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Dynamic deformation and failure process of quasi-closed-cell aluminum foam manufactured by direct foaming technique

机译:直接发泡技术制造的准闭孔铝泡沫的动态变形和故障过程

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摘要

The application of cellular structure for energy dissipation requires the investigation on the deformation and failure process of the foam under dynamic loading. In this study, the split-Hopkinson pressure bar technique with high speed video camera was used to directly observe the dynamic deformation in quasi-closed-cell aluminum foam fabricated by an in-house direct foaming methodology. The characterization of cellular structure was first performed on the developed aluminum foam, indicating that the cell size follows a log-normal distribution. The measurements revealed that the deformation mode varies with the strain rate. After that an experimentally validated X-ray micro-computed tomography based 3D finite element model of the as-fabricated specimen was established to predict the stress distribution and deformation history under impact loading, and correlated to the experimental observations to explore the deformation mechanisms. It was found that shear band is formed after peak stress. The dynamic deformation and failure process of the quasi-closed-cell aluminum foam result from the coexistence of cell wall bending and buckling, cell collapse and shear traction induced tearing breakage.
机译:蜂窝织结构对能量耗散的应用需要调查动态载荷下泡沫的变形和失效过程。在这项研究中,使用高速摄像机的分流霍普金森压杆技术用于直接观察由内部直接发泡方法制造的准闭合电池铝泡沫中的动态变形。首先在开发的铝泡沫上进行细胞结构的表征,表明电池尺寸遵循对数正态分布。测量表明,变形模式随应变速率而变化。之后,建立基于实验验证的基于X射线微计算的基于AS制造标本的3D有限元模型,以预测冲击载荷下的应力分布和变形历史,并与探索变形机制的实验观察结果相关。发现剪切带在峰值应力之后形成。拟闭电池铝泡沫的动态变形和故障过程由细胞壁弯曲和弯曲,细胞塌陷和剪切牵引引起的撕裂断裂。

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