Hello Gopikrishna,I think I actually have the same problem you have once regarding the constant of norton law. nYou wrote that you find another way to identificate the constants. Can you please tell me how you did it?.I got creep test data deformation vs. time or creep strain vs. time. nI tried to fit the creep curve in APDL (Norton) but it doesnt worked. Error during solution. Only Modified Time Hardening and Generalizied Time Hardening worked. But with the constant of these creep law - the simulation doesnt converge.nnMaybe you can help?nThanks in advance.n