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Possible methods for evaluating J for a three-point bend specimen are reviewed and the effects of slow crack growth, experimental limit load, and lateral constraint noted. A procedure, compatible with linear elastic fracture mechanics (LEFM) and crack opening displacement (COD) testing, is suggested for finding Jc.
crack propagation, fractures (materials), mechanical properties, tests, J-contour integral, linear elastic fracture mechanics, crack opening displacement
Senior scientific officer, Naval Construction Research Establishment, Dunfermline,
Professor, Materials in Mechanical Engineering, Imperial College, London,