Abstract
Some of the procedures available for considering the fracture behavior of structural aluminum alloys in design are described. For the higher strength aluminum alloys, particularly when used in fairly thick sections, plane-strain fracture-toughness concepts are useful; values of the critical plane-strain stress intensity factor, K 1c are summarized and typical values and ranges of expected values are presented. For highstrength alloys in relatively thin sections, and medium-strength alloys in thicker sections, a thickness-related K c approach seems to have merit; representative values of K c are presented for a range of thicknesses of some alloys. For the lower strength, very tough alloys or for relatively mild stress raisers, the results of tests of small structural assemblies are relied upon; the results of tensile tests of single- and double-angle members are presented as an illustration of this type of analysis.
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