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Mat_54_55 (LS DYNA material model)

I would like to know the difference between Effective Strain, Effective Plastic Strain and Effective Failure Strain.

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Effective strain is also called true strain. Phsically, it is represented by the stress over the net area. 

Effective plastic strain is related to J2-plasticity. Mathematically, it is equal to Sqrt (2.0*eps(d)*eps(d)/3.0) , where eps(d) is the deviatoric strain.

Effective failure strain  is the effecive strain at failure (or peak stress).

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