The maximum stress criterion; Damage initiation of the fiber; VUMAT
Dear every friends,
I am working on VUMAT coding to define the damage initiation of a single fiber. Is it OK if I use the maximum stress criterion? That is:
-Xc<S11<Xt, -Yc<S22,S33<Yt, -FSh<S12,S13,S23<FSh
Where Xt and Xc are tensile strength and compressive strength in the principle direction, respectively;
Yt and Yc are transversely tensile strength and compressive strength, respectively;
and Fsh is Shear Strength
I would really appreciate it if you could give me some advice and suggestions. Thank you in advance.