Effects of ultrasonic impact treatment on pre-fatigue loaded high-strength steel welded joints

被引：33
|
作者：
Zhang, Hai
Wang, Dongpo [1 ]
Xia, Liqian
Lei, Zhenyu
Li, Yizhe
机构：
[1] Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2015年 / 80卷
基金：
中国国家自然科学基金;
关键词：
Ultrasonic impact treatment; Pre-fatigue; Fatigue life; Cracks; Finite element analysis; IMPROVEMENT; RESISTANCE;
D O I：
10.1016/j.ijfatigue.2015.06.017
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Comparative fatigue tests were conducted on as-welded, weld toe peened specimens before and after fatigue loading. Fracture surface, residual stress, microstructure and hardness were determined. The test results showed that as the pre-fatigue loading period extended, deeper cracks may have initiated and propagated and the fatigue life improvement decreased. The processes of ultrasonic peening on welded joints with existing cracks were modeled by finite element analysis. The numerical results indicated that the mechanism of UIT improving fatigue performance included two factors: compressive residual stress and the change of crack orientation. Both effects reduced as the crack became deeper. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：278 / 287
页数：10
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