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Creep-buckling of hexagonal honeycombs with dual imperfections

机译：具有双重缺陷的六角形蜂窝的蠕变屈曲

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摘要

The creep-buckling of hexagonal honeycombs with dual imperfections of variable-thickness, cell-edge, cross-section and non-straight profile of cell edges is theoretically analyzed here. By assuming that the material making up cell edges follows power law creep, the theoretical expression for describing the failure time for the onset of creep-buckling of hexagonal honeycombs with plateau borders and curved cell edges is derived. Theoretical results indicate that the effects of dual imperfections on the failure time for the onset of creep-buckling are more significant than those of single imperfection. Moreover, the required normalized compressive stress for hexagonal honeycombs with dual imperfections in a given failure time can be directly estimated from the product of that with single imperfections. In addition, it is found that creep-buckling is more likely to occur when imposed compressive stress is close to elastic buckling strength. But, creep-bending dominates when imposed compressive stress becomes much smaller. The normalized compressive stress for a transition from creep-buckling to creep-bending is affected significantly by the curvature of cell edges but slightly by the solid distribution in cell edges.
机译：在理论上分析了六边形蜂窝的蠕变屈曲，其具有可变厚度，孔边缘，横截面和非直线轮廓双重缺陷。通过假设构成孔边缘的材料遵循幂律蠕变，推导了描述具有平台边界和弯曲孔边缘的六角形蜂窝蠕变屈曲开始的失效时间的理论表达式。理论结果表明，双重缺陷对蠕变屈曲开始失效时间的影响比单一缺陷更为显着。此外，在给定的失效时间内具有双重缺陷的六角形蜂窝所需的归一化压缩应力可以直接从具有单一缺陷的六角形蜂窝的乘积中直接估算。另外，发现当施加的压缩应力接近弹性屈曲强度时，蠕变屈曲更可能发生。但是，当施加的压缩应力变得小得多时，蠕变弯曲将占主导地位。从蠕变屈曲到蠕变弯曲的归一化压缩应力受单元格边缘曲率的影响很大，而单元格边缘中的固体分布则略有影响。

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  • 来源
    《Composite Structures》 |2009年第1期|143-150|共8页
  • 作者

    Ting-Jung Chen; Jong-Shin Huang;

  • 作者单位

    Department of Civil Engineering, National Cheng Kung University, Taiwan, Taiwan 70101, ROC;

    Department of Civil Engineering, National Cheng Kung University, Taiwan, Taiwan 70101, ROC;

  • 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

    honeycomb; creep-buckling; creep-bending; imperfection;

    机译：蜂窝;蠕变屈曲蠕变弯曲不完美;

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