How can I find mode II fracture toughness from iosipescu test? Any equation?

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Iskandar Vasiev

This thesis has a method of estimation and equation: http://etd.library.vanderbilt.edu/available/etd-09112008-120158/unrestricted/Krishnan_Arun_MS_Thesis.pdf

Jamal Jamali

Thank you very much Iskandar. It gives a suggestion for calculating KII, however it does not have an exact value for C in equation KII=C.sigma.(pi.a)^0.5