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Which material has to be used in linear static analysis, plane stress case, of a plate?


I have to do Linear static structural analysis, plane stress case, of a plate with constraints applied at one edge and pressure applied at the opposite edge. Temperature load also applied to the whole body.   I tried two approaches


1. Used PSHELL type and CTRIA6 element and applied equivalant force on the edge, no option in NX to apply pressure  on polygon edge in this case.


2. Used PPLANE type and CPLSTS6 element and applied pressure on edge.


In the second case I am not getting reasonable results, its giving thermal expansion in X direction as two times of thermal expansion in Y direction. Why?

 Which element I have to use?

I am using NX V9.0