how can the cooling process change the stress relaxation?

[benutella]

Hello,Jorgen

i am working about the stress relaxation problem when considering the cooling process

my model is ok when i did not consider the cooling process, but if i define the cooling rate for stress relaxation, the stess relaxation behaviour seems quite strange: it looks like a bath curve, at start the stress is decreased then it goes to a negative value, at last it goes to positive again

what is wrong?

Thanks a lot!

[Jorgen]

I do not quite understand your question. Can you give the specifics of your stress relaxation and cooling process? What temperatures, deformation rates, etc, did you apply?

Jorgen