Microstructure dependent fatigue crack growth in aged hardened aluminium alloys

Content Provider	Semantic Scholar
Author	Borrego, Lucía Prieto Costa, Jose Martim Silva, Severiano Ferreira, J. M.
Copyright Year	2004
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.
Starting Page	1321
Ending Page	1331
Page Count	11
File Format	PDF HTM / HTML
DOI	10.1016/j.ijfatigue.2004.04.004
Alternate Webpage(s)	https://estudogeral.sib.uc.pt/bitstream/10316/4249/1/file848a8de7e07448f9a05932e08bfa39fe.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.ijfatigue.2004.04.004
Volume Number	26
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article