Fracture of Flat and Curved Aluminum Sheets With Stiffeners Parallel to the Crack

[+] Author and Article Information
J. Frisch

University of California, Berkeley, Calif.

J. Basic Eng 83(1), 32-38 (Mar 01, 1961) (7 pages) doi:10.1115/1.3658887 History: Received June 04, 1959; Online November 04, 2011


The mode of crack propagation and failure in relatively large 2024-T3 aluminum sheets reinforced with stiffeners parallel to the crack direction has been investigated. Curved specimens with a 69-in. radius of curvature as well as flat panels were subjected to uniaxial tension perpendicular to a simulated crack to study the effects of curvature, crack location, and stiffener spacing. Increase in strength due to stiffening particularly in the curved panels was observed although these specimens exhibited considerable lower crack strength than flat ones. For the specimens tested, crack location as well as variations of stiffener spacing from 3 to 12 in. had no appreciable effect on either critical crack length or failure stress.

Copyright © 1961 by ASME
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