基于DIC方法R60702/TA2爆炸焊接复合板力学性能研究  

Mechanical Properties Investigations of Explosively Welded R60702/TA2 Composite Plate Using Digital Image Correlation

作　　者：李志 李庆生[1] 李诗韵 Li Zhi;Li Qingsheng;Li Shiyun(School of Machemical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《稀有金属》2020年第8期826-833,共8页Chinese Journal of Rare Metals

基　　金：江苏省六大人才高峰项目(2014-ZBZZ-013)资助。

摘　　要：锆-钛爆炸焊接复合板的应用用越来越广泛,力学性能是关注的重点。爆炸焊接过程对复合板力学性能的影响至关重要。对锆-钛爆炸焊接复合板进行分层拉伸试验,结合扫描电子显微镜(SEM)对拉伸试验后断口形貌进行观察,研究了爆炸焊接后锆-钛复合板沿着厚度方向拉伸力学性能的变化;通过引伸计法和数字图像相关(DIC)方法得到拉伸试验的应变;使用数字图像相关方法对弯曲试验全场应变进行测量,并与有限元模拟得到的弯曲应变场进行比较。结果表明:锆-钛结合界面层抗拉强度最大,断后延伸率最小;随着与结合界面距离的增加,钛侧的抗拉强度逐渐减小,断后延伸率缓慢增加;数字图像相关方法和引伸计法得到的弹性模量相对误差为1.06%;不同分层之间的断口形貌存在差异,离结合界面越远,材料的塑韧性越好;数字图像相关方法和有限元方法得到的弯曲应变场吻合较好,相对误差不超过5%。Explosively welded Zr-Ti composite plate is used more and more widely and mechanical property is the focus of attention.The effect of explosive welding process on the mechanical properties of clad plate is important and has not been reported.The layering tensile test was carried out and the tensile fracture morphology was observed utilizing scanning electron microscope(SEM)to investigate the mechanical properties along the thickness direction of explosively welded Zr-Ti composite plate.The strain of tensile test was obtained from extensometer and digital image correlation(DIC)method.The strain field of bending test measured by DIC method was compared with the simulation results of finite element method.The results demonstrated that the layer with bonding interface had the largest tensile strength and the smallest elongation.With the increase of the distance from the bonding interface,the tensile strength of the titanium side decreased gradually while the elongation increases slowly.The relative error of elastic modulus obtained from DIC and extensometer was 1.06%.The fracture morphology of different layers was various.The farther away from the bonding interface,the better the plasticity of material.The strain fields obtained by DIC method and finite element method were in good agreement,and the relative error was less than 5%.

关 键 词：锆-钛复合板 数字图像相关方法 拉伸试验 弯曲试验 有限元模拟 

分 类 号：TG91[金属学及工艺—钳工工艺]