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Experimental determination of the structural properties and strengthening mechanisms of z-pinned composite T-joints

机译：Z钉复合T型接头的结构性能和增强机理的实验确定

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摘要

This paper presents an experimental investigation into the efficacy of z-pins to improve the structural properties of stiffened joints made of carbon/epoxy composite. Pull-off tests were performed on T-joints without z-pins or reinforced along the skin-stiffener bond-line with z-pins to volume contents of 0.5%, 2% or 4%. Testing was performed at different pull-off load angles between 0° and 45° to the stiffener to induce different proportions of normal (through-thickness) tensile and in-plane secondary bending stresses along the skin-stiffener bond-line. It was found that z-pins do not improve the stiffness or failure initiation load of T-joints, but they are effective at raising the ultimate failure strength, failure displacement, and absorbed energy capacity. These properties increase rapidly with the z-pin content, and maximum improvements of about 75% to the ultimate strength and over 600% to the total absorbed energy capacity were achieved at the highest pin content (4% by volume). The percent improvements to the structural properties are approximately the same for the different load angles, revealing that z-pins are equally effective at resisting bond-line cracking under normal tensile or secondary bending stresses. Fractograph-ic analysis revealed that z-pins increase the joint properties by creating bridging tractions across the bond-line crack between the stiffener and skin. The z-pins ultimately fail by a combination of debond-ing/pull-out from the adherends.
机译：本文对z销改善由碳/环氧树脂复合材料制成的刚性接头的结构性能进行了实验研究。对不带Z形销或沿带Z形销的皮肤加劲剂粘结线加固的T形接头进行拉拔试验，其体积含量为0.5％，2％或4％。测试是在与加劲肋0度至45度之间的不同拉力载荷角度下进行的，以沿蒙皮加劲肋粘结线引起不同比例的法向（厚度范围）拉伸和平面内二次弯曲应力。发现z销不能提高T形接头的刚度或破坏起始载荷，但可以有效地提高极限破坏强度，破坏位移和吸收能量的能力。这些特性随z-pin含量的增加而迅速增加，在最高pin含量（按体积计4％）下，最大强度提高了约75％，最大吸收能量提高了600％。对于不同的负载角度，结构性能的改善百分比大致相同，这表明z销在正常拉伸应力或二次弯曲应力下同样有效地抵抗了粘结层的开裂。分形学分析表明，z形销通过在加劲层和蒙皮之间的粘结层裂缝上产生桥接牵引力来提高接头性能。 Z钉最终会由于从被粘物上脱粘/拔出的组合而失效。

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  • 来源
    《Composite Structures》 |2011年第9期|p.2222-2230|共9页
  • 作者

    T.M. Koh; S. Feih; A.P. Mouritz;

  • 作者单位

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, CPO Box 2476, Melbourne, Victoria 3001, Australia;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, CPO Box 2476, Melbourne, Victoria 3001, Australia;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, CPO Box 2476, Melbourne, Victoria 3001, Australia;

  • 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

    polymer matrix composites; T-joints; Z-pins; through-thickness reinforcement;

    机译：聚合物基复合材料;T型接头;Z销;增厚;

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