文献类型：期刊文献

中文题名：列车荷载-水耦合作用下无砟轨道水平裂纹尖端强度因子有限元计算模型

英文题名：Finite Element Computational Model of Crack Tip Intensity Factor for CRTSⅡ Ballastless Track under Train Load-water Coupling

作者：徐桂弘 张卫彪 刘振男 刘学毅

第一作者：徐桂弘

机构：[1]贵州理工学院土木工程学院;[2]中铁二十四局集团有限公司西南指挥部;[3]西南交通大学高速铁路线路工程教育部重点实验室

第一机构：贵州理工学院土木工程学院

年份：2018

卷号：40

期号：11

起止页码：134-139

中文期刊名：铁道学报

外文期刊名：Journal of the China Railway Society

收录：CSTPCD;;EI(收录号：20190806521227);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金(51508121;E080704);贵州省科学技术基金(黔科合LH字[2014]7374;黔科合J字[2015]2063;贵州省科技计划(黔科合LH字[2016]7096)

语种：中文

中文关键词：CRTSⅡ型板式无砟轨道;水平裂纹;应力强度因子

外文关键词：CRTSⅡ ballastless track;horizontal crack;stress intensity factor

摘要：针对CRTSⅡ型板式无砟轨道结构层间裂纹扩展的典型现象,建立列车荷载-水耦合作用下裂纹尖端强度因子的三维计算模型。依据水压力在裂纹表面作用的特点,基于弹性力学及断裂力学原理,引入双协调方程、Westergaard应力函数,得到应力分量及位移分量。把裂纹表面受到均布水压力引起裂纹尖端强度因子增大的问题,简化为裂纹表面受无数集中力时的叠加而引起裂纹尖端强度因子的增大问题。结果表明,CRTSⅡ型板式无砟轨道水平裂纹扩展类型为Ⅰ型,依据Ⅰ型裂纹失稳扩展发生在应变能密度因子S最小方向,确定CRTSⅡ型板式无砟轨道水平裂纹沿着原来的裂纹面扩展。通过ANSYS-Workbench-Fracture Tool平台下裂纹尖端强度因子计算,建立了有限元计算的模型,计算结果合理性通过复合试件拉伸试验得到了验证。
According to the typical interlaminar crack propagation of CRTS Ⅱ ballastless track structure, a three dimensional calculation model for the crack tip intensity factor under the train load water coupling was estab lished. According to the characteristics of the water pressure acting on the crack surface, based on the theory of elastic mechanics and fracture mechanics, by introducing the dual coordinate equation and the Westergaard stress function, the stress component and displacement component were obtained. The problem of increased in tensity factor of the crack surface caused by uniform water pressure, was reduced to the problem of increased intensity factor caused by numerous concentration superposition. The results show that the type of CRTS Ⅱ ballastless track horizontal crack is Type I crack. According to the occurrence of type I crack expansion in the minimum direction of strain energy density, the crack propagation along the original crack plane of CRTS Ⅱ Ballastless track is determined. According to the calculation of crack tip intensity factor under ANSYS Work bench Fracture Tool platform, the finite element calculation model is established. The rationality of the calcula tion results was verified by the tensile tests of the composite specimen.