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Following tests carried out on compact tension [C(T)] specimens in AISI 316H steel, the engineering approach (EA) of Shih et al. and the key curve method (KC) of Ernst et al. were used to calculate, from the obtained load-displacement records, the crack extensions that took place. A method to define unambiguously the strain hardening exponent entering the EA estimation procedure is outlined. This gave satisfactory predictions of the load-displacement levels encountered in the tests. As a consequence, a calibration function, required in the KC analysis, could be elaborated. Both methods yielded final crack extensions that agree within 15% with the measured ones. The estimated values thus remain within the generally accepted maximum allowable errors.
elastic-plastic fracture mechanics, calculation of crack extensions, key curve analysis, stainless steel, nonlinear fracture mechanics, fracture mechanics
Senior officer, Commission of the European,