <xansys-bounces@xansys.org> on behalf of tanumay.bhattacharya <tbhattacharya@nfc.gov.in>
Sent: Wednesday, May 14, 2014 4:02 PM
To: xan ...
  Topic: [Xansys] TCC & ECC in table format in CONTA172
ayo.brimmo

Replies: 1
Views: 1349

PostForum: XANSYS   Posted: Wed May 14, 2014 12:09 pm   Subject: [Xansys] TCC & ECC in table format in CONTA172
By definition, this is right but for some mysterious reasons, I recently had to include a definition for the target contact as well to get a model to work as it should.

I might be wrong but maybe the ...
  Topic: TCC & ECC in table format in CONTA172
ayo.brimmo

Replies: 7
Views: 4945

PostForum: XANSYS   Posted: Wed May 14, 2014 3:48 am   Subject: [Xansys] TCC & ECC in table format in CONTA172
Pardon the cramped up text in the previous mail.

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of Ayoola Brimmo
Sent: Wednesday, May 14, 2014 2:20 PM
To: ANSYS ...
  Topic: TCC & ECC in table format in CONTA172
ayo.brimmo

Replies: 7
Views: 4945

PostForum: XANSYS   Posted: Wed May 14, 2014 3:20 am   Subject: [Xansys] TCC & ECC in table format in CONTA172
See sample command for inputting ECC as function of temperature:

/prep7
*DIM, ECCTABLE,5,1,1, temp !define table size and temperature dependence
*SET, ECCTABLE(1,0,1), 50 !temperature in ...
  Topic: Temperature dependent stress strain data interpretation
ayo.brimmo

Replies: 3
Views: 3662

PostForum: XANSYS   Posted: Sat May 10, 2014 5:03 am   Subject: [Xansys] Temperature dependent stress strain data interpreta
What I would do to convince myself is:
- Build a simple model;
- Input stress-strain data for 100C;
- Impose 75C temperatures and some structural load;
- Plot the stress-strain results at each nod ...
  Topic: [Xansys] [struct] Stress-Strain Curve with negative slope
ayo.brimmo

Replies: 3
Views: 4937

PostForum: XANSYS   Posted: Tue Apr 15, 2014 7:21 am   Subject: [Xansys] [struct] Stress-Strain Curve with negative slope
Harish,

Thanks for the reply. Another reason to believe he wasn't paying attention to his student's explanation of what was actually modeled.

Best,
Ayo Brimmo
Masadr, UAE



-----Original Message--- ...
  Topic: [Xansys] [struct] Stress-Strain Curve with negative slope
ayo.brimmo

Replies: 0
Views: 923

PostForum: XANSYS   Posted: Tue Apr 15, 2014 7:04 am   Subject: [Xansys] [struct] Stress-Strain Curve with negative slope
Hi,

In the regional ANSYS conference held in Dubai last year, one of the presenters claimed to have modeled a material with a strain-stress curve which included the necking region (negative slope). A ...
  Topic: Shell and Tubbe Heat Exchanger Design - Fluent
ayo.brimmo

Replies: 6
Views: 6885

PostForum: XANSYS   Posted: Mon Apr 14, 2014 4:39 pm   Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent
Just remembered I did some models of this a while back. Dug up the results and it turned out that in comparison to empirical correlation in Incopera my comsol model were more accurate than fluent. Cou ...
  Topic: Contact Analysis of Hip Joint in Ansys
ayo.brimmo

Replies: 16
Views: 15655

PostForum: XANSYS   Posted: Mon Apr 14, 2014 3:34 pm   Subject: [Xansys] Contact Analysis of Hip Joint in Ansys
Maria,

"outres, all" worked fine for me when I wanted to plot electrical contact resistance.

Also, I read on one of PADT's blogs that the undocumented command " rstsuppress,none" ...
  Topic: Shell and Tubbe Heat Exchanger Design - Fluent
ayo.brimmo

Replies: 6
Views: 6885

PostForum: XANSYS   Posted: Mon Apr 14, 2014 10:09 am   Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent
Benton,

You have to be a little more specific about your problem. What errors are you getting? How do you know the meshing is not correct??

Plus it's a xansys netiquette to include your affiliation ...
  Topic: improving contact between two surfaces
ayo.brimmo

Replies: 7
Views: 6438

PostForum: XANSYS   Posted: Thu Apr 10, 2014 12:23 am   Subject: [Xansys] improving contact between two surfaces
Bhishan,

{Disclaimer}: Using a bonded interface to model screwing is at your own risk.

"Near" and "Far" are open while "sliding" "sticking" are closed.

It ...
  Topic: improving contact between two surfaces
ayo.brimmo

Replies: 7
Views: 6438

PostForum: XANSYS   Posted: Tue Apr 08, 2014 4:01 am   Subject: [Xansys] improving contact between two surfaces
Bhishan,

Contact status is either open, closed or penetrating so you might have to explain what you are trying to improve here.

Best,
Ayo Brimmo
Masdar, UAE

-----Original Message-----
From: Xansys ...
  Topic: Weird Piezo-analysis results after changing Unit Systems
ayo.brimmo

Replies: 4
Views: 3818

PostForum: XANSYS   Posted: Mon Apr 07, 2014 6:39 am   Subject: [Xansys] Weird Piezo-analysis results after changing Unit Sy
Perhaps your load was too small to give any displacement in the first run. Punching a rock with your fist wouldn't give any displacement but try replacing the rock with someone's face. Get it?


Best, ...
  Topic: improving contact between two surfaces
ayo.brimmo

Replies: 7
Views: 6438

PostForum: XANSYS   Posted: Mon Apr 07, 2014 5:12 am   Subject: [Xansys] improving contact between two surfaces
Bhishan,

I remember it being repeatedly pointed out here that this model would not work with a frictionless interface. Although I don't totally understand what you are trying to improve in the contac ...
  Topic: Specifying Yield stress at different temperatures in ANSYS
ayo.brimmo

Replies: 6
Views: 7028

PostForum: XANSYS   Posted: Sun Apr 06, 2014 7:45 am   Subject: [Xansys] Specifying Yield stress at different temperatures i
Tanumay,

A glance at your code tells me that you don't have a lab for the MPDATA you are trying to use to input Yield Stress. Don't think there's a way ANSYS would know that yield stress is what you ...
  Topic: Film coefficient as a function of temperature
ayo.brimmo

Replies: 3
Views: 2943

PostForum: XANSYS   Posted: Wed Oct 09, 2013 2:03 am   Subject: RE:
I think you might want to estimate the heat transfer coefficient over the expected temperature range of the elements, tabulate the solution then input directly.

So lets say you expect the temperat ...
  Topic: Command to control contact pressure
ayo.brimmo

Replies: 0
Views: 740

PostForum: XANSYS   Posted: Tue Oct 01, 2013 7:19 am   Subject: Command to control contact pressure
I am performing a structural analysis on workbench where I want to implement chemical expansion of a body in contact with another, in addition to thermal expansion. I have a stress-strain relationship ...
 
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