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Implementing failure strain to material models

Implementing failure strain to material models

Implementing failure strain to material models

(OP)
Hello everyone,

does anyone have experience to define a failure strain, so that after reaching this strain the shell element is deleted from the calculation?
I am using the material model MAT24 Piecewise_Linear_Plasticity in LS-DYNA wehere I can define a "strain to failure". But I am not sure which value I should apply.

I thought of the following possibilities:

-Using the point where necking accours, which would be rather pessimistic
-Using the failure strain, although it is calculatied looking at the reduction of the diameter of a test specimen: e_f=ln(A0/AF)
-Using the elongation at break, which seems logical. The problem is that most manufacturer are providing only minimum values, e.g. 6% for AA6060 T6, which again would be quite pessimistic.


I hope that someone can help me with my problem!


Regards

Ed93

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