A link-up resulted fatigue crack branching in Al-Cu-Mg alloy

被引：8
|
作者：
Lu Songsong [1 ]
Bao Rui [1 ]
Zhang Ting [1 ]
Fei Binjun [1 ]
机构：
[1] Beihang Univ BUAA, Sch Aeronaut Sci & Engn, Inst Solid Mech, Beijing 100191, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2016年 / 92卷
基金：
中国国家自然科学基金;
关键词：
Fatigue crack growth; Crack branching; Al-Cu-Mg alloy; Spectrum loading; ALUMINUM-ALLOY; PROPAGATION; BEHAVIOR; GROWTH; 7050-T7451; 2324-T39; THRESHOLD; SPECTRA; PLATE; STEEL;
D O I：
10.1016/j.ijfatigue.2016.02.036
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Fatigue crack branching phenomena in Al-Cu-Mg alloy 2324-T39 are studied. Both spectrum and constant amplitude loading cases are examined. A novel type of crack branching process and mechanism is present, which results from the link-up of the secondary crack with the main crack. The grain shapes in 2324-T39 are different from those in the 2024 and 2524 alloys, and their interaction with the plastic zone size contributes to the appearance of this type of crack branching. FE analysis shows that the surface secondary crack is located near the plastic zone boundaries of the main crack. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：459 / 469
页数：11
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