Abstract
The objective of this portion of a sponsored program [1, 2] was to determine the effects of specimen configuration and testing variables on the crack propagation properties of three high-strength, sheet materials at room and cryogenic temperatures in order to help establish standards for fracture toughness testing. The test program consisted of determining the crack propagation properties of cold-rolled types 301 and 310 stainless steels and 2014-T6 aluminum alloy at 75°, -320°, and -423°F using center-notched, sheet tensile specimens. Basic fracture properties were obtained for both the longitudinal and transverse directions using 4-in.-wide test specimens. In addition, tests were performed to determine the effect of specimen width, notch length, specimen thickness, and loading rate. Repeated loading tests were also performed on 18-in.-wide specimens of all three alloys to determine the effect of fatigue loading as compared to static loading. A brief discussion of fracture concepts and definitions of terms and equations used in fracture-mechanics studies are presented in the following paragraphs to clarify the discussion of test results.
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