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Effects of cell size and cell wall thickness variations on the strength of closed-cell foams

机译：泡孔尺寸和泡孔壁厚变化对闭孔泡沫强度的影响

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摘要

In this work, the effects of cell size and cell wall thickness variations on the compressive and shear strengths of closed-cell foams were investigated using Laguerre tessellation models. It is found that the compressive and shear strengths of closed-cell foams decrease as cell size and cell wall thickness variations increase, and the compressive strength reduces more significantly. At a given level of variation, the effect of cell size variation on strength reduction is comparable to that of cell wall thickness variation on them. In the foam studied (M130 foam), cell wall thickness has a larger dispersion than cell size, and therefore is the main contributor to the strength reduction of the foam. In comparison to compressive and shear stiffnesses, cell size and cell wall thickness variations reduce compressive and shear strengths more significantly. Cell size variation results in strain concentration at the end of foam samples, thereby reducing the compressive strength of closed cell foams. Cell wall thickness variation leads to cell wall buckling and thus reduction in compressive and shear strengths of closed-cell foams. As cell size and cell wall thickness in foams become less uniform, the relationships of compressive and shear strengths to relative density become less linear. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在这项工作中，使用Laguerre镶嵌模型研究了泡孔尺寸和泡孔壁厚变化对闭孔泡沫的压缩强度和剪切强度的影响。发现闭孔泡沫的抗压强度和剪切强度随着孔尺寸和孔壁厚度变化的增加而降低，并且抗压强度更显着地降低。在给定的变化水平下，孔尺寸变化对强度降低的影响与孔壁厚度变化对它们的影响相当。在研究的泡沫（M130泡沫）中，孔壁厚度的分散度大于孔大小，因此是泡沫强度降低的主要因素。与抗压刚度和剪切刚度相比，孔尺寸和孔壁厚度的变化会更明显地降低抗压强度和抗剪强度。泡孔尺寸的变化会导致泡沫样品末端的应变集中，从而降低闭孔泡棉的抗压强度。孔道壁厚的变化会导致孔道壁弯曲，从而降低闭孔泡沫的抗压强度和剪切强度。随着泡沫中泡孔尺寸和泡孔壁厚度变得不太均匀，抗压强度和剪切强度与相对密度的关系变得越来越不线性。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Engineering Science》 |2017年第11期|220-240|共21页
  • 作者

    Chen Youming; Das Raj; Battley Mark;

  • 作者单位

    Wuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Hubei, Peoples R China|Univ Auckland, Dept Mech Engn, Ctr Adv Composite Mat, Auckland 1010, New Zealand;

    Univ Auckland, Dept Mech Engn, Ctr Adv Composite Mat, Auckland 1010, New Zealand|RMIT Univ, Sir Lawrence Wackett Aerosp Res Ctr, Sch Engn, GPO Box 2476, Melbourne, Vic 3001, Australia;

    Univ Auckland, Dept Mech Engn, Ctr Adv Composite Mat, Auckland 1010, New Zealand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Closed-cell foam; Laguerre tessellation; Cell size; Cell wall thickness; Strength;

    机译：闭孔泡沫;Laguerre镶嵌;孔大小;孔壁厚度;强度;

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