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Dear all,

I am working on micro mechanical modeling of metals. I just have some questions that I am wondering if anyone can help me by answering them.

1. I know that for cohesive element , it is important to have the match meshes in boundaries of the surfaces but my question is that is it also important to have match meshes in boundaries when we define surface base cohesive? 

2. can any one tell me that how I can find the the values that I need to define cohesive surface? I mean:

Dear all,

I want to define cohesive surface in my model which is a polycrystalline of Titanium with its grains. Can anyone help me that How I should find the appropriate values for fracture energy and mode mix ratio 1 and 2?

For damage initiation, what do I consider for normal, shear 1 and shear 2 in contact property of interaction module? Are Tensile and shear strength suitable for these properties?

Thank you