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Effects of high temperature and thermal exposure on fatigue crack propagation of laminated metal composites

Abstract The effects of changing the test temperature from room temperature to 373 or 398 K on the fatigue crack propagation of 6090/SiC/25p-6013 and 7093/SiC/25p-7093 laminates tested in the crack arrestor orientation was investigated. The fatigue crack propagation behaviour of the individual monolithic and discontinuously reinforced aluminium alloy (DRA) layers was additionally compared to that of the laminates. The fatigue behaviour of the laminates was significantly different than that of the individual layers and was affected by changes in the test temperature as well as by a thermal exposure to high temperatures (e.g. 373 or 398 K) before testing at 298 K. Significant changes in the crack velocity also occurred upon traversing from one layer to another for the fatigue tests conducted at high temperature, or after exposure to high temperature.