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基于形状改变比能和材料属性离散的焊接残余应力估算
引用本文:林鸿志,薛彩军,张俊苗. 基于形状改变比能和材料属性离散的焊接残余应力估算[J]. 航空工程进展, 2013, 4(1): 60-65
作者姓名:林鸿志  薛彩军  张俊苗
作者单位:南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京,210016
基金项目:中央高校基本科研业务费专项资金资助南京航空航天大学开放基金(kfjj20110201);江苏省自然科学基金(BK2012795)
摘    要:为了提高焊接残余应力测量精度,在2219-T87铝合金TIG焊接接头残余应力测定试验基础上,通过离散接头材料属性并利用形状改变比能对焊接残余应力进行塑性修正,分别研究孔边塑性变形和接头强度不匹配对焊接残余应力估算的影响。结果表明:同时考虑孔边塑性变形和接头强度不匹配因素的焊接残余应力估算方法,比线弹性残余应力计算方法能最大减小39.8%的误差;当测量点距焊缝距离小于8mm时,在考虑孔边塑性变形的情况下,同时考虑接头不匹配的影响相比不考虑其影响可最大减小40.6%的误差;当测量点距焊缝距离大于8mm时,可忽略接头强度不匹配对焊接残余应力估算的影响。

关 键 词:焊接残余应力  孔边塑性变形  接头强度不匹配  形状改变比能  材料属性离散
收稿时间:2012-05-07
修稿时间:2012-05-29

Welding Residual Stress Estimation based on the Shape-changed Strength Ratio and Material Property Discretization
LIN Hong-zhi,XUE Cai-jun and ZHANG Jun-miao. Welding Residual Stress Estimation based on the Shape-changed Strength Ratio and Material Property Discretization[J]. Advances in Aeronautical Science and Engineering, 2013, 4(1): 60-65
Authors:LIN Hong-zhi  XUE Cai-jun  ZHANG Jun-miao
Affiliation:(Key Laboratory of Fundamental Science for National Defense-advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
Abstract:In order to improve the measurement accuracy of welding residual stress, welding residual stress is corrected by using shape-changed strength ratio and the method of discretizing joint material property on the base of residual stress test of 2219-T87 aluminum alloy TIG welding joint. Simultaneously, the effects of plastic deformation around holes and joint strength mismatch on welding residual stress estimation are studied separately. The results show that the method of estimating welding residual stress which considers both plastic deformation around hole and joint strength mismatch can reduce 39.8% error through contrasting with linear elastic estimation method; The way of considering the effect of joint strength mismatch and plastic deformation can reduce 40.6% error when the distance between the measuring point and welding seam is less than 8mm; And the joint strength mismatch effect on welding residual stress estimation can be ignored when the distance between the measuring point and welding seam is more than 8mm.
Keywords:Welding residual stress   plastic deformation around hole   joint strength mismatched   shape-changed strength ratio   material property discretization
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