Experimental Verification of the J Ic and Equivalent Energy Methods for the Evaluation of the Fracture Toughness of Steels

摘要: The critical value J 1 c and the apparent fracture toughness K B d are measured with a single small specimen (compact tension or three-point-bend bar) loaded in elastic-plastic range. Initiation is detected during loading by an electrical potential method. For steels studied here (2.25Cr-lMo, electroslag weld, manganese cast steel), values deduced from agreement directly thick specimens transition-temperature Furthermore, equivalent energy procedure gives same results as those obtained J-integral