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首页> 外文会议>Symposium on Cellular Metals and Polymers; 20041012-14; Furth(DE) >Strain-hardening and damage of foamed aluminium during tensile deformation
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Strain-hardening and damage of foamed aluminium during tensile deformation

机译：拉伸变形过程中泡沫铝的应变硬化和损坏

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摘要

One of the most important targets in vehicle design is passive safety. Aluminium foam is an attractive material offering energy absorption to be used in light weight passive safety components. Foamed aluminium powder compacts are characterized by computed X-ray tomography (XCT). The cellular structure is transformed into a continuum by density mapping. The type of alloy, the mass density distribution and the skin of the foamed panels determine the stiffness, the tensile strength and the engineering strain to failure. Tensile specimens exhibit strain hardening beyond crack initiation in the samples' skin by crack bridging and load redistribution. The elastic properties of cellular specimens with skin can be described by a linear rule of mixture from the stiffness moduli of the core and the skin.
机译：车辆设计中最重要的目标之一是被动安全性。泡沫铝是一种有吸引力的材料，可吸收能量，可用于轻型被动安全组件。泡沫铝粉压块的特征在于计算机X射线断层扫描（XCT）。通过密度映射将细胞结构转化为连续体。合金的类型，质量密度分布和泡沫板的表皮决定了刚度，抗拉强度和破坏的工程应变。通过裂纹桥接和载荷重新分布，拉伸试样在试样表皮上的裂纹硬化超出了裂纹的萌生范围。带有皮肤的细胞标本的弹性特性可以根据芯和皮肤的刚度模量通过混合的线性规则来描述。

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