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how to obtain Ductile damage initiation inputs?

how to obtain Ductile damage initiation inputs?

how to obtain Ductile damage initiation inputs?

(OP)
Hi does anybody has Experience in defining A Ducatile Damage initiation?Well as input data it requires Equivalent fracture strain at damage initiation and Stress triaxiality,which is a devision of Pressure stress and misses equivalant stress.I was wondering if anyone could explain how to obtain each of these inputs?I mean, they are somehow related to Material behaviour,right?
So which Material tests should i perform on my part,in order to be able to obtain these datas?
thank you
Dariush

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