Further investigation of Delamination Reduction Trend for stitched composites
Further investigation of Delamination Reduction Trend for stitched composites
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DOI：
10.1016/j.compscitech.2015.08.019
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发表时间：
2015-10
影响因子：
9.1
通讯作者：
K. Tan;A. Yoshimura;N. Watanabe;Y. Iwahori;T. Ishikawa
中科院分区：
文献类型：
--
作者：
K. Tan;A. Yoshimura;N. Watanabe;Y. Iwahori;T. Ishikawa
本文旨在进一步研究最近提出的一种新的基于材料的分层减少趋势（DRT）缝合复合材料。DRT能够预测由于缝合的影响而导致的冲击引起的分层区域的有效减少。DRT简单地涉及两个参数：归一化脱层面积和缝合纤维体积分数，以表征缝合在冲击损伤抑制中的有效性。在这项工作中，准静态压痕（QSI）测试缝合复合材料的目的是提供新的观察，提供验证和了解DRT的局限性。再加上实验观察到的损伤机制的测试数据显示DRT的局限性，特别是在两个区域：第一，当损伤开始和脱层增长尚未开发;第二，当脱层扩展的边界条件和饱和的脱层损伤的影响已经发生。DRT的验证在这些区域之外的域中得到证明。调查进一步分析统计方法，使用三因子实验设计（DoE）。建立了针迹密度、缝纫线厚度和压痕位移对压痕脱层区域的主要影响和耦合作用关系。图形和统计结果为DRT提供了进一步的见解和验证。这项工作的新奇在于显示验证和理解的DRT的有效使用和准确预测缝合复合材料的分层损伤的限制。
This paper seeks to further investigate a recently proposed novel empirical-basedDelamination Reduction Trend(DRT) for stitched composites. The DRT is capable of predicting the effective reduction in impact-induced delamination area due to the influence of stitching. DRT simply relates two parameters: normalised delamination area and stitch fibre volume fraction, to characterize the effectiveness of stitching in impact damage suppression. In this work, quasi-static indentation (QSI) test is performed on stitched composites with the aim to offer new observations, provide validations and understand limitations in DRT. Test data coupled with experimentally observed damage mechanisms reveal limitations of DRT, particularly across two regions: first, when damage is initiated and delamination growth has not been developed; second, when delamination propagation is influenced by boundary conditions and saturation of delamination damage has occurred. Validation of DRT is demonstrated in domain outside of these regions. The investigation is further analysed by statistical approach using a three-factorial design of experiments (DoE). The main influence and coupling interaction of stitch density, stitch thread thickness and indentation displacement on indent-induced delamination area are established and discussed. Graphical and statistical results provide further insights and validation to DRT. The novelty of this work lies in showing validation and understanding limitation of DRT for its effective use and accurate prediction of delamination damage in stitched composites.