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Statistical finite element analysis of the buckling behavior of honeycomb structures

机译：蜂窝结构屈曲行为的统计有限元分析

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摘要

The main key performance factors of honeycombs are represented by the ability to withstand through-thickness compression and to absorb energy by plastic deformation of the cell walls. The knowledge of the constituent material properties, including the sensitivity of these structures to material defects, and of the folding mechanism occurring during the crushing mode represents a basic step to perform reliable finite element analyses able to accurately reproduce the behavior of such structures. The present paper reports a comprehensive study of the compressive response of hexagonal honeycomb structures made of phenolic resin-impregnated aramid paper (Nomex®); the compressive response is numerically investigated and compared with experimental results. A shell model of a representative single cell made of expanded Nomex has been created using the implicit ABAQUS finite element solver. Imperfections due to the manufacturing process are taken into account including material imperfections (elastic modulus variability) and geometrical defects (thickness variability). Imperfections are included in the model by defining different material and thickness properties for each element according to a pre-defined statistical distribution. The effects of imperfections on the honeycomb structure behavior are investigated. The predicted structural response, numerically obtained using different sets of imperfections, shows a good correlation with experimental results.
机译：蜂窝的主要关键性能因素由承受厚度穿透和通过细胞壁塑性变形吸收能量的能力表示。组成材料属性的知识，包括这些结构对材料缺陷的敏感性，以及在破碎模式期间发生的折叠机制的知识，是执行可靠的有限元分析的基本步骤，该分析能够准确地再现此类结构的行为。本文对由酚醛树脂浸渍的芳纶纸（Nomex®）制成的六边形蜂窝结构的压缩响应进行了全面研究。对压缩响应进行了数值研究，并与实验结果进行了比较。使用隐式ABAQUS有限元求解器已创建了由扩展的Nomex制成的具有代表性的单个单元格的壳模型。考虑到由于制造过程而产生的缺陷，包括材料缺陷（弹性模量可变性）和几何缺陷（厚度可变性）。通过根据预定义的统计分布为每个元素定义不同的材料和厚度属性，可以将缺陷包括在模型中。研究了缺陷对蜂窝结构行为的影响。使用不同的缺陷集数值获得的预测结构响应显示出与实验结果的良好相关性。

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  • 来源
    《Composite Structures》 |2013年第11期|240-255|共16页
  • 作者

    Domenico Asprone; Ferdinando Auricchio; Costantino Menna; Simone Morganti; Andrea Prota; Alessandro Reali;

  • 作者单位

    Department of Structures for Engineering and Architecture (DiSt), University of Naples, Federico 11, Via Claudio 21, 80125 Naples, Italy;

    Department of Civil Engineering and Architecture (DICAr), University of Pavia, Via ferrata 3, 27100 Pavia, Italy;

    Department of Structures for Engineering and Architecture (DiSt), University of Naples, Federico 11, Via Claudio 21, 80125 Naples, Italy;

    Department of Civil Engineering and Architecture (DICAr), University of Pavia, Via ferrata 3, 27100 Pavia, Italy;

    Department of Structures for Engineering and Architecture (DiSt), University of Naples, Federico 11, Via Claudio 21, 80125 Naples, Italy;

    Department of Civil Engineering and Architecture (DICAr), University of Pavia, Via ferrata 3, 27100 Pavia, Italy;

  • 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

    Imperfections; Nomex honeycomb; Buckling; Finite element analysis; Stochastic approach;

    机译：瑕疵;Nomex蜂窝;屈曲;有限元分析;随机方法;

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