The microstructure and environment influence on fatigue crack growth in 7049 aluminum alloy at different load ratios

被引：0
|
作者：
Fonte, MA
Stanzl-Tschegg, SE
Holper, B
Tschegg, EK
Vasudévan, AK
机构：
[1] Univ Agr Sci, Inst Met & Phys, A-1180 Vienna, Austria
[2] Naut Sch, P-2780572 Paco De Arcos, Portugal
[3] Vienna Univ Technol, Inst Appl & Tech Phys, A-1040 Vienna, Austria
[4] Off Naval Res Lab, Arlington, VA 22217 USA
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2001年 / 23卷
关键词：
fatigue crack growth; near-threshold fatigue; K-max; Delta K-th; microstructure; corrosion fatigue; slip mode; load ratio; 7049; and; 7075; alloys;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The role of microstructure and environmental influence on fatigue crack has been investigated on a high strength 7049 aluminium alloy, artificially aged to underaged (UA) and overaged (OA) microstructures with approximately the same yield strength properties, but differing in the mode of slip deformation. The UA alloy deforms by planar slip while the OA alloy by wavy slip. Crack growth measurements were performed at constant load ratios, between 0.8 and -1, in ambient air and vacuum. The influence of load ratio is discussed in terms of slip deformation mechanisms, microstructure, and the influence of environment using die two intrinsic parameters, DeltaK and K-max. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：S311 / S317
页数：7
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