SEDL / STP / STP466-EB / STP32066S

Dynamic Fracture Toughness Tests on A302-B Steel

Bush, AJ
Senior engineerPersonal member, Materials Testing and Evaluation Laboratory, Westinghouse Research LaboratoriesASTM, Pittsburgh, Pa.

Pages: 22    Published: Jan 1970

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Abstract

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 K^Ic values determined in this investigation were lower than static K^Ic values for the same material as reported earlier by another investigator.