| Decomposition of the Two Lowest Lamb modes in a Bonded Plate |
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| 作者姓名： | 王小民 廉国选 李明轩 |
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| 作者单位： | InstituteofAcoustics,ChineseAcademyofSciences,Beijing100080 |
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| 摘 要： | Based on the expression of the dispersion equation of Lame waves in an adhesive two-layered plate pressented in our proevious paper Chin,Phys,Lett,18(2001)1483],the two lowest Lamb modes,the symmetric mode S0 and the antisymmetric mode A0 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 KN and KT of the spring model on the velocity of the two Lamb modes in 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.
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| 关 键 词： | 航空技术 胶接技术 Lamb波 超声速度 传播方程 相称性模式 反对称性模式 低周波条件 加工技术 |
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