Abstract
Comparative tests in air and seawater were conducted to investigate the effect of environment on retardation by peak overloads in 2024-Al alloys. The seawater could either increase or decrease the amount of retardation, depending on the R-ratio used. This effect is ascribed to the competitive influence of straightforward environmental growth acceleration and retardation due to corrosion product wedging. Shear-lips give rise to asymmetrical plastic zones and deviation in the crack path. Cracks in single shear show more retardation than cracks in double shear.
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