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Difference between stress values whne changing from Plastic to Nlelast material type

Hello,

This topic has been launched in a way in the past.

I am performing a 106 solution, using two materials for which I have defined two [material] curves. If I use for the two materials type Plastic, the stresses (not Von Mises) are significantly bigger that the last stress value on the curve (the last value is 460 MPA, and one Sigma if more than 600 MPa. If I use Nlelast material type, the values are around 410 MPa. I cannot understant why. The only difference between studies is the material type (plastic, or nlelast).

Many thanks

Ionut