湿热老化对碳纤维增强复合材料设备舱强度影响  

Influence of Hygrothermal Aging on the Strength of Carbon Fiber Reinforced Compo-site Material Equipment Cabin

作　　者：何子坤 肖守讷[1] 江兰馨 陈东东 王明猛[1] HE Zikun;XIAO Shoune;Jiang Lanxin;CHEN Dongdong;WANG Mingmeng(State Key laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,610031,Chengdu,China;School of Mechanical Engineering,Sichuan University,610065,Chengdu,China)

机构地区：[1]西南交通大学轨道交通运载系统全国重点实验室,成都610031 [2]四川大学机械工程学院,成都610065

出　　处：《城市轨道交通研究》2024年第12期278-283,共6页Urban Mass Transit

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(P2020J024);牵引动力国家重点实验室自主课题(2020TPL_T07)。

摘　　要：[目的]轨道交通列车的运行环境较为复杂,列车上的复合材料在运行期间会受到恶劣的外界因素影响而出现老化现象,因此有必要研究湿热老化对碳纤维复合材料设备舱强度的影响。[方法]对碳纤维复合材料进行湿热老化试验及静态力学(拉伸、压缩、剪切)试验,获得湿热老化前、后复合材料的力学性能参数;建立某型号碳纤维复合材料的设备舱有限元模型,采用试验的方法获得湿热老化前、后的材料参数,计算设备舱在气动载荷下的静强度。[结果及结论]湿热老化后的编织碳纤维复合材料力学性能有不同程度的衰减,压缩强度下降最大,下降了39.3%;与初始状态相比,各碳纤维部件的Tsai-Wu失效因子均出现了不同程度的增大,湿热老化导致的碳纤维强度和碳纤维模量的退化会引起设备舱刚度和承载极限的退化。[Objective]The operating environment of rail transit trains is relatively complex,and composite materials on the trains are subject to deterioration during operation due to the aging phenomenon caused by harsh external factors.Therefore,it is necessary to study the effect of hygrothermal aging on the strength of carbon fiber composite equipment cabins.[Method]Hygrothermal aging tests and static mechanics(tensile,compression,shear)tests on carbon fiber composite are conducted to obtain their mechanical performance parameters before and after hygrothermal aging.An equipment cabin finite element model for a certain type of carbon fiber composite is established.The material parameters before and after hygrothermal aging are obtained by experimental methods,and the static strength of the equipment cabin under aerodynamic loads is calculated.[Result&Conclusion]The mechanical properties of woven carbon fiber composites after hygrothermal aging show different degrees of attenuation,with the compressive strength decreasing the most by 39.3%;compared with the initial state,the Tsai-Wu failure factors of each carbon fiber component show different degrees of increase.The degradation of carbon fiber strength and carbon fiber modulus due to the hygrothermal aging may cause the degradation of equipment cabin stiffness and bearing limit.

关 键 词：列车 碳纤维复合材料 设备舱强度 湿热老化 

分 类 号：U270.4[机械工程—车辆工程]