The stress strain curve has zero slope beyond the yield point. BPV code defines exactly what values to use for this yield point. Some of the stresses in the FEM appear to be slightly higher than the yield stress, but these resulting stresses and strains have no real physical significance. This...
No, limit load allows some stress to go above yield. As some areas of the vessel yield, that portion of the load shifts elsewhere. Only when there is no longer enough material below yield does the vessel fail.
So for protection against plastic collapse, I can use BISO or BKIN but with NLGeomtry OFF. For ratcheting, I use BKIN with NLGeometry ON. Correct?
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Which material model in Ansys should be to create an elastic-perfectly-plastic material model for use in limit load analysis (ASME BPVC Sec VIII Div 2)?
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