期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 26, 期 12, 页码 1321-1331出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2004.04.004
关键词
aluminium alloys; fatigue crack growth; retardation; microstructure; crack closure; overloads
Fatigue crack propagation tests in constant amplitude loading, as well as with single peak overloads, have been performed in AlMgSil-T6 aluminium alloys with different Mn and Cr contents. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. A moderate stress ratio and a strong material dependence effects on the fatigue crack growth were observed. These effects are discussed in terms of the different dominant closure mechanism (plasticity-induced closure or roughness-induced closure). Roughness-induced closure dominates crack closure in the alloys with higher contents of Mn and Cr elements. In the alloy with a lower content of these elements, plasticity-induced closure is dominant. When roughness-induced closure is the prime pre-overload closure mechanism, the retardation effect is decreased in comparison to when plasticity-induced closure is dominant. (C) 2004 Elsevier Ltd. All rights reserved.
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