Healing of carbon fibre-epoxy composite T-joints using mendable polymer fibre stitching

被引:53
作者
Yang, T. [1 ,2 ]
Zhang, J. [2 ]
Mouritz, A. P. [2 ]
Wang, C. H. [2 ]
机构
[1] Tianjin Polytech Univ, Sch Mech Engn, Tianjin 300387, Peoples R China
[2] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Sir Lawrence Wackett Aerosp Res Ctr, Melbourne, Vic 3083, Australia
基金
澳大利亚研究理事会;
关键词
Polymer matrix composites; Delamination; Mechanical testing; Stitching; FATIGUE CRACKS; DAMAGE; FAILURE;
D O I
10.1016/j.compositesb.2012.08.022
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper presents an experimental investigation into a novel stitching technique for the toughening and healing of composite T-joints. Carbon fibre-epoxy T-joints were stitched using mendable poly(ethylene-co-methacrylic acid) (EMAA) thermoplastic filaments to form a three-dimensional healing polymer network in the stiffener, web and flange sections. The stitched network created a unique composite joint having the synergistic combination of high toughness and multiple healing repair of delamination and matrix cracks. The stitched network increased the delamination toughness of the T-joint under tension (stiffener pull-off) loading by the thermoplastic filaments bridging the fractured sections and thereby generating bridging traction (crack closure) loads. The delamination toughening induced by the mendable stitched network was determined using mode I interlaminar fracture testing. It was discovered that thermal activation of the stitched network resulted in partial repair of delamination and matrix cracks and substantial recoveries (more than 50%) in the stiffness, ultimate load and energy absorption properties of the fractured T-joint. The healing and partial property restoration of the mendable T-joint was repeatable for multiple healing processes. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1499 / 1507
页数:9
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