Decomposition of the Two Lowest Lamb modes in a Bonded Plate

作     者：王小民 廉国选 李明轩 

作者机构：InstituteofAcousticsChineseAcademyofSciencesBeijing100080 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2003年第20卷第7期

页      面：1084-1087页

核心收录：

学科分类：07[理学] 08[工学] 070206[理学-声学] 0805[工学-材料科学与工程（可授工学、理学学位）] 082503[工学-航空宇航制造工程] 0802[工学-机械工程] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 0702[理学-物理学] 

基　　金：国家自然科学基金 

主　　题：stiffness Lamb speed Velocimetry Speed measurement phase velocity Lowest 

摘      要：Based on the expression of the dispersion equation of Lamb waves in an adhesive two-layered plate presented in our previous paper [Chin. Phys. Lett. 18(2001)1483], the two lowest Lamb modes, the symmetric mode S_0 and the antisymmetric mode A_0 are successfully decomposed in the low-frequency regime. Relations between the rigidity of the bond and the velocity of the two Lamb modes are found, which lay a foundation for the estimation of the bond rigidity of the adhesive plate. The influence of the variations of the bond rigidity in terms of the stiffness constants K_N and K_T of the spring model on the velocity of the two Lamb modes is discussed and numerically evaluated. Numerical results indicate that the deterioration of the bond rigidity causes the phase velocity decrease for Lamb modes of the two lowest order, thus having a possibility for the evaluation of the bonding state of the adhesive plate by using ultrasonic wave velocity measurement.