Stress at particular strain

[feaplastic]

Hello users,

How to get stress values at particular strain or displacement like 5%, 10%, 15% and so on.

In my compression analysis, i get results randomly.

I use abaqus CAE.

Thanks for your time and help.

Regards,

feaplastic

 

[corus]

If the analysis is within the elastic regime and the geometry is not non-linear then the results will be directly proportional to your input displacement Otherwise you'd have to plot the stresses as the displacement increased.

I have no idea how you can get apparently random results from a model.

corus

 

[sendy]

Hi feaplastic,

I am not sure that I can exactly understand your question. But users can obtained the evolution of the stress/strain at particular integration point of an element from either history or field data.

Ehm... what do you mean by random results ?

regards.

 

[louisa]

I think you may control your increment size.

 

[Yoman228]

as Louisa said, decrease the increment to a smaller time by fixing the minimum increment time to a small value

 

[feaplastic]

Hello,

random results means - i get stress results at 3%,7%,11% ... strain.

But i need, exactly at 5%, 10%,.. and so on.

I tried minimizing time increment. But, no success.

I have non-linear geometry on and material curve also highly non-linear.

I read somewhere, it is possible only for linear analysis.
For non-linear, it must be extrapolated from existing values.

is it true?

Thanks for time and help. Excuse me for late reply.

feaplastic

 

[Yoman228]

What u need to do is to fix the maximum increment size to a very small number and hope that your stress results will fall closely to the strain u want.

 

[mizzjoey]

hi feaplastic.

If you mean that you wish to display the strain plots at 5%, 10% etc, you can go to the contour options and change the limit from auto compute to 5% (or whichever strain value you like).

You can try what Yoman suggested, but with non-linear material it is really unpredictable and you will lengthen solution time. You can make displacement/load/temp increase ramp as you like by editing increment specs, but strain is a behavior dictated by inherent material property.

That's all I can offer. Hope this helps.

regards,
jo