How to change integration points numbers for solid and shell element in OptiStruct?

Hi 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. 

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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

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