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Critical Fracture Energy for Mode I ,& Mode II

Hi all.

I have known some mechanical properties of a material which are:

Young Modulus

Shear Modulus

Strength in shear

Strength in tension

Strength in compression.

I'd like to estimate (in order to run an ABAQUS cracking propagation analysis using XFEM) the material parameters which are Gc(I),GcII (critical fracture energies), and the softening law.As i tend to choose a linear law i have to know also the displacement where stress goes to zero.

All i have are the above mentioned mechanical properties.

Any ideas?

Thanks in advance

Ilias

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