金属板件中微裂纹的非线性超声表征方法研究  

Characterization of micro-crack in metal plane using nonlinear ultrasonic waves

作　　者：阎红娟 刘峰斌[1] 潘勤学 Yan Hongjuan;Liu Fengbin;Pan Qinxue(College of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China;School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《现代制造工程》2018年第4期17-21,共5页Modern Manufacturing Engineering

基　　金：国家自然科学基金资助项目(51305028;51575004);北方工业大学科研启动基金资助项目

摘　　要：研究非线性超声波动规律,确定二阶、三阶相对非线性系数与基波、谐波幅值之间的关系。建立微裂纹非线性弹簧模型,研究在循环载荷作用下微裂纹形状尺寸(长度和宽度)变化对超声接收信号谐波幅值数的影响,确定二阶相对非线性系数与微裂纹形状尺寸的关系,随着微裂纹长度增加,二阶相对非线性系数随之增加;随着微裂纹宽度增加,二阶相对非线性系数随之减小。将二阶相对非线性系数与裂纹形状非线性弹簧模型与实验结果进行对比,具有较好的一致性。研究了三阶相对非线性系数与微裂纹形状尺寸的关系,随着微裂纹长度增加,三阶相对非线性系数随之增加;随着微裂纹宽度增加,三阶相对非线性系数随之减小。The nonlinear ultrasonic wave rule is studied. The relationships of second or third order relative nonlinear ultrasonic co- efficients versus fundamental and harmonic amplitudes are determined. The nonlinear spring model of micro-crack is set up. The relationships of Second Order Relative Nonlinear Ultrasonic Coefficients （SORNC） versus dimensions of micro-cracks are deter- mined. The SORNC increase with the length of micro-crack and the SORNC decrease with the width of micro-crack. The data pre- dicted by the model is consisted with the experimental data. The Third Order Relative Nonlinear Ultrasonic Coefficients （TORNC） increase with the length of micro-crack and the TORNC decrease with the width of micro-crack.

关 键 词：非线性超声 三阶相对非线性系数 微裂纹 非线性弹簧模型 

分 类 号：TB553[理学—物理]