How to change integration points numbers for solid and shell element in OptiStruct?
Altair EmployeeHi all,
From the FEM theory, an element can have different number of integration points, however I don't know how to set up this in OptiStruct for shell and solid element.
I tried different 'ISOP' value in PSOLID card as Prakash Pagadala mentioned, however I found the stress result are exactly the same no matter how the ISOP parameter in PSOLID card values. Therefore, I don’t think the value of ISOP can change the element integration points. What’s more, from the manual of PSOLID card, the ISOP parameter is a special integration schemes for elasto-plastic nonlinear quasi-static analysis. But my example is a linear static analysis.
<?xml version="1.0" encoding="UTF-8"?>
So how to change the element integration point formulation in OptiStruct for linear static analysis? I think this is a fundamental set up for finite element analysis.
The model and the pdf file shows detail result.
Roy
Answers
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Hi Roy,
If you go to the old post I mentioned that ISOP will only work for quasi static analysis (NLSTAT) with elasto plastic material, so your results may not be valid for a linear static case.
From OptiStruct help I can make a conclusion that for a linear static analysis only fully integrated solid element exists. For Cquad4 elements 5 integration points are utilized.
But you can change the scheme of output using location on STRESS output.
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Altair Forum User said:
Hi Roy,
If you go to the old post I mentioned that ISOP will only work for quasi static analysis (NLSTAT) with elasto plastic material, so your results may not be valid for a linear static case.
From OptiStruct help I can make a conclusion that for a linear static analysis only fully integrated solid element exists. For Cquad4 elements 5 integration points are utilized.
But you can change the scheme of output using location on STRESS output.
Hi Prakash,
Could you please tell me where can I find these default element integration points message? I want to know the default element integration points for different element types in different analysis. Thank you.
<?xml version="1.0" encoding="UTF-8"?>
Roy
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Is there anyone know where can I find this message? Thank you.
Roy
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Hi Roy,
Please see the help section for CQUAD4 elements.
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Altair Forum User said:
Hi Roy,
Please see the help section for CQUAD4 elements.
Hi Prakash,
I have read CQUAD4 and pshell element help, however I have not found any message about element integration points message. Could you show me more detail? Thank you.
Roy
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Hi Roy,
PFA,
<?xml version="1.0" encoding="UTF-8"?>
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When you look the stress distribution into shel element with Optistruct. Shell elements in Optistruct have only one integration point. Impossible to get full integration. It's why you'll find difference in stress distribution when you compare to ANSYS
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