Effect of split sleeve cold expansion on cracking behaviors of titanium alloy TC4 holes

被引：56
|
作者：
Yan, W. Z. [1 ]
Wang, X. S. [1 ]
Gao, H. S. [1 ]
Yue, Z. F. [1 ]
机构：
[1] Northwestern Polytech Univ, Adv Mat Test Ctr, Sch Mech Civil Engn & Architecture, Xian 710129, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2012年 / 88卷
基金：
国家高技术研究发展计划(863计划);
关键词：
Cold expansion; Fatigue performance; Crack propagation; Finite element; FATIGUE LIFE; SIMULATION; WORKING;
D O I：
10.1016/j.engfracmech.2012.04.008
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The effect of split sleeve cold expansion on fatigue behavior of titanium alloy TC4 open hole was investigated by experiment. After cold expansion, fatigue life of titanium alloy TC4 open hole was increased to 1.5-3.0 times. The residual compressive stress drastically retards the crack propagation rate, especially in the short crack stage. Corner crack initiated at the entrance face for cold expanded holes, while face crack initiated at the mid-plane of non-expanded holes. Finite element results showed that the lowest compression stress occurred at the entrance surface, while the largest one occurred near the middle of the hole wall. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：79 / 89
页数：11
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