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首页> 外文期刊>International Journal of Solids and Structures >Modelling of micro-inertia effects in closed-cell foams with application to acoustic and shock wave propagation
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Modelling of micro-inertia effects in closed-cell foams with application to acoustic and shock wave propagation

机译：闭孔泡沫中微惯性效应的建模及其在声波和冲击波传播中的应用

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摘要

A continuum approach is proposed to describe micro-inertia effects in closed-cell foams using a micromechanical method. An initially spherical unit-cell was considered and the influence of inertia at the unit-cell level was characterised with the use of a dynamic homogenisation technique. The contribution of micro-inertia appears in the form of a dynamic component of the macroscopic stress. A closed-form expression of the dynamic stress was obtained. The proposed modelling was applied to acoustic and shock wave propagation. In both cases, the influence of micro-inertia was found to be significant. The obtained results are in good agreement with existing data of the literature, provided by micromechanically accurate finite element computations and experiments. The proposed model is aimed to enhance continuum models of foam materials by taking into account the contribution of micro-inertia. (C) 2016 Elsevier Ltd. All rights reserved.
机译：提出了一种连续的方法来描述使用微机械方法在闭孔泡沫中的微惯性效应。考虑了最初的球形晶胞，并使用动态均质技术表征了晶胞水平上的惯性影响。微观惯性的贡献以宏观应力的动态分量的形式出现。获得了动态应力的闭合形式。所提出的模型被应用于声波和冲击波的传播。在这两种情况下，都发现微惯性的影响是显着的。所得结果与文献中的现有数据非常吻合，这些文献是由微机械精确的有限元计算和实验提供的。所提出的模型旨在通过考虑微惯性的贡献来增强泡沫材料的连续模型。 （C）2016 Elsevier Ltd.保留所有权利。

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