Fatigue crack growth behaviour and life prediction for 2324-T39 and 7050-T7451 aluminium alloys under truncated load spectra

被引：41
作者：
Bao, Rui [1 ]
Zhang, Xiang [2 ]
机构：
[1] Beihang Univ BUAA, Inst Solid Mech, Sch Aeronaut Sci & Engn, Beijing 100191, Peoples R China
[2] Cranfield Univ, Sch Engn, Dept Aerosp Engn, Cranfield MK43 0AL, Beds, England
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2010年 / 32卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Fatigue crack growth; Fatigue load spectra; Crack branching; Retardation; Life prediction; RATES;
D O I：
10.1016/j.ijfatigue.2009.12.010
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This paper presents a study of crack growth behaviour in aluminium alloys 2324-T39 and 7050-T7451 subjected to flight-by-flight load spectra at different low-stress truncation levels. Crack branching was observed in the higher truncation levels for the 2324 and in all truncation levels for the 7050. Mode I crack growth life can be predicted for the 2324 alloy by the NASGRO equation and the Generalised Willenborg retardation model. However, quantitative prediction of the fatigue life of a significantly branched crack is still a problem. Material properties, test sample's orientation and applied stress intensity factor range all play dominant roles in the fracture process. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1180 / 1189
页数：10
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