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首页> 外文期刊>Advanced Composites Letters >Investigation Into the Effect of Edge Stitching on the Tensile Strength Fatigue Life of Co-cured Joints Between Cross-ply Adherends
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Investigation Into the Effect of Edge Stitching on the Tensile Strength Fatigue Life of Co-cured Joints Between Cross-ply Adherends

机译：边缘缝合对交叉粘合物之间共固化接头抗拉强度疲劳寿命影响的研究

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摘要

An experimental study was conducted to investigate the effect of stitching on the static and fatigue response and related failure modes of co-cured single-lap joints between composite adherends. Two cross-ply layups, [0_2/90]_s and [90/0_2]_s, were selected for the adherends, with the aim of studying the influence of the layer orientation at the joining interface (0'I-0'I for joints between [0_2/90]_s adherends and 90'I-90'I for joints with [90/0_2]_s adherends). It was found that stitching did not affect the static behaviour of [0_2/90]_s joints, but it resulted in a 36 percent increase in the static strength of joints between [90/0_2]_s adherends. However, stitching significantly improved the fatigue life of both [0_2/90]_s and [90/0_2]_s joints by extending the durations of both the crack nucleation and propagation stages. Direct observations indicated that the bridging action of stitches (which remained intact throughout the entire fatigue life of the joints) on delaminated adherends is the physical mechanism responsible for the extension of the crack propagation phase.
机译：进行了一项实验研究，以研究缝合对复合被粘物之间共固化单搭接接头的静态和疲劳响应及相关破坏模式的影响。为研究被粘物选择了两个交叉铺层[0_2 / 90] _s和[90 / 0_2] _s，目的是研究层界面在连接界面处的影响（0'I-0'I [0_2 / 90] _s被粘物与90'I-90'I之间的关节（对于[90 / 0_2] _s被粘物的关节）。发现缝合不会影响[0_2 / 90] _s关节的静态行为，但会导致[90 / 0_2] _s被粘物之间的关节静态强度提高36％。但是，缝合可以通过延长裂纹成核和扩展阶段的持续时间来显着提高[0_2 / 90] _s和[90 / 0_2] _s接头的疲劳寿命。直接观察表明，针迹（在接头的整个疲劳寿命中保持不变）对分层被粘物的桥接作用是造成裂纹扩展相扩展的物理机制。

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