A SIGNAL PROCESSING METHOD OF DETECTING AND LOCATING MATERIAL DEGRADATION OR MICRO-CRACKS USING ULTRASONIC GUIDED WAVES
会议名称：《第三届全国压电和声波理论及器件技术研讨会》
会议日期：2008年
学科分类：0810[工学-信息与通信工程] 08[工学] 081001[工学-通信与信息系统]
关 键 词：Guided waves micro-crack material degradation elastic modulus reduction quasi matrix pencil method
摘 要：The detection of micro-cracks or degradation of strength of materials at the early stage of fracture is of increasing importance in power plants and aviation industry.A methodology of detecting micro-cracks or degradation of material using quasi matrix pencil method is presented in this *** damage,is represented by small local elastic modulus *** of axisymmetric longitudinal guided waves to the presence of modulus reduction is studied using the Finite Element Method(FEM).Only the axisymmetric damage is considered *** using this method to calculate the dispersion relation of excited wave mode,the small modulus reduction can be *** the velocitY of excited guided wave and the time point at which the calculated dispersion curve changing,the damage can be *** this method can be used to find micro-cracks or material degradation at the early stage of fracture.