基于薄片材料的无损检测方法概述

A non-destructive testing summarization based on thin sheet material

从概述的角度介绍了针对薄片材料无损检测的一种新方法。针对薄片材料在外部力学或者温度影响导致材料属性的变化,采用了远端激励和无接触测量的方式检测材料振动参数,从而达到测量材料属性的目的。该方法采用一种间接测量的途径,用以探究材料属性的变化,其可以方便的使用到多种复杂条件的环境中。薄片材料在受到外部拉伸力作用时,其力学及模态参数会随着时间的推移而改变.当在拉伸机环境下模拟该力学条件时,相应的使用声学途径激励薄片材料,同时使用激光振动仪测量薄片的物理参数,分析其模态变化,从而达到检测薄片材料属性变化的目的。实际试验结果表明该方法对于柔性或者不适合使用接触式传感器的检测限制下,能达到理想的无损检测效果。

This article introduced a new non-destructive method applied on thin membrane material in general. In order to obtain the shifting of the material properties that caused by the outer mechanics or temperature, the work adopted a remote excitation and a non-contact measurement method to get the vibration parameters. The method used an undirected measuring approach to study the changing of the material properties. It can be convenient used to many complicated environments. Applying an extensional force on the thin membrane, the mechanical and modal parameters are shifting as time goes by. When the mechanical conditions are simulated under a tensile machine, simultaneously excite the membrane with acoustic approach and measure the physical parameters with a laser vibrometer, the modal parameters are processed thereafter. Then it measures the shifting characteristics of the thin membrane. The practical experimental results show that this method is an ideal testing approach if the material is soft or it can＇t apply a contact sensor approach.