摘要
为了提高研究大型装配体结构局部区域三维裂纹扩展的计算效率及精度,提出一种基于分离体子模型的三维裂纹扩展研究方法。以重载货车车钩装配体为例,构建3种边界条件下的钩舌分离体,基于应变测点的均布载荷模型、接触非线性的接触力模型和基于受力分析的钩舌分离体模型,对3种边界条件分离体模型进行三维裂纹扩展仿真,对比分析仿真与疲劳台架试验结果。研究结果表明:以服役里程为指标,基于接触非线性的接触力模型结果偏于保守;以临界裂纹尺寸为指标,基于受力分析的钩舌分离体模型结果偏于危险;综合考虑服役里程与临界裂纹尺寸,基于应变测点的均布载荷模型与疲劳台架试验结果吻合最好。因此可基于此边界条件分离体进行不同载荷工况下的钩舌三维疲劳裂纹寿命评估。
In order to improve the computational efficiency and accuracy in the study of 3D crack propagation in certain areas of large assembly structures,a separated body submodel-based method for the study of 3D crack propagation was proposed.In the case of an assembly of heavy-haul wagon coupler,a coupler knuckle separated body was constructed based on three boundary conditions:the uniform load model based on strain test points,the contact force model based on contact nonlinearity and the coupler knuckle separated body model based on force analysis.The 3D crack propagation simulations were carried out on the three boundary condition separate body models to compare and analyze the simulation results and fatigue bench test results.The results show that the simulation results of the contact force model based on contact nonlinearity tend to be conservative with service mileage as the index.The simulation results of the coupler knuckle separated body model based on force analysis tend to be dangerous with critical crack size as the index.Considering the service mileage and critical crack size comprehensively,the uniform load model based on strain test points is in good agreement with the fatigue bench test results.The 3D fatigue life evaluation of the coupler knuckle under different load conditions can be carried out based on this boundary condition.
作者
王超
朱涛
肖守讷
阳光武
杨冰
丛盛国
WANG Chao;ZHU Tao;XIAO Shoune;YANG Guangwu;YANG Bing;CONG Shengguo(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;Dalian Technology R&D Center,CRRC Qiqihar Rolling Stock Co.,Ltd.,Dalian 116052,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2022年第8期42-49,共8页
Journal of the China Railway Society
基金
四川省杰出青年基金(2022JDJQ0025)
四川省国际科技创新合作项目(2022YFH0075)。
关键词
重载货车钩舌
分离体
子模型
三维裂纹扩展
heavy-haul wagon coupler knuckle
separated body
submodel
3D crack propagation
