Transmission of ultrasonic waves at oblique incidence to composite laminates with spring-type interlayer interfaces
Transmission of ultrasonic waves at oblique incidence to composite laminates with spring-type interlayer interfaces
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DOI：
10.1121/1.4934265
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发表时间：
2015-11-01
影响因子：
2.4
通讯作者：
Biwa, Shiro
中科院分区：
文献类型：
--
作者：
Ishii, Yosuke;Biwa, Shiro
采用刚度矩阵法对超声波斜入射复合材料层合板的透射特性进行了理论分析。该分析考虑到存在薄树脂丰富的区域之间的相邻层片作为弹簧型接口与正常和剪切刚度。结果表明，频率、层间刚度和入射角对纵向波在水中单向层合板中的振幅透射系数有显著影响。利用Floquet定理，计算了无限延伸层合板结构的色散关系，并与有限厚度层合板的透射系数进行了比较。这表明Floquet波位于带隙中的频率和界面刚度的范围与有限层结构的透射系数相对较小的情况一致，表明即使在有限层数的层合板中也会出现带隙。实验得到了11层碳-环氧单向复合材料层合板在不同频率和入射角下的振幅透射系数。实验结果中观察到的低透射区，这是由于准纵波的临界角和布拉格反射，示出有利的理论相比。(C)2015年美国声学学会。
The transmission characteristics of ultrasonic waves at oblique incidence to composite laminates are analyzed theoretically by the stiffness matrix method. The analysis takes into account the presence of thin resin-rich regions between adjacent plies as spring-type interfaces with normal and shear stiffnesses. The amplitude transmission coefficient of longitudinal wave through a unidirectional laminate immersed in water is shown to be significantly influenced by the frequency, the interlayer interfacial stiffnesses, and the incident angle. Using Floquet's theorem, the dispersion relation of the infinitely extended laminate structure is calculated and compared to the transmission coefficient of laminates of finite thickness. This reveals that the ranges of frequency and interfacial stiffnesses where the Floquet waves lie in the band-gaps agree well with those where the transmission coefficient of the finite layered structure is relatively small, indicating that the band-gaps appear even in the laminate with a finite number of plies. The amplitude transmission coefficient for an 11-ply carbon-epoxy unidirectional composite laminate is experimentally obtained for various frequencies and incident angles. The low-transmission zones observed in the experimental results, which are due to the critical angle of the quasi-longitudinal wave and the Bragg reflection, are shown to be favorably compared with the theory. (C) 2015 Acoustical Society of America.