Fatigue life prediction based on natural frequency changes for spot welds under random loading

被引：23
|
作者：
Wang, Rui-Jie [1 ]
Shang, De-Guang [1 ]
机构：
[1] Beijing Univ Technol, Coll Mech Engn & Appl Elect Technol, Beijing 100022, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2009年 / 31卷 / 02期
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Fatigue life; Natural frequency; Spot welds; Random loading; Fatigue damage; DAMAGE MODEL; JOINTS; IDENTIFICATION; SPECIMENS; BEHAVIOR;
D O I：
10.1016/j.ijfatigue.2008.08.001
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Fatigue tests were carried out on tensile-shear spot-welded specimens under random loading; at the same time, natural frequencies at different life stages were measured. Test results were compared with that under constant amplitude loading. The relationship between damage and natural frequency change ratio established under constant amplitude loading is here modified. The nonlinear damage evolution equation was established using the damage represented by frequency change for spot welds. The fatigue life of spot welds under random loading was predicted with this damage evolution relationship using the rainflow counting method results, as well as other life prediction methods with different counting methods. Comparison of life prediction results showed that the method using changes of natural frequency can be an on-line approach and the predicted lives have a good agreement with the experimental data. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：361 / 366
页数：6
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