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Methods for J-integral fracture toughness testing are new and, therefore, not well established. Compliance methods developed by Begley and Landes provide accurate data but require extensive specimen testing and analysis. Estimation procedures that allow the calculation of Jc from a single test are convenient to use but are of unknown accuracy. In order to compare these two techniques, compact tension specimen test data from seven alloys were analyzed by both methods. A comparison of the results showed that estimated values of Jc by the Rice, Paris, and Merkle equation agreed best with compliance data when a/w > 0.75 but always tended to underestimate Jc. An equation derived from an improved analysis by Merkle and Corten tended to overestimate Jc.
crack propagation, fractures (materials), cracking (fracturing), crack initiation, fracture tests, toughness, mechanical properties, loads (forces)
Member of the technical staff, Physical Metallurgy Division 5835, Sandia Laboratories, Albuquerque, N. M.