基于DIC方法的铝合金焊接接头拉伸性能研究  

STUDY ON TENSILE PROPERTIES OF ALUMINUM ALLOY WELDING JOINT USING DIC METHOD

作　　者：曹广龙 陈亮[2] 任明法[1] 陈继乐 张亚辉[1] CAO GuangLong;CHEN Liang;REN MingFa;CHEN JiLe;ZHANG YaHui(State Key Laboratory of Structural Analysis far industrial Equipment,Dalian University of Technology,Dalian 116024,China;Shenyang Aircraft Design Institute,Shenyang 110035,China;Dept,of Engineering Mechanics,Dalian Maritime University,Dalian 116024,China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连116024 [2]沈阳飞机设计研究所,沈阳110035 [3]大连海事大学工程力学系,大连116024

出　　处：《机械强度》2019年第3期588-593,共6页Journal of Mechanical Strength

基　　金：国家重点基础研究发展计划(2014CB046506;2014CB049000);国家自然科学基金项目(11372058)资助~~

摘　　要：为准确表征铝合金焊接接头拉伸性能,针对2219铝合金搅拌摩擦焊焊接接头,采用数字图像相关(DIC)方法,测量焊接接头在拉伸载荷作用下的全场应变历程,得到铝合金焊接接头焊接区在拉伸时的连续屈服强度曲线。进而结合材料弹塑性本构模型,拟合焊接区内各点处材料本构关系,并分别构造了铝合金焊接接头焊缝区及热影响区力学性能连续变化的拟合函数,使之可以表达铝合金焊接接头焊接区内任意一点力学性能。最后利用所构造的力学性能函数模拟了铝合金焊接接头的拉伸过程,数值结果与试验相吻合,表明基于数字图像相关法的应变测量可以准确地表征其焊接区内的材料力学性能。In order to obtain the properties of 2219 aluminum alloy welding joint,this work uses digital image correlation(DIC) method,then the whole strain history within the welding zone of 2219 aluminum alloy friction stir welded joint subjected to tensile load is obtained,which in turn facilitates a continuous yield strength curve for the welding zone.The elastic-plastic constitutive equation is employed to describe mechanical properties of the welding zone with its parameters determined by the measured strain history.Then,the relationship between the distances from any location to the weld zone center and parameters in the equation can be established by fitting.Finally,a numerical simulation of welding joint subjected to tensile load is conducted using the mechanical properties given by the obtained relationship.The simulation results agree well with the experimental data.Therefore,it is proposed that the mechanical properties of the welding zone in a welding joint can be accurately obtained by analyzing its stress-strain curves measured by DIC method.

关 键 词：2219铝合金 焊接接头 数字图像相关法 拉伸性能 

分 类 号：TG407[金属学及工艺—焊接]