Hi,

I am using Johnson Cook strength model to simulate steel. I am interested in updating my Johnson Cook strength parameter "A " using a field variable as (residual strain). My intention is to obtain the plastic strain in subroutine VSDFLD and calculate the residual strain using plastic strain. I store the residual strain in field variable FV1.

Hence I need to provide plastic property dependencies in my input file as

*Plastic, hardening=JOHNSON COOK

** A, B, n, m, Tm, Tc, FV1

2e+07, 1.554e+08, 0.34, 0.912, 1520., 900.,

However I am unable to add field variables as FV1 to Johnson cook model using CAE.

For an plastic material with isotropic hardening I can add a field variable in CAE as

*Plastic, hardening=Isotropic, DEPENDENCIES=1

** Yield Stress [MPa], Plastic Strain, FV1

198.8e+03, 0.01, , 0.00000

172.4e+03, 0.02, , 0.01793

168.7e+03, 0.03, , 0.03942

166.8e+03, 0.04, , 0.06155

167.2e+03, 0.05, , 0.08409

166.8e+03, 0.06, , 0.10747

I know this can also be achieved using UMAT. However is it not possible to modify the Johnson Cook parameter using the subroutine VSDFLD? Or is there a different method that I need to use.

Thank you