多孔材料在动态应力下的行为。第2部分:多尺度方法

Philippe Viot
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引用次数: 0

摘要

提出了一种多尺度方法来研究胞状材料在动载荷作用下的性能。所研究的聚合物泡沫的行为取决于本构材料和多孔结构的形态。本研究的细胞材料由毫米级多孔微珠组成,这些微珠本身由微观封闭细胞组成。提出了一种方法来模拟细胞材料的结构(珠状和细胞的尺度)的多尺度形态;它包括在不同尺度上实现简单的力学模型,以再现所观察到的复杂物理现象,并模拟泡沫的宏观响应。物理现象的观测和分析是多尺度模拟的第一步。本文介绍了用于观察和描述细胞材料结构的实验和数值方法,并在珠状和细胞级尺度上量化了这些结构的变形和损伤。研究了两种建模方法:一种是用有限元模型来表示柱头结构,另一种更新颖的方法是使用改进的离散元模型来模拟细胞的微观结构。
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Comportement des matériaux cellulaires sous sollicitations dynamiques. Partie 2 : approche multi-échelles
A multi scale methodology is proposed for the study of the cellular material behavior under dynamic loading. The behavior of polymeric foams studied depends on the constitutive material and the morphology of the porous structure. The cellular material of this study is constituted of millimetric porous beads, these beads are themselves constituted of microscopic closed cells. The methodology proposed to model the multi scale morphology of the structure (the scales of beads and cells) of the cellular material; it consists in implementing simple mechanical models at the different scales to reproduce the complex physical phenomenon observed and to model the macroscopic response of the foam. The observation and the analysis of physical phenomenon is the first step of the multi scale modeling. This paper describes the experimental and numerical methods used to observe and describe the structure of the cellular material, and quantify deformations and damages of these structures at the scales of beads and cells. Two ways of modeling were investigated: a finite-element model to represent the bead structure and another approach, more original, by the use of a modified discrete element model to model the microscopic structure of the cells.
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Mecanique & Industries
Mecanique & Industries 工程技术-工程:机械
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