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Image-based correlation between the meso-scale structure and deformation of closed-cell foam

机译：中尺度结构与闭孔泡沫变形之间基于图像的相关性

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摘要

In the correlation between structural parameters and compressive behaviour of cellular materials, previous studies have mostly focused on averaged structural parameters and bulk material properties for different samples. This study focuses on the meso-scale correlation between structure and deformation in a 2D foam sample generated from a computed tomography slice of Alporas™ foam, for which quasi-static compression was simulated using 2D image-based finite element modelling. First, a comprehensive meso-scale structural characterisation of the 2D foam was carried out to determine the size, aspect ratio, orientation and anisotropy of individual cells, as well as the length, straightness, inclination and thickness of individual cell walls. Measurements were then conducted to obtain the axial distributions of local structural parameters averaged laterally to compression axis. Second, the meso-scale deformation was characterised by cell-wall strain, cell area ratio, digital image correlation strain and local compressive engineering strain. According to the results, the through-width sub-regions over an axial length between the average flower bound) and the maximum (upper bound) of cell size should be used to characterise the meso-scale heterogeneity of the cell structure and deformation. It was found that the first crush band forms in a sub-region where the ratio of cell-wall thickness to cell-wall length is a minimum, in which the collapse deformation is dominated by the plastic bending and buckling of cell walls. Other morphological parameters have secondary effect on the initiation of crush band in the 2D foam. The finding of this study suggests that the measurement of local structural properties is crucial for the identification of the 'weakest' region which determines the initiation of collapse and hence the corresponding collapse load of a heterogeneous cellular material.
机译：在细胞材料的结构参数与压缩行为之间的相关性中，以前的研究主要集中在不同样品的平均结构参数和散装材料特性上。这项研究的重点是从Alporas™泡沫计算机X线断层扫描切片生成的2D泡沫样品中，结构与变形之间的细观相关性，使用基于2D图像的有限元建模对准静态压缩进行了模拟。首先，对二维泡沫进行了中观尺度的结构表征，以确定单个泡孔的尺寸，纵横比，取向和各向异性，以及单个泡孔壁的长度，笔直度，倾斜度和厚度。然后进行测量以获得横向于压缩轴平均的局部结构参数的轴向分布。其次，通过细胞壁应变，细胞面积比，数字图像相关应变和局部压缩工程应变表征中尺度变形。根据结果​​，应使用平均花边界和最大（上部边界）细胞大小之间的轴向宽度贯穿子区域来表征细胞结构和形变的介观异质性。已经发现，第一挤压带形成在其中单元壁厚度与单元壁长度之比最小的子区域中，其中塌陷变形主要由单元壁的塑性弯曲和屈曲控制。其他形态学参数对2D泡沫中压溃带的产生具有辅助作用。这项研究的发现表明，局部结构性质的测量对于确定“最弱”区域至关重要，而“最弱”区域决定了崩塌的开始，因此决定了异质细胞材料的相应崩塌载荷。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|27-39|共13页
  • 作者

    Yongle Sun; Xun Zhang; Zhushan Shao; Q.M. Li;

  • 作者单位

    School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Sackville Street, Manchester M13 9PL, UK;

    Henry Moseley X-ray Imaging Facility, School of Materials, The University of Manchester, Upper Brook Street, Manchester M13 9PL, UK;

    School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China;

    School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Sackville Street, Manchester M13 9PL, UK,State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminium foam; Cell structure; Crushing; Computed tomography; Image-based modelling;

    机译：泡沫铝细胞结构;压碎;CT检查;基于图像的建模;

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