SEDL / STP / STP868-EB / STP34269S

Crack Arrest Behavior of a High-Strength Aluminum Alloy

Lin, C
Research Associate and Associate Professor, The Ohio State University, Columbus, OH

Hoagland, RG
Research Associate and Associate Professor, The Ohio State University, Columbus, OH

Pages: 23    Published: Jan 1985

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Abstract

This paper reports on a series of crack arrest tests on two lots of 7075-T651 high strength aluminum alloy. The tests were performed and the data analyzed in accordance with procedures developed for high toughness, medium strength steels. Both K^ID and K^Ia are reported and the results show that these crack arrest parameters behave considerably differently than in the case of medium strength steels. Problems with specimen size requirements, fracture mode transitions, and generation of unbroken ligaments were not factors affecting the present results; their absence may, at least in part, account for these differences. Also, the strain-rate sensitivity of the flow strength of this aluminum alloy is considerably less than that of ferritic steels and this may also be important.