【摘要】 采用试验和有限元的方法研究了焊接空心球连接节点中钢管焊趾处的应力集中特性。研究表明:焊接空心球连接节点的钢管焊趾处的垂直焊缝应力、环向应力和径向应力均为拉应力,其中垂直应力最大,环向应力约为垂直应力的1/2,径向应力最小。钢管焊趾处的热点应力随空心球外径和钢管壁厚的增大而增大,随空心球壁厚、钢管外径和焊脚尺寸的增大而减小。建立焊接空心球节点钢管焊趾处的热点应力集中系数求解公式,为建立以热点应力幅为参量的焊接空心球节点钢管焊趾处的疲劳设计方法奠定基础。更多还原

【Abstract】 In this study,the stress concentration characteristics of the weld toe of tube in joints were studied by conducting experiments and finite element analysis.The results show that the vertical stress,radial stress and hoop stress on the weld toe of tube were all tensile stress.The vertical stress was the highest one,the hoop one was about half of the vertical one,the radial one is the lowest.The hot spot stress of the weld toe of tube increased with increase of outer diameter of hollow sphere and thickness of tube.It decreased with increasing thickness of hollow sphere,outer diameter of tube,and size of fillet weld.A formula was developed for calculating the hot spot stress concentration factor of the weld toe of tube,which is helpful for the fatigue design method of the weld toe of tube in the welded hollow spherical joint using the hot spot stress amplitude as a parameter.更多还原