Sir,
I want to ask you a question,
I debug a constitutive model about the cohesive element in ABAQUS.
You know the key point of this element's constitutive model is Traction-Seperation Relationship.
I want to test my model by Umat, not the Uel.
So I want to ask whether Stran is the relative displacement(not strain) of the Gauss point in this type element.
And how Dstran is calculated by UEL subroutine!!!