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One of the more troublesome parts of conducting a plane-strain fracture toughness test in accordance with ASTM Test for Plain Strain Fracture Toughness of Metallic Materials (E 399-72) is producing a satisfactory fatigue crack in the specimen prior to fracturing it. The 1968 version of ASTM E 399 indicated that the stress intensity during the last stage of fatigue cracking should not exceed 0.0012 in.½ E (modulus of elasticity) or 0.5
fracture properties, cracks, aluminum alloys, fracture strength, tests, modulus of elasticity, tests precracking
Kaufman, J. G.
Manager, Aluminum Company of America, New Kensington, Pa.
Schilling, P. E.
Engineer, Aluminum Company of America, New Kensington, Pa.