复合材料车体连接结构性能分析及测试

Performance Analysis and Test of Composite Car Body Connection Sructure

为实现轨道交通车辆轻量化设计目标,车体研究采用碳纤维复合材料替代金属材料。复合材料车体部件之间的连接位置往往是整体力学性能薄弱区域,铆接—胶接混合连接方式具有高强度、密封性、耐疲劳性能,是目前常用的连接方式。研究连接接头的力学性能及损伤模式有助于提高整体性能,选取复合材料车体典型连接结构,使用Abaqus软件进行有限元模拟分析,并通过样件制作、试验测试进行力学性能及失效模式研究。研究表明,该结构在拉伸、压缩工况下强度满足车辆需求,样件失效主要原因为工字梁复合材料零件层间开裂,其失效模式与模拟仿真结果基本相同。研究结果可为复合材料车体部件连接结构强度设计及优化设计提供支持。

In order to reduce the weight of railway vehicles,carbon fiber composite materials were used in car body to replace metal materials.The connection position between car body units is often the weak area of whole vehicle properties.Bond-riveted joint has the advantage of high strength、continuous sealing and anti-fatigue properties.Bond-riveted joint was the primary joining method used for the construction of the car body structure made of carbon fiber composite materials.Studying the mechanical properties and damage modes of the joint is helpful to improve the whole vehicle performance.The typical connection structure of car body parts is selected as the research object.Abaqus software was used for finite element simulation.The mechanical properties and failure modes were studied through the manufacturing and testing of joint samples.The research shows that the strength of the connection structure meets the requirements of the vehicle under tension and compression conditions.The main reason for the failure of the sample is the interlayer cracking of the I-beam composite parts,and the failure mode is basically the same as the simulation results.The research results provide support for the structural strength design and optimization design of composite car body components.