Ratcheting Behavior of Weld Joints Under Uniaxial Cyclic Loading Using Miniature Specimen

作     者：Jiankai Tang Zhe Zhang Hongsheng Lu Xu Chen 

作者机构：School of Chemical Engineering and TechnologyTianjin University 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2019年第25卷第3期

页      面：283-292页

核心收录：

学科分类：12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (No. 51435012) 

主　　题：Ratcheting Weld joints Heat-affected zone Miniature specimen Heterogeneity 

摘      要：Because of the size limitation of weld joints in different regions, the traditional standard bar specimen is not suitable to investigate the mechanical properties of weld joints. In this study, miniature specimens were extracted from specific regions(base metal, weld metal, and three heat-affected zones) of API X80 and X70 weld joints. Uniaxial tensile tests were conducted to obtain the mechanical properties of different regions, and then uniaxial ratcheting tests were conducted to investigate the ratcheting behaviors of the different regions under the same peak and nominal stresses. Under both the tensile tests and ratcheting tests, the weld joints exhibit heterogeneous results, such as different mechanical properties and ratcheting behaviors, which were region dependent. Furthermore, the yield strength and yield-to-tensile strength ratio contribute differently to the ratcheting response.