钻孔DMI应变计法测定非均布点焊径向残余应力

›› 2016, Vol. 29 ›› Issue (9): 18-.

钻孔DMI应变计法测定非均布点焊径向残余应力

陈忠安1，高宗山1，赵玉津2,3，金学松4

(1.江苏大学土木工程与力学学院，江苏镇江 212013；2.美国南卡罗莱娜大学机械工程系，南卡罗莱纳州 803843864 ；
3.天津大学材料学院，天津 300072；4.西南交通大学牵引动力国家重点实验室，四川成都 610031)

出版日期:2016-09-15 发布日期:2016-09-26
作者简介:陈忠安（1955-），男，教授。研究方向：断裂力学，工程结构的疲劳与可靠性。
基金资助:
国家自然科学基金资助项目(51275338)；西南交通大学牵引动力国家重点实验室开放课题基金资助项目(TPL1301)

Measurement of Radial Residual Stresses in Spot Welds by the Hole-drilling DMI Strain Gage Method

CHEN Zhongan1, GAO Zongshan1, ZHAO Yujin2,3, JIN Xuesong433

(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China; 
2. Department of Mechanical Engineering, University of South Carolina, 80343864, USA; 
3.College of Material Science, Tianjin University, Tianjin 300072, China; 
4. Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China)

Online:2016-09-15 Published:2016-09-26

摘要/Abstract

摘要：

基于传统电阻应变计钻孔法无法测定点焊残余应力，提出以对中逐层钻孔的钻孔DMI应变计法来测定沿板厚方向非均匀的点焊径向残余应力。推导出了逐层钻孔所释放的径向残余应力与释放应变的关系方程；并在二维轴对称有限元模型上，采用分层加载的方法实现各层释放系数的仿真计算，标定了一个用于5层非均匀应力计算所需的释放系数表；利用该系数表，结合5步逐层钻孔测定点焊残余应力的示例，验证了该方法的有效性。

关键词: 点焊径向残余应力, 钻孔, DMI应变计, 释放系数

Abstract:

Residual stress of spot welding cannot be measured by the hole drilling method based on traditional resistance strain gauge. A DMI gauge method through centered layer-by-layer drilling is put forward to measure the radial inhomogeneous residual stress of spot welding along with the direction of the thickness of plate. The relationship between radial residual stress and strain that released from the incremental drilling hole is deduced, after which the hierarchical load method is adopted to conduct the simulating calculation of the release coefficients of each layer on two-dimension finite element model and a release coefficient chart required by 5 layer unequal stresses calculation is demarcated. The effectiveness of the method is verified by using the release coefficients as well as the example of 5-step layer-by-layer drilling method of measuring the residual stress of spot welding.

Key words: radial residual stress in spot welds, hole drilling, DMI strain gage, release coefficient

中图分类号:

TB121

陈忠安1，高宗山1，赵玉津2,3，金学松4. 钻孔DMI应变计法测定非均布点焊径向残余应力[J]. , 2016, 29(9): 18-.

CHEN Zhongan1, GAO Zongshan1, ZHAO Yujin2,3, JIN Xuesong433. Measurement of Radial Residual Stresses in Spot Welds by the Hole-drilling DMI Strain Gage Method[J]. , 2016, 29(9): 18-.