Dear all,
I am conducting to write a umat for simulating 2D or 3D beam. I am confused with DDSDDE of Umat.
Actually, as we know, we must define a 6*6 matrix for 3D Solid element.
I was wondering which kind of matrix should we define for beam element. 2*2 or 3*3?
I have define a 3*3 ddsdde...