东南大学学报（英文版）2018，Vol.34Issue(1)：62-70,9.DOI:10.3969/j.issn.1003-7985.2018.01.010
十字板焊接空心球节点数值模拟和常幅疲劳试验
Numerical simulation and experimental study on constant amplitude fatigue behavior of welded cross plate-hollow sphere joints
摘要
Abstract
In order to reveal the constant-fatigue fracture form and mechanism of the welded cross plate-hollow sphere joints (WCPHSJs) and establish its formula, the WCPHSJs were fatigue tested. A total of 19 specimens were tested under constant amplitude fatigue loads using a specially designed test rig. The joint was analyzed statically by the finite element analysis ( FEA), and metallographic analysis of fatigue fracture was done by the electron scanning microscope. Numerical simulation and experimental results show that the hot-spot of WCPHSJ lies at the weld toe location where severe stress is concentrated. Fatigue cracks initiate at the weld toe and then propagate circumferentially around the sphere with a diameter equivalent to the width of the cross plate up to the fatigue fracture. The initial welding defects and constructional detail constitute the main factor of fatigue failure. The S-N curves for the joints were developed through a linear regression analysis of fatigue data. A formula for calculating constant amplitude fatigue, based on the concept of the hot spot stress amplitude, is proposed.关键词
十字板焊接空心球节点/常幅疲劳加载/有限元分析/S-N曲线Key words
welded cross plate-hollow sphere joint/constant amplitude load/finite element analysis/S-N curve分类
建筑与水利引用本文复制引用
焦晋峰,雷宏刚,陈幼佳..十字板焊接空心球节点数值模拟和常幅疲劳试验[J].东南大学学报（英文版）,2018,34(1):62-70,9.基金项目
The National Natural Science Foundation of China(No.51578357),the Natural Science Foundation of Shanxi Province(No.2015011062),Talent Training Program in the Postgraduate Joint Training Base of Shanxi Province(No.2016JD11). （No.51578357）
