碳纤维环氧织物复合材料受力位置识别方法  

Force position identification method of carbon fiber epoxy fabric composite

作　　者：杨浩 杨玉娥[1] 刘文涛 刘城 Yang Hao;Yang Yu'e;Liu Wentao;Liu Cheng(School of Mechanical Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学机械工程学院,济南250022

出　　处：《电子测量技术》2022年第22期69-74,共6页Electronic Measurement Technology

摘　　要：由于高速列车在运行过程中,车下设备舱底板由于受到不同程度异物撞击,使得复合材料性能下降影响列车运行安全,所以寻求一种可靠、准确的方法检测损伤位置显得尤为重要。由于复合材料受力变化会引起相关结构参数及模态特性变化,现拟用一种模态分析方法预测复合材料的受力位置,对模态参数(固有频率及相对振幅比)与受力位置之间的关系进行研究。通过模态分析软件m+p SO Analyzer建立复合材料对应的平面模型,对复合材料的振动特性进行测试分析,建立不同位置受力时,复合材料的固有频率及相对振幅比等高线图;进一步,通过固有频率确定受力位置到复合材料中心的距离;最后,结合相对振幅比确定复合材料的受力位置。结果表明,基于固有频率及振幅变化可以成功预测碳纤维环氧树脂复合材料试件的受力位置,并可以将误差控制在5%的范围内。During the operation of high-speed trains,due to the impact of different degrees of foreign bodies on the bottom plate of the equipment cabin under the train,the decline in the performance of composite materials affects the safety of train operation.Therefore,it is particularly important to find a reliable and accurate method to detect the damage location.Due to the change of structural parameters and modal characteristics of composite materials,a modal analysis method is proposed to predict the stress position of composite materials,and the relationship between modal parameters(natural frequency and relative amplitude ratio)and stress position is studied.The plane model of the composite was established by the modal analysis software m+p SO Analyzer,and the vibration characteristics of the composite were tested and analyzed.The contour maps of the natural frequency and relative amplitude ratio of the composite under different positions were established.Furthermore,the distance from the stress position to the center of the composite material is determined by the natural frequency;finally,the stress position of the composite was determined by combining the relative amplitude ratio.The results show that the force position of carbon fiber epoxy resin composite specimen can be successfully predicted based on the change of natural frequency and amplitude,and the error can be controlled within 5%.

关 键 词：复合材料 结构损伤 固有频率 相对振幅比 

分 类 号：TG115.28[金属学及工艺—物理冶金]