On the Simulation of the Influence of Defects on Immersed Plane Periodic Multilayer Viscoelastic Media

声学期刊(英文) Pub Date : 2021-06-18 DOI:10.4236/oja.2021.112002

Massaï Hatoumva, E. Siryabe, P. Maréchal, G. Ntamack, G. Betchewe

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Abstract

This work deals with the study of a plane periodic multilayer structure in which the elementary stack consists of two plates in contact: one in aluminum (AL) and the other one in polyethylene (PE). These isotropic materials, present a high acoustic impedance contrast. The attenuation of the longitudinal and transverse waves is taken into account in the polyethylene but neglected in the aluminum plate. The effect of different defects is analyzed. Firstly, we focus on the effect of the presence of grease inclusion in the polyethylene plate (considering the two plates of the elementary stack in perfect contact). Secondly, the effect of disbond simulated by the insertion of a thin Teflon layer between the interfaces of the two layers constituting the elementary stack of the multilayer structure is investigated. Finally, the effect of the stacking sequences of the multilayer is analyzed. In order to obtain the effective acoustic parameters of polyethylene layer, allowing to evaluate the reflection and transmission coefficients using the stiffness matrix method developed by Rokhlin et al., four homogenization models are analyzed, then the best one to our configuration is chosen. The comparison of the simulation results is carried out.

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缺陷对浸入面周期多层粘弹性介质影响的模拟研究

本工作研究了平面周期多层结构，其中基本堆叠由两个接触的板组成：一个在铝（AL）中，另一个在聚乙烯（PE）中。这些各向同性材料呈现出高的声阻抗对比度。在聚乙烯中考虑了纵波和横波的衰减，但在铝板中忽略了。分析了不同缺陷的影响。首先，我们关注聚乙烯板中存在油脂夹杂物的影响（考虑到基本堆叠的两个板完全接触）。其次，通过在构成多层结构的基本堆叠的两层的界面之间插入一层薄的特氟龙层来模拟脱粘效应。最后，分析了多层膜堆叠顺序的影响。为了获得聚乙烯层的有效声学参数，使用Rokhlin等人开发的刚度矩阵方法来评估反射系数和透射系数，分析了四个均匀化模型，然后选择了适合我们配置的最佳模型。并对仿真结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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声学期刊(英文)

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