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Stress Output Using Thick Shells with Plasticity

The plasticity formulation used for the thick shell element suit is based on a "plane stress" assumption (i.e. sz=0), giving the usual stress output of

sx  sy  sxy  syz  szx

Because of this assumption, the element is not able to use the classical plasticity algorithms available for three dimensional solid elements (the missing stress, sz  being the main problem). The plasticity formulation used for these elements, therefore, only uses the stress terms

sx  sy  sxy

and ignores the transverse shear terms, assuming them to remain elastic (a reasonable assumption in the general case).

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