Pressure stress and misses equivalant stress?

[dariushtari99]

Hi
i want to know,how to define Pressure stress and misses equivalant stress?What kind of material tests should i do in order to define them?
Dariush

 

[Yoman228]

Not sure if I have understand your question correctly.
what kind of material and type of analysis you working with? You expecting it get plastic?
It depends on how deep you want to get into.
If it is normal stress analysis with steel, I would say tensile test will do or even get some standard value from web.
If it is linear elastic analysis for steel, Young module's is 207GPa with passion ratio of 0.3

 

[dariushtari99]

Dear yoman
I paste the complete question again here.Thank you so much for your attention.

For defining A Ducatile Damage initiationas 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 you 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?
My material is steel and the material model would be Elastic-plastic which i obtained from a tensile test.
Dariush