弱粘接界面固-固界面波特性及与界面粘接性质关系数值研究  

Numerical study of solid-solid interface wave properties and its relation with interface bonding conditions

作　　者：鞠昊男 胡文祥[1] JU Haonan;HU Wenxiang(Institute of Acoustics,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学声学研究所,上海200092

出　　处：《声学技术》2021年第1期9-13,共5页Technical Acoustics

基　　金：国家自然科学基金(11774264)资助项目。

摘　　要：根据两固体粘接结构在不同粘接强度下的弹簧模型边界条件,通过傅里叶积分变换方法进行波动方程求解,理论分析和数值计算了相近横波速度的两种固体间界面波的频散及衰减特性。计算结果表明,当切向弹簧劲度系数从滑移粘接界面向完好粘接界面逐渐变化时,界面波的频散特性随之变化。在此基础上进一步计算了不同界面粘接条件下法向线源脉冲激发的界面波瞬态信号,可以更直观地观察不同粘接界面条件时界面波的信号特征与传播特性,包括频散特征、幅度变化等。采用完全在固-固界面激发、同时在界面接收的新方式,研究了不同界面特性玻璃-钢界面波的频散特性及瞬态波形,发现了不同于其他研究的界面波的独特特性,这些研究结果为进一步基于界面波传播特性进行粘接界面特性的定量和定性超声检测与评价提供了理论依据以及检测和表征的手段。According to the boundary conditions of spring model for the interface between two solid materials,the integral representations of solutions are obtained by applying the Fourier transform to the wave equations.The dispersion and attenuation characteristics of the interface wave are analyzed theoretically and calculated numerically for two solid materials with similar shear wave velocity.The results show that when the tangential stiffness gradually changes from the slip boundary to the perfect boundary,the dispersion characteristics of the interface wave change accordingly.On this basis,the transient interface wave signals excited by a linear laser pulse source under different interface bonding conditions are further calculated.The signal characteristics and propagation characteristics of the interface waves under different interface bonding conditions can be more intuitively observed,including dispersion characteristics and amplitude variation.These results provide theoretical basis and means of detection and characterization for further quantitative and qualitative ultrasonic detection and evaluation based on interfacial wave propagation characteristics.

关 键 词：弱粘接 界面波 频散特性 

分 类 号：O426.4[理学—声学]