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Modeling of leaks in elastomeric seals

 

Hello guys,

Anyone knows how to do Modeling of leaks in elastomeric seals, like leak thru O-ring etc in Abaqus. I need to use Hyperelastic models.
 
Regards,

Jithin Devan P
Piezoelectric Sensors & Actuators Lab
Dept. of Applied Mechanics
Indian Institute of Technology, Madras
Chennai - 600036, India
Phone: +91 9620732849
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strain softening

 

I have looked at Abaqus tutorial and it's written there:

"It is possible to define the material to be strain softening as well as strain hardening."


However, if one implements the strain softening (strain-stress data) directly via tabular data in Abaqus, the error message will appear says the  VARIABLES MUST BE ARRANGED IN ASCENDING ORDER!


My question is how is it possible to define the strain softening in Abaqus? Is there any built-in option for this purpose?


Thanks!

 

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Corrosion in Abaqus

 

Hi all

Any one can tell me how to simulate corrosion in abaqus.

thanks

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Using subroutine USDFLD with subroutine CREEP via .inp file

 

Hello
I am trying to evaluate a field in the domain using USDFLD. Field variable dependent is defined by CREEP subroutine. I had written a input (.inp) file for modelling. I have attached the inp and subroutine file in the mail. During simulation, a warning comes 

The *user defined field option has been used, but there are no user-defined fields active in the model. User-defined fields may be activated by the *field or *initial conditions,type=field options or by defining materials with field variable dependencies.

Due to this warning USDFLD subroutine doesn't work even I am trying to get print but it is not working. Please help to resolve the issue. 

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Von mises at the mid-surface of shell element

 

Hi All,

I want to report the Von Mises stresses at the mid-thickness of the Shell element. Anyone knows how?
The Abaqus just shows the Von Mises at the top and bottom surface (SP-1 & SP-5).


Thank you,
Diana
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Posted by: Diana Abdulhameed <dabdulha <at> ualberta.ca>
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ounaies_m@yahoo.fr [Abaqus] | 18 Jul 11:33 2016
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introducing constant tempreture in a mass diffusion step

 

hello ,

I want to introduce a  constant temperature  in a model of masse. Diffusion model must change of pace with the changes of the tempreture introduced.

I introduced the temperature under predifined field but it did not work.

How can I change the model according to the temperature?

n>

thank you


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Umat + quadratic elemnts

 

 Hi all,

I use a damage plasticity UMAT for concrete, when i use linear C3D8R i have no problem and i can obtain the results, however when i use Quadratic elements i have a strange problem , the run is start and it never stops,   any  ideas please?

if i have problem in my Umat , why it is not shown using linear elemnts??

Regards,
Zarin



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abu12382@yahoo.com [Abaqus] | 17 Jul 00:06 2016
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visulization results

 

Hi...

 what is the difference between the three types of ABAQUS animation (scale factor , harmonic and  time history) ?


Thanks in advance,


 

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Regarding boundary condition in simple 2D plate in plane stress condition above yield point

 

Hi,

I am solving a problem of 2D plate in plane stress condition. A pressure is applied on the top edge in Y direction and nodes on lower edge are constrained in Y direction. when the loading is such that the maximum stress in plate is below yielding limit then the problem is independent of the node constrained in X direction i.e. lower left corner or lower right corner and get converged.

But when the loading is increased and make the maximum stress in plate above yielding stress. The solution will not converge by constraining lower left corner, lower right corner, upper left corner, upper right corner and both lower corner. By constraining both upper corners solution will converged. But this will change the problem statement.

The same model is working fine with displacement control condition.
  Can you please guide me where i am making the mistake.


Thanks 

Manish Kumar


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Resume/restart the analysis due to sudden electricity power failure

 

Dear all

Currently i am running Simulations that can take up to two to three days to complete. But if there is any interruption due to electricity power failure and computer is turned off then how can i "Resume" or "Restart" analysis on the same point/iteration again where analysis was terminated due to sudden power failure?

Thank you very much for your time and Response
Best regards 
Dr. Hassan Ijaz
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XFEM quick question

 

Dear All,

I am modeling hydraulic fracturing test for in situ stress measurement in clay shale (small scale with limited injection fluid) using XFEM method. before injection the fracturing fluid into the test interval, I have two cycles of sleeve fracture (pressuring packer, like pressuremeters or dilatometers to create a tensile crack and prevent any premature fracturing at the packer level during the HF test), now my question is when I apply the packer pressure on the test interval as distributed pressure or concentrated force (I tried both), I could not see displacements of test interval or induced stress though I have 25 and 26 MPa for the fist and second cycle respectively. How can I get the displacement/induced stress applied on the same test interval for hydraulic fracturing before the injection the fluid into the test interval for hydraulic fracturing?

It would be highly appreciated if you share your experience/idea for solving this problem, Thanks in advance.

--

Regards,
 
Nadia

 

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Posted by: Nadia Shafie Zadeh <shafieza <at> ualberta.ca>
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Gmane