Analysis of aluminum sheets with multiple sites damage based on fatigue tests and DIC technique

被引：24

作者：

Chen, Yajun ^{[1
]}

Sun, Shengjie ^{[1
]}

Ji, Chunming ^{[1
]}

机构：

[1] Civil Aviat Univ China, Sinoeuropean Inst Aviat Engn, Tianjin 300300, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2018年 / 109卷

基金：

中国国家自然科学基金;

关键词：

Multiple sites damage; Digital image correlation; Non-collinear crack; Fatigue; DIGITAL IMAGE CORRELATION; THERMOMECHANICAL RESPONSE; CRACK DEFLECTION; STAGE-II; LIFE; MECHANISMS; GROWTH; METHODOLOGY;

D O I：

10.1016/j.ijfatigue.2017.12.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In order to study the multiple sites damage (MSD) under fatigue loading which was occurring in the airframe of aging aircraft, the digital image correlation (DIC) technique was used to evaluate MSD in the hollow pre-notched specimen with 2024-T4 aluminum alloy subjected to cyclic loading conditions. Fatigue lives and displacement fields obtained from digital images recorded during fatigue tests were used to analyze the crack initiation and propagation. The results show that the fatigue life increases with the increase of hole spacing and that the case of collinear cracks becomes more dangerous than that of non-collinear cracks for MSD specimens. The experiments and DIC analyses were carried out to validate the type of fatigue crack propagation, firstly by mode I, and then by the mode I and II with hybrid expansion. Based on the combination of ABAQUS and Paris formula, stress intensity factors (SIF) and fatigue lives were acquired, which provide the conservative estimation of fatigue life.

引用

页码：37 / 48

页数：12

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