How should change friction angle with plastic strain? (Mohr-Coulomb)
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Use total plastic strain and Cauchy for 3D
strain=sqrt(0.5*(pe11-pem)^2+0.5*(pe22-pem)^2+0.5*(pe33-pem)^2+pe12^2+pe23^2+pe13^2)
pem=(pe11+pe22+pe33)/3
for explixit pe23=array(5) and pe13=array(6)
for implicit pe23=array(6!) and pe13=array(5!)*
for plainstrain: pe13 and pe23 do not exist
*
for explicit vgetvrm gives you e12,e23,e13
for implicit you maybe get y12,y13,y23: you have to check this