User Area > Advice
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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