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Hello everyone,
I have created a UMAT code for J2 elasto-plasticity with isotropic hardening for 3D solid elements.
At this point I would like to support also plane stress shell elements. What changes in the code are
suggested? The already implemented code, takes as input the strain tensor at time tn and the strain
increment tensor and updates the stress at time tn+1 and calculates the material Jacobian and
achieve quadratic convergence. The stress and strain tensors are manipulated as 6x1 vectors and the
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