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Bearing damage characteristics of fibre-reinforced countersunk composite bolted joints subjected to quasi-static shear loading

机译：准静态剪切载荷作用下的纤维增强埋头复合螺栓连接的轴承损伤特性

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摘要

This paper studies the progression of damage in carbon fibre-reinforced polymer (CFRP) countersunk composite bolted joints (CBJs) with neat-fit clearance, subjected to quasi-static loading. Damage mechanisms, comprising of fibre buckling and breakage, matrix damage, shear damage and inter-laminar delamination within the CFRP composite parts of the joints have been studied. Load-displacement curves, X-ray and optical microscopic images in single-and three-bolt CBJs were used to investigate damage and deformation characteristics. The observations were then employed to further investigate the type of failure and the extent of damage. The evolution of damage within the composite parts was correlated to the failure characteristics of the joints: It was found that the type and extension of damage is strongly correlated with the ultimate failure load point of the joint in single-bolt CBJs. A combined inter/intra-laminar damage consisting of fibre cluster breakage, extensive fibre buckling, debonding and delamination was observed at the ultimate failure load. This study was then extended to three-bolt CBJ where damage surrounding each bolt and its corresponding failure load was strongly correlated: The final study showed that the ultimate failure point in single-bolt CBJ and the first-bolt-failure point in three-bolt CBJ correspond to the composite plies undergoing intra-laminar damage with the size reaching to the edge of the countersunk head. This damage developed extensively through the thickness of the composite parts underneath the countersink, and in the direction opposite to the loading direction. Outside the countersunk head, debonding and delamination were found to be the dominant damage driving mechanisms. Finally, a new design rule has been proposed to predict the response of multi-bolt joints (damage area and failure load) by using the response in single-bolt CBJ as an initial baseline. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文研究了在准静态载荷下具有整洁配合间隙的碳纤维增强聚合物（CFRP）埋头复合螺栓连接（CBJs）的破坏进程。研究了接头的CFRP复合材料部件中的纤维屈曲和断裂，基体损伤，剪切损伤和层间分层等损伤机理。使用单螺栓和三螺栓CBJ的载荷-位移曲线，X射线和光学显微图像研究损伤和变形特性。然后，将这些观察结果用于进一步研究故障的类型和损坏的程度。复合零件内损伤的发展与接头的破坏特性有关：发现在单螺栓CBJ中，损伤的类型和延伸与接头的最终破坏载荷点密切相关。在最终破坏载荷下，观察到了层间/层内综合损害，包括纤维簇断裂，广泛的纤维屈曲，脱粘和分层。然后，该研究扩展到三螺栓CBJ，其中每个螺栓周围的损坏与相应的破坏载荷密切相关：最终研究表明，单螺栓CBJ的最终破坏点与三螺栓的第一螺栓失效点CBJ对应于遭受层内损伤且其尺寸达到埋头头部边缘的复合层。这种损坏是通过埋头孔下面的复合零件的厚度，并沿与加载方向相反的方向广泛产生的。在埋头之外，发现脱胶和分层是主要的破坏驱动机制。最后，提出了一种新的设计规则，通过使用单螺栓CBJ中的响应来预测多螺栓接头的响应（损坏区域和破坏载荷）。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Composite Structures》 |2017年第15期|184-192|共9页
  • 作者

    Nezhad Hamed Yazdani; Egan Brian; Merwick Fiachra; McCarthy Conor T.;

  • 作者单位

    Univ Limerick, Fac Sci & Engn, Res Sch Engn, Bernal Inst,Irish Ctr Composites, Limerick, Ireland|Cranfield Univ, Sch Aerosp Transport & Mfg, Enhanced Composites & Struct Ctr, Coll Rd, Cranfield MK43 0AL, Beds, England;

    Univ Limerick, Fac Sci & Engn, Res Sch Engn, Bernal Inst,Irish Ctr Composites, Limerick, Ireland|Wood Grp Kenny, Galway Technol Pk, Galway, Ireland;

    Univ Limerick, Fac Sci & Engn, Res Sch Engn, Bernal Inst,Irish Ctr Composites, Limerick, Ireland|BASE Ltd UK, Innovat Ctr, Northern Ireland Sci Pk,Queens Rd, Belfast BT3 9DT, Antrim, North Ireland;

    Univ Limerick, Fac Sci & Engn, Res Sch Engn, Bernal Inst,Irish Ctr Composites, Limerick, Ireland;

  • 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

    Composite bolted joint; Intra-laminar damage; Fibre breakage; Delamination; Debonding; Fastener failure;

    机译：复合螺栓连接;层内损伤;纤维断裂;脱层;脱胶;紧固件失效;

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