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Using dynamic loading at K rates of 104 ksi in ½/s, fracture toughness tests were made on annealed, and normalized and tempered A302-B steel at temperatures from -320 to 125 F. Fatigue precracked compact tension specimens were used. The specimens were separated into two groups with one group fatigue precracked under a higher load level than the other. Higher fracture toughness values were obtained for the specimens precracked at the higher load. Dynamic KIc values determined in this investigation were lower than static KIc values for the same material as reported earlier by another investigator.
fractures (materials), fracture properties, dynamic tests, toughness, strains, steels, fatigue tests, evaluation
Senior engineerPersonal member, Materials Testing and Evaluation Laboratory, Westinghouse Research LaboratoriesASTM, Pittsburgh, Pa.