Hi Helen,
Try the following commands for the material input. The commands below define a multilinear isotropic hardening model where for temperature of 66 degree C, the plastic strain is zero and stress is 1e-6MPa. Other data is for 22 and 44 degree C.
TB,PLAS,1,3,3,MISO
TBTEMP,22
TBPT,,0,100
TBPT,,0.1,200
TBPT,,0.2,300
TBTEMP,44
TBPT,,0,100
TBPT,,0.1,200
TBPT,,0.2,300
TBTEMP,66
TBPT,,0,1e-06
Regards,
Ashish Khemka