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Using LEFM for analyzing crack in a non linear material

Submitted by vivekiitm8 on
research
linear elastic fracture mechanics

Dear all,

I am trying to find the crack tip SIF in Polyurethane which an elastomer. It behaves like a nonlinear elastic material with the initial small linear elastic region. Can I use a multi-parameter stress field equation (William's crack tip stress field equation) to get the SIF of the crack tip.

Thank you