DIC-based studies of the overloading effects on the fatigue crack propagation behavior of Ti-6Al-4V ELI alloy

被引：44
作者：
Chen, Chuanyong [1 ]
Ye, Duyi [1 ]
Zhang, Lina [2 ]
Liu, Jianzhong [2 ]
机构：
[1] Zhejiang Univ, Inst Proc Equipments, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China
[2] Beijing Inst Aeronaut Mat, Div Mech Properties, Beijing 100095, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2018年 / 112卷
基金：
中国国家自然科学基金;
关键词：
Fatigue crack propagation; Overloading effect; Crack-tip; Digital image correlation (DIC); Ti-6Al-4V ELI alloy; DIGITAL IMAGE CORRELATION; CONSTANT AMPLITUDE; RESIDUAL-STRESS; GROWTH; CLOSURE; UNDERLOADS; PREDICTION; DEFORMATION; SURFACE; LOADS;
D O I：
10.1016/j.ijfatigue.2018.03.017
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this paper experimental correlations between da/dN and Delta K and between a vs. N of an extra-low-interstitial titanium (Ti-6Al-4V ELI) alloy under four typical overload conditions (OL, UL, OL-UL and UL-OL) in an otherwise constant amplitude loading were obtained. By means of the digital image correlation (DIC) technique, the crack-tip deformation fields as well as the crack opening process corresponding to the four overloading patterns were measured. The results shown that both the crack propagation behaviors and the crack-tip strain distributions of the Ti-alloy were greatly influenced by the overloading conditions applied. The effect of the overloading pattern (sequence) on the fatigue crack propagation behavior of the Ti-alloy was then analyzed by combining the crack-tip deformation measurements with the fatigue crack propagation results from three possible mechanisms, i.e., the crack-tip blunting effect, the crack closure effect and crack-tip plastic zone effect. It was found that for the present investigated Ti-6Al-4V ELI alloy, the above three mechanisms made contributions in different extents to the fatigue crack growth retardation behavior.
引用
收藏
页码：153 / 164
页数：12
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