基于IRSM的7075铝合金焊接接头抗拉强度可靠性优化设计  

IRSM-based tensile strength reliability optimization design of 7075 aluminum alloy welded joints

作　　者：陈晓[1] 闫成旗 代俊辉 Chen Xiao;Yan Chengqi;Dai Junhui(Anyang Institute of Technology,Anyang 455000,Henan,China)

机构地区：[1]安阳工学院,河南安阳455000

出　　处：《焊接》2024年第10期32-41,共10页Welding & Joining

基　　金：河南省自然科学基金资助项目(232300420325);安阳工学院科研培育基金资助项目(YPY2019009)。

摘　　要：【目的】为提升7075铝合金焊接接头抗拉强度可靠性,提出一种基于IRSM的7075铝合金焊接接头抗拉强度可靠性优化设计方法。【方法】首先,基于有限元理论及焊接试验平台,分别分析主轴力对焊接温度及接头抗拉强度的影响;其次,依据仿真及试验数据,初步构建焊接接头温度及抗拉强度响应面模型,进而构建焊接接头响应面优化模型,利用优化算法重构焊接接头改进响应面模型(Improved response surface model,IRSM),在此基础上,依据接头最优试验样本数据及可靠性优化原理,构建焊接接头可靠性优化模型,利用多目标优化算法及三向主轴力最小化原则完成Pareto最优解筛选;最后,以7075铝合金焊接板材为研究对象,对其开展抗拉强度可靠性优化研究。【结果】研究结果表明,当焊接参数为1500 r/min,140 mm/min时,接头抗拉强度达到最佳的406.5 MPa;经优化后,接头抗拉强度可靠度达到97.5%,同时最大焊接温度下降至302.5℃。【结论】该结论可为7075铝合金焊接接头质量提升提供参考价值。[Objective]To improve the reliability of tensile strength of 7075 aluminum alloy welded joints,an IRSM based optimization design method for the reliability of tensile strength of 7075 aluminum alloy welded joints is proposed.[Methods]Firstly,based on finite element theory and welding test platform,the effects of spindle force on welding temperature and joint tensile strength are analyzed separately.Secondly,based on simulation and experimental data,a response surface model for temperature and tensile strength of welded joints is preliminarily constructed,followed by an optimization model for the response surface of welded joints.The optimization algorithm is used to reconstruct the improved response surface model of welded joints.On this basis,based on the optimal test sample data and reliability optimization principles of joints,a reliability optimization model for welded joints is constructed.Multi-objective optimization algorithm and the principle of minimizing the principal axis force in three directions is used to complete the Pareto optimal solution screening.Finally,a study is conducted on the reliability optimization of tensile strength of 7075 aluminum alloy welded plates.[Results]The research results indicate that when the welding parameters are 1500 r/min and 140 mm/min,the optimal tensile strength of the joint is 406.5 MPa.After optimization,the reliability of the joint tensile strength reaches 97.5%,while the maximum welding temperature decreases to 302.5℃.[Conclusion]This conclusion can provide reference value for improving the quality of 7075 aluminum alloy welded joints.

关 键 词：7075铝合金 抗拉强度 可靠性 优化设计 响应面 

分 类 号：TG407[金属学及工艺—焊接]