摘要
对金属下基底 -胶粘层 -金属上基底结构中的类Rayleigh(瑞利 )波传播特性进行了研究 .从粘弹的基本理论出发 ,通过Laplace Hankel(拉普拉斯 -汗克尔 )变换及转移矩阵技术建立起类Rayleigh波的频率方程 ,将粘接层视为Kelvin(开尔文 )体计算 ,分析了其粘弹模量对波频散关系的影响 .理论计算发现 ,粘弹体的粘滞项对频散低频段影响不大 ,但随着粘滞的增大对高频可产生影响 .最后 ,计算了粘滞对Sezawa(塞扎瓦 )模式及Saw(表面声波 )模式的衰减影响 .
The propagation of the like-Rayleigh waves in three layers adhesive structure is carried through in this paper.Based on the general viscoelastic theory,the characterization frequency equations are found by means of the Laplace-Hankel transform and matrix transfer method.Considering the adhesive layers as Kelvin model,the effects on frequency dispersion related to viscoelastic moduli are analyzed.It shows that the viscosity offers only little effects on the lower frequency region of the dispersion curve,and it has effects on the higher frequency region of the dispersion curve with the increasing of damping.Besides,the attenuation of the Saw mode and Sezawa mode are calculated caused by viscosity.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第8期1116-1120,共5页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目 (10 2 3 40 60 )
关键词
超声
粘弹性
表面波
衰减
ultrasonic
viscoelasticity
surface wave
attenuation
