Effects of variable amplitude loading on fatigue crack propagation behaviour of microcracks in Al-Zn-Mg-Cu alloys

被引：1
|
作者：
Suzuki, M [1 ]
Peters, JO [1 ]
Lütjering, G [1 ]
Gysler, A [1 ]
机构：
[1] Tech Univ Hamburg Harburg, DE-21071 Hamburg, Germany
来源：
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3 | 2000年 / 331-3卷
关键词：
Al alloy 7475; Al alloy X-7075; Al alloys; fatigue microcrack propagation; macrocrack propagation; overload effects; slip distribution; S-N curves;
D O I：
10.4028/www.scientific.net/MSF.331-337.1543
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fatigue crack propagation behavior of self-initiated microcracks was studied in air for the commercial Al-alloy 7475 and a high-purity X-7075 alloy, both in an underaged condition. A comparison was made between constant amplitude tests and tests with periodically applied tensile overloads superimposed on constant amplitude cycles at R = 0.1. The number n of intermittent baseline cycles between consecutive overloads was varied between 100 and 1000. The fatigue crack growth resistance increased significantly for both alloys with increasing numbers of n as compared to crack growth rates under constant amplitude loading. The results are explained on the microscopic variations of the fracture surface appearance as a result of overload enhanced changes in slip distribution in the plastic zone at the crack tip.
引用
收藏
页码：1543 / 1548
页数：6
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