基于微小试样的薄壁异种金属高能束焊接接头界面区局部力学性能表征  

Prediction of Local Mechanical Properties in the Interface Region of Thin-walled Dissimilar High Energy Beam Welded Joint Based on Micro-specimen

作　　者：范凯 钟继如 FAN Kai;ZHONG Jiru(Shanghai Institute of Space Propulsion,Shanghai 201112,China;Shanghai Engineering Center of Space Engine,Shanghai 201112,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]上海空间推进研究所,上海201112 [2]上海空间发动机工程技术研究中心,上海201112 [3]华东理工大学机械与动力工程学院,上海200237

出　　处：《载人航天》2025年第2期212-219,共8页Manned Spaceflight

基　　金：上海市“科技创新计划”启明星培育(扬帆专项)项目(22YF1429400)。

摘　　要：获取准确的界面区局部力学性能,以实现航天器各组件中薄壁异种金属焊接接头完整性分析。首先通过小冲杆试验测得界面区不同位置材料试样的力-挠度曲线,再采用有限元模拟反演得到典型区域(母材、熔合区、热影响区)的真应力-真塑性应变曲线和GTN损伤参数,最后通过数值计算和比例试样拉伸试验模拟确定典型区域材料的屈服强度和抗拉强度,并与试板性能测定数据进行对比。结果表明:薄壁1050A/5A06焊接接头中1050A母材区、熔合区、热影响区、5A06母材区的真应力-塑性应变曲线、屈服强度和抗拉强度均依次升高,同时得到的材料强度与实际拉伸试验得到的强度值相当,说明基于微小试样的薄壁异种金属高能束焊接接头界面区局部力学性能预测可行有效。To obtain accurate local mechanical properties of the interface region and realize the integrity analysis of the thin-walled dissimilar high energy beam welded joint in spacecraft components,the force-deflection curves of material specimens with different locations in the interface region were measured by small punch test,and then the true-stress-plastic strain curves and GTN damage parameters of typical regions(base metal,fusion zone,heat affected zone)were obtained by finite element simulation inversion.Finally,the yield strength and tensile strength of the materials in the typical region were determined by numerical calculation and proportional specimen tensile test simulation.The results showed that the true stress-plastic strain curve,yield strength and tensile strength of 1050A base metal zone,fusion zone,heat affected zone and 5A06 base metal zone in the thin-walled dissimilar high energy beam welded joint increased successively,and the material strength values were equivalent to the strength values obtained by tensile test It is feasible and effective to predict the local mechanical properties of the interface region of the thin-walled dissimilar high energy beam welded joint based on the micro-specimen.

关 键 词：薄壁异种金属焊接接头 局部力学性能 小冲杆试验 有限元反演 结构完整性 

分 类 号：TH142[一般工业技术—材料科学与工程] O346.1[机械工程—机械制造及自动化]