The APDL Materials Reference gives the example input below for temp-dependent bilinear isotropic hardening. You appear to have only specified the yield stress. Perhaps a shell element isn't the best choice for a plasticity analysis. Perhaps a thin solid with several elements through the thickness would be more accurate. Â
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MPTEMP,1,0,500 ! Define temperatures for Young's modulus
MPDATA,EX,1,,14E6,12e6
MPDATA,PRXY,1,,0.3,0.3
TB,PLAS,1,2,,BISO ! Activate a data table
TBTEMP,0.0 ! Temperature = 0.0
TBDATA,1,44E3,1.2E6 ! Yield = 44,000; Plastic Tangent modulus = 1.2E6
TBTEMP,500 ! Temperature = 500
TBDATA,1,29.33E3,0.8E6 ! Yield = 29,330; Plastic Tangent modulus = 0.8E6
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