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tangent modulus plasticity - von mises question

Question asked by Scott Nelson on Oct 25, 2016
Latest reply on Nov 23, 2016 by Sam Ingram



I've defined a custom material, nylon6 30%gf using data from the supplier for  a non-linear study in simulation professional.  After defining the 23deg. s/s curve I receive the following warning that I'm unfamiliar with:


The tangent modulus was found higher than (or equal to) the elastic modulus in the stress-strain curve definition. Would you like to stop the solver and check the data input? Otherwise, the solver will ignore the invalid data and only keep the ones with the tangent modulus lower than the elastic modulus.


Is this a simple warning based on the fact that the stress comes down from it's peak at the highest strain percentages?