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首页> 外文期刊>Composite Structures >Delamination migration in multidirectional composite laminates under mode I quasi-static and fatigue loading
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Delamination migration in multidirectional composite laminates under mode I quasi-static and fatigue loading

机译：准静态和疲劳载荷下多向复合材料层合板的层间迁移

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摘要

Delamination migration is particularly critical in multi-directional composite laminates and is often observed in different loading scenarios and components. Further understanding on the migration mechanism, especially the similarities and differences in the quasi-static and fatigue delamination migrations, is important for the design of composite structures. In this study, the process of delamination migration under mode I quasi-static and fatigue loadings was experimentally investigated for specimens with a + theta/- theta centreline interface. Specimens, with a specially designed stacking sequence, which allows migration events using a simple Double Cantilever Beam setup, were tested for theta = 75 degrees and 60 degrees. Delamination migration via intralaminar ply splitting has been observed and this was confirmed by the X-ray computed tomography scan results. All the specimens from both quasi-static and fatigue loadings had a fairly similar sequence of damage events; delamination grows through the - theta and + theta ply block successively until it reaches the 0 degrees ply that prevents further migration. The delamination paths and shape of fracture surfaces were observed to be the same, while the Scanning Electron Microscope fractography results showed that the quasi-static fracture surface was rougher in comparison with that of fatigued specimens. In addition, the distances of migration points from the pre-crack tip were slightly smaller in the fatigue specimens, which may indicate a greater propensity for migration under fatigue loading. This study provides important guidelines to the damage tolerance design of multidirectional composite structures and the verification of advanced numerical modelling technologies.
机译：分层迁移在多向复合材料层压板中尤为重要，并且经常在不同的加载场景和组件中观察到。进一步了解迁移机制，尤其是准静态和疲劳分层迁移的异同，对于复合结构的设计很重要。在这项研究中，通过实验研究了具有+ theta /-theta中心线界面的样品在I型准静态和疲劳载荷下的分层迁移过程。标本具有特殊设计的堆叠顺序，可以使用简单的双悬臂梁设置进行迁移事件，并针对θ= 75度和60度进行了测试。已经观察到通过层内层片分裂的分层迁移，这已通过X射线计算机断层扫描结果得到了证实。所有来自准静态和疲劳载荷的试样都有相当相似的损伤事件序列。分层依次通过-theta和+ theta层增长，直到达到0度层为止，以防止进一步迁移。观察到断裂路径和断裂表面的形状是相同的，而扫描电子显微镜的断口结果表明，与疲劳试样相比，准静态断裂表面更粗糙。此外，在疲劳试样中，距裂纹前尖端的迁移点距离略小，这可能表明在疲劳载荷下迁移的倾向更大。该研究为多向复合结构的损伤容限设计和先进数值建模技术的验证提供了重要的指导。

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  • 来源
    《Composite Structures》 |2018年第4期|160-176|共17页
  • 作者

    Gong Yu; Zhang Bing; Hallett Stephen R.;

  • 作者单位

    Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China;

    Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg,Univ Walk, Bristol BS8 1TR, Avon, England;

    Univ Bristol, Bristol Composites Inst ACCIS, Queens Bldg,Univ Walk, Bristol BS8 1TR, Avon, England;

  • 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

    Carbon fibre; Delamination; Transverse cracking; Mechanical testing;

    机译：碳纤维;分层;横向裂纹;机械测试;

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