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The continuum tangent matrix for plastic flow

Substituting Equations 33 and 20 into Equation 7 gives the continuum tangent matrix,


For isotropic elasticity,


which allows the elasto-plastic tangent matrix to be simplified to


where C is the standard linear isotropic elasticity matrix. This tangent is only used when there is plastic ow, and the elastic tangent is used otherwise.

djb 2005