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Can elasto-plastic stiffness matrix be unsymmetric?

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ananan88

ananan88

Civil/Environmental
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Apr 12, 2004
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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?
 
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Generaly yes. Elastoplastic problems are generaly non-linear, especially whwn hysteresis is considered.
 
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