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Title: Microstructure dependent fatigue crack growth in aged hardened aluminium alloys
Authors: Borrego, L. P. 
Costa, J. M. 
Silva, S. 
Ferreira, J. M. 
Keywords: Aluminium alloys; Fatigue crack growth; Retardation; Microstructure; Crack closure; Overloads
Issue Date: 2004
Citation: International Journal of Fatigue. 26:12 (2004) 1321-1331
Abstract: Fatigue crack propagation tests in constant amplitude loading, as well as with single peak overloads, have been performed in AlMgSi1-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.
DOI: 10.1016/j.ijfatigue.2004.04.004
Rights: openAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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