Learning Forum

[manuel.uruena]

I am modelling a steel material with MISO by strain-stress points with TB,PT in Mechanical APDL.

According to APDL, I cannot start the input data with a first point of 0 strain and 0 stress, but the first point must 0 strain.

I have also read that the first segment of the multilinear curve is taken as the Young modulus, and that no segment must be larger.

What first point should I introduce? A first point such as 0 strain 0,1 stress or a 0 strain 400MPa stress?

[Erik Kostson]

Hi

See chapter material reference, rate independent plasticity - so in apdl material reference it is ch. 4.4.

All the best

Erik

[manuel.uruena]

Dear Erik Yes, I have read the chapter. The chapter says that "multilinear hardening behavior is described by a piece-wise linear stress-total strain curve, starting at the origin" but what it does not say is that you cannot start at the origin of the multilinear curve (0 strain, 0 stress) when giving points by the command TB,PT (ansys error).
The chapter also says that "The first stress-strain point corresponds to the yield stress", but what it does not say is that the first point must have 0 strain (otherwise, ansys error). How do you define then the Young modulus?
Thus, I find the chapter confusing and I ask for clarification in my post.
Thanks