Energy Absorption Behaviour of Metallic Cellular Materials Under Impact Loading

doi:10.7652/xjtuxb201311019

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Energy Absorption Behaviour of Metallic Cellular Materials Under Impact Loading

更新时间：2025-07-09

- Energy Absorption Behaviour of Metallic Cellular Materials Under Impact Loading
- Vol. 47, Issue 11, Pages: 105-112(2013)
- 作者机构：
  
  西安交通大学机械结构强度与振动国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201311019
  CLC： O347
- Online First：10 November 2013，
  
  Published：2013
- 稿件说明：
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Energy Absorption Behaviour of Metallic Cellular Materials Under Impact Loading[J]. 2013, 47(11): 105-112.
DOI：

Energy Absorption Behaviour of Metallic Cellular Materials Under Impact Loading[J]. 2013, 47(11): 105-112. DOI： 10.7652/xjtuxb201311019.

摘要

基于显微CT扫描信息

建立泡沫金属材料二维细观有限元模型

考虑不规则胞孔的不均匀分布

根据试验结果拟合孔壁材料的弹塑性本构参数

分析了泡沫金属材料在动态压缩过程中的变形特性和弹塑性波的传播

重点讨论了泡沫金属作为防护材料的吸能机理和吸能特性。结果表明

对于相对密度为0.3的泡沫金属

在高速压缩至应变0.8的整个过程中

塑性波在泡沫金属试件中发生2次反射

试件经历3次压缩过程。相应地

泡沫金属的动能-应变曲线可以分为初始上升段、下降段和二次上升段3个阶段。内能和总能量变化曲线均单调增加。动能在第一次压缩结束时达到极大值

在第二次压缩结束时达到极小值; 冲击速度越大

动能、内能和总能量均增长越快

动能在总能量中的比例逐渐增加

而内能在总能量中的比例减小。

Abstract

A two-dimensional finite element model is created from a tomographic image of aluminum foams

which represents the cell shape and geometric distribution of real foams. To determine the mechanical properties of cell-walled material

the uniaxial stress versus strain curve

predicted numerically for the aluminum foam

is fitted to that measured experimentally. The mechanism of compressive deformation

shock wave propagation and the energy absorption capacity of metallic cellular materials under high speed compression are mainly discussed. When the specimen of metallic cellular material with relative density 0.3 is compressed up to the normal strain of 0.8 under impact loading

the plastic wave reflects twice in the specimen

and the specimen undergoes three compression processes. Accordingly

the simulated kinetic energy curves of the metallic cellular material under high impact velocities can be divided into three segments: the initial rise segment

the descent segment and the second rise segment. The internal energy and total energy curves show monotone increasing for different impact velocities. The kinetic energy curves reach maximum values and minimum values at the end of first and second compression

respectively. As for high velocity impact

the slope values of the kinetic energy

internal energy and total energy curves increase. Simultaneously

the proportion of kinetic energy in total energy increases whilst the proportion of internal energy decreases with the increase in compression velocity.

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references

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