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Can elasto-plastic stiffness matrix be unsymmetric?

Can elasto-plastic stiffness matrix be unsymmetric?

Can elasto-plastic stiffness matrix be unsymmetric?

(OP)
I think elasto-plastic stiffness matrix will be unsymmetric when yielding function and plastic potential function are not the same one. Am I right?
If it is true, how to solve the equations in nonlinear finite element anasysis?

RE: Can elasto-plastic stiffness matrix be unsymmetric?

Generaly yes. Elastoplastic problems are generaly non-linear, especially whwn hysteresis is considered.

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