基于本征应变法修正厚板轮廓法应力测试误差  

Surface stress correction of the thick welded plate measured by contour method using eigenstrain method

作　　者：严益 刘川[1] 王春景[1] 沈嘉斌 YAN Yi;LIU Chuan;WANG Chunjing;SHEN Jiabing(Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学

出　　处：《焊接学报》2019年第11期82-86,I0004,I0005,共7页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51575251);江苏省研究生科研与实践创新计划项目(KYCX18_2319)

摘　　要：基于本征应变法,以轮廓法测试的部分内部应力数据为基础构造出切割面上的整体纵向应力分布,修正轮廓法测试切割面上的表面应力误差,并研究了本征应变阶数对构造结果的影响.结果表明,本征应变法构造出的切割面上纵向应力分布与轮廓法测试结果符合较好,表层应力相比于轮廓法测试值提高了约27%;构造出的表面应力与XRD法测试结果符合较好,一定程度上能修正轮廓法表层纵向应力测试误差;沿切割面x方向和y方向本征应变基函数阶数采用16次和10次,能构造出较好的纵向应力场.The longitudinal stress distribution on the cut plane is constructed by the eigenstrain method based on part of the internal stress data measured by contour method,and the surface stress error is corrected by the eigenstrain method;the effect of the order of basis function for constructing eigenstrain distribution on the constructed stress is also investigated. Results show that longitudinal stress distribution trend on the cut plane constructed by eigenstrain method agrees well with that by the contour method, the surface stress is increased by about 27% as compared with theresult of contour method. The surface stresse obtained by the eigenstrain method agrees well with that measured by the XRD method, therefore, the stress error on the surfaces can be corrected to some extent by the eigenstrain method;the longitudinal stress on the cut plane can be constructed with the eigenstrain basis function with the order of 16 in the x direction and 10 in the y direction along the cutting surface.

关 键 词：本征应变法 轮廓法 残余应力 误差 

分 类 号：TG404[金属学及工艺—焊接]