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In recent years the problem of brittle fracture has been one of great importance to fabricators of solid-propellant missile-motor cases, and many tests have been developed to determine the “fracture toughness” of sheet materials as a measure of their resistance to rapid crack propagation (1). After studying many of the tests proposed for the evaluation of fracture toughness, a special ASTM committee recommended the center-notch tension test for the screening of materials in laboratory tests (2).
Sheehan, J. P.
Armour Research Foundation, Chicago, Ill.
Manning, R. D.
U. S. Steel Corp., Applied Research Laboratory, Monroeville, Pa.