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RESEARCH PAPERS

Fracture Mechanics Parameters for a 5083-0 Aluminum Alloy at Low Temperatures

[+] Author and Article Information
R. L. Tobler, R. P. Reed

Cryogenics Division, Institute for Basic Standards, National Bureau of Standards, Boulder, Colo.

J. Eng. Mater. Technol 99(4), 306-312 (Oct 01, 1977) (7 pages) doi:10.1115/1.3443545 History: Received January 31, 1977; Revised April 18, 1977; Online August 17, 2010

Abstract

The fatigue crack growth and fracture resistance of a 5083-0 aluminum alloy plate were investigated at four temperatures in the ambient-to-cryogenic range—295, 111, 76, and 4 K. J-integral test methods were applied using compact specimens 3.17 cm thick, and the value of J required to initiate crack extension (JIc ) is reported as an index of fracture toughness. The fracture toughness was orientation dependent, with anisotropy accounting for JIc variations of up to a factor of 2. For specimens having fracture planes parallel to the rolling direction, JIc increases progressively from 9 to 25 kJm−2 as temperature decreases between 295 and 4 K. In contrast, the fatigue crack growth rates (da/dN) are insensitive to specimen orientation. The fatigue crack growth rates at cryogenic temperatures are up to 10 times lower than in air at room temperature, but are virtually constant between 111 and 4 K.

Copyright © 1977 by ASME
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