Effects of Lamination and Changes in Layer Thickness on Fatigue-Crack Propagation of Lightweight Laminated Metal Composites

摘要

The effects of lamination and changes in the laminae thickness on the fatigue-crack propagation of 6090/SiC/25p-6013 laminates tested in the crack-arrestor orientation were investigated. The fatigue-crack propagation behavior of the individual monolithic and discontinuously reinforced aluminum alloy (DRA) layers was compared to that of the laminates. The fatigue behavior of the laminates was different than that of the individual laminae and was affected by changes in the layer thickness. In-situ monitoring of fatigue-crack growth and postmortem analyses were used to determine the likely source(s) of the layer-thickness effect and differences between the laminated metal composites (LMCs) and its constituents.