Damage characteristics in 3D stitched composites with various stitch parameters under in-plane tension
Damage characteristics in 3D stitched composites with various stitch parameters under in-plane tension
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DOI：
10.1016/j.compositesa.2014.12.012
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发表时间：
2015-04-01
影响因子：
8.7
通讯作者：
Hoshi, Hikaru
中科院分区：
文献类型：
--
作者：
Yudhanto, Arief;Lubineau, Gilles;Hoshi, Hikaru
缝合三维增强是提高复合材料抗冲击性能的有效方法。然而，缝合，不利地影响复合材料的面内力学响应，并改变其损伤机制，由于缝合诱导的不规则性。利用X射线照相、X射线显微计算机断层扫描和数字图像相关技术（DIC），研究了缝纫密度和缝纫线直径这两个重要的缝纫参数对三维缝合多向复合材料面内拉伸损伤特性的影响。我们的研究表明，由于有效地阻止了边缘分层，用较粗的线缝合的复合材料表现出更好的拉伸强度。我们还发现缝纫线影响损伤行为。在90纤维细丝束的中间部分产生更多数量的横向裂纹;密集缝合减少了裂纹间距离。DIC能够识别出现在富含树脂的通道中的裂纹，并区分由于不同缝合密度而产生的应变场。(C)2015爱思唯尔有限公司版权所有。
Three-dimensional (3D) reinforcement by stitching is effective in improving the impact resistance of composites. Stitching, however, adversely affects the composite's in-plane mechanical responses, and alters its damage mechanisms due to stitch-induced irregularities. We experimentally investigate the effect of two important stitch parameters, stitch density and thread diameter, on the damage characteristics of 3D stitched multidirectional composites under in-plane tension using X-ray radiography, X-ray micro-computed tomography and digital image correlation (DIC). Our study shows that composites stitched with thicker thread exhibit improved tensile strength due to effective hindrance of edge-delamination. We also found that stitch thread affects damage behaviors. A higher number of transverse cracks develops in the middle portion of thin 90 fiber tows; the inter-crack distance is reduced by dense stitching. DIC is able to identify the cracks that appear in resin-rich channels and distinguish strain fields due to different stitch densities. (C) 2015 Elsevier Ltd. All rights reserved.