承压界面接触特性超声检测  

Ultrasonic Testing on Contact State of Pressure Interfaces

作　　者：焦敬品[1] 曾宪超[1] 刘文华[1] 何存富[1] 吴斌[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《北京工业大学学报》2012年第6期807-812,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51075012);北京市科技新星计划资助项目(2007B012)

摘　　要：针对由于接触界面的非完好性,使得超声波在接触界面处传播呈现非线性效应问题,建立了一维纵波在承压界面传播的简化模型,利用界面处超声波透射系数表征界面刚度.在不同压力下,进行界面超声检测试验,归纳界面刚度系数与压力的幂律系数.结果表明,可利用超声波在接触界面的刚度系数和非线性系数等特征参数进行界面接触状态的评价.The non-perfection of contacting interfaces causes the non-trivial features including the contact acoustic nonlinearity （CAN） for ultrasound propagating through the interface. A simple model for one- dimensional longitudinal wave transmission through non-perfect interfaces is proposed, and the transmission coefficient is used to show the interface stiffness. Ultrasonic transmission experiments are carried out to investigate the contact state of the interface under different pressures, and the power-law relationship between the pressure and the stiffness coefficients is established by best fitting the measured ultrasound data. Results show that it is feasible to characterize the pressure-applied interfaces by using the transmission coefficients of the first and second order harmonics in transmitted ultrasonic waves.

关 键 词：界面 接触特性 非线性超声 界面刚度 透射系数 

分 类 号：TB55[理学—物理]