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Axial crushing of triaxially braided composite tubes at quasi-static and dynamic rates

机译：三轴编织复合管的准静态和动态速率轴向破碎

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摘要

This paper presents the results of an experimental investigation into the behaviour of braided CFRP tubes subjected to quasi-static and dynamic axial crushing. Tubes of six different geometries, with round, rectangular or square cross-sections, with 2-4 plies of triaxial braids, were tested. Two types of square tubes were also tested with a plug initiator. Comparisons were made by examining the failure modes, load-displacement curves, specific energy absorption (SEA), and the ratio of the peak load to the average progressive crush load. When tested without a plug initiator, the crush characteristics of these tubes differed significantly under the two loading rates. Under quasi-static crush, tubes showed a greater tendency to fail in an unstable manner, characterized by global buckling, folding of the walls and crushing at both ends of the tube. Therefore, quasi-static crush testing should be used with caution when evaluating dynamic response of a structure. In dynamic testing, seven out of the eight configurations failed in a stable manner, with damage initiating at the bottom and propagating up the length of the tube in a splaying type failure mode. The smaller square and the round tubes performed the best, displaying higher SEA and lower load ratio values. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文介绍了对编织CFRP管在准静态和动态轴向挤压下的行为进行实验研究的结果。测试了具有2-4个三轴编织层的圆形，矩形或正方形横截面的六种不同几何形状的管。两种类型的方管也用塞子引发器进行了测试。通过检查失效模式，载荷-位移曲线，比能量吸收（SEA）以及峰值载荷与平均渐进挤压载荷之比进行比较。在没有塞子起爆器的情况下进行测试时，在两种加载速率下，这些管的抗压特性明显不同。在准静态挤压下，管子表现出更大的失稳趋势，表现为整体弯曲，壁面折叠和管子两端挤压。因此，在评估结构的动力响应时应谨慎使用准静态挤压试验。在动态测试中，八种配置中有七种以稳定的方式失败，在展开型失效模式下，损坏从底部开始并沿管的长度传播。较小的方形管和圆形管性能最好，显示较高的SEA和较低的负载比值。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2016年第12期|197-206|共10页
  • 作者

    McGregor Carla; Vaziri Reza; Poursartip Anoush; Xiao Xinran;

  • 作者单位

    Univ British Columbia, Dept Civil Engn, Composites Grp, Vancouver, BC, Canada|Univ British Columbia, Dept Mat Engn, Vancouver, BC, Canada;

    Univ British Columbia, Dept Civil Engn, Composites Grp, Vancouver, BC, Canada|Univ British Columbia, Dept Mat Engn, Vancouver, BC, Canada;

    Univ British Columbia, Dept Civil Engn, Composites Grp, Vancouver, BC, Canada|Univ British Columbia, Dept Mat Engn, Vancouver, BC, Canada;

    Michigan State Univ, Dept Mech Engn, Composite Vehicle Res Ctr, E Lansing, MI 48824 USA;

  • 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

    Braided composite tubes; Axial impact; Progressive crushing; Energy absorption; Rate effects;

    机译：编织复合管;轴向冲击;渐进破碎;能量吸收;速率效应;

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