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Effect of saw-tooth ply drops on the mechanical performance of tapered composite laminates

机译：锯齿层滴落对锥形复合层压板机械性能的影响

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摘要

Automated Fibre Placement (AFP) is a manufacturing technique to produce large, high quality composite parts, where preimpregnated carbon fibre tapes are laid side-by-side to generate the composite preform. Thickness changes within a component are realised through internal ply terminations, with the tapes being cut perpendicular to the fibre direction. In plies laid up at an angle to the taper direction, the AFP tape cuts create saw-tooth shaped ply drop tips. This increases the size of resin rich zones and enlarges the region where stress concentrations and cracks can develop, which amplifies the risk of failure. This study investigates the effect of simulated AFP saw-tooth ply drop tips, created by hand layup, on the mechanical properties and failure behaviour of carbon fibre/epoxy composites and compares its results to reference broad goods layups. The stiffness was found to be unaffected and the strength was reduced by similar to 10%. The failure mode was governed by delamination for the saw-tooth ply drop tips, whereas the reference specimens failed by rupture of the unidirectional fibres. A finite element modelling technique was used to select the layup to be tested. The models were then refined in the light of experimental results, to accurately predict the failure and explain the failure mode transition.
机译：自动化纤维贴片（AFP）是生产大型高质量复合部件的制造技术，其中预浸渍的碳纤维胶带并排铺设，以产生复合材料预制件。通过内部层终端实现部件内的厚度变化，胶带垂直于光纤方向切割。在朝向锥度的角度下铺设的层，AFP胶带切割产生锯齿状的帘布层尖端。这增加了树脂富有的区域的大小，并扩大了应力浓度和裂缝可以发育的区域，这会放大失败的风险。本研究研究了手动叠层产生的模拟AFP锯齿帘布层滴尖的效果，碳纤维/环氧复合材料的机械性能和失效行为，并将其结果与参考广泛货物汇总进行比较。发现刚度不受影响，并且强度降低了相似的10％。故障模式受锯齿帘布层尖端的分层管辖，而参考标本失败是通过单向纤维破裂的。使用有限元建模技术来选择要进行测试的账户。然后根据实验结果，精确地精制模型，以准确地预测失败并解释失效模式过渡。

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  • 来源
    《Composite Structures》 |2021年第9期|114197.1-114197.10|共10页
  • 作者

    Woigk Wilhelm; Zhang Bing; Jones Mike I; Kuhtz Moritz; Hornig Andreas; Gude Maik; Hallett Stephen R.;

  • 作者单位

    Univ Bristol Bristol Composites Inst Bristol BS8 1TR Avon England|Tech Univ Dresden Inst Lightweight Engn & Polymer Technol ILK Holbeinstr 3 D-01307 Dresden Germany|Swiss Fed Inst Technol Dept Mat Complex Mat Vladimir Prelog Weg 5 CH-8093 Zurich Switzerland;

    Univ Bristol Bristol Composites Inst Bristol BS8 1TR Avon England;

    Univ Bristol Bristol Composites Inst Bristol BS8 1TR Avon England;

    Tech Univ Dresden Inst Lightweight Engn & Polymer Technol ILK Holbeinstr 3 D-01307 Dresden Germany;

    Tech Univ Dresden Inst Lightweight Engn & Polymer Technol ILK Holbeinstr 3 D-01307 Dresden Germany;

    Tech Univ Dresden Inst Lightweight Engn & Polymer Technol ILK Holbeinstr 3 D-01307 Dresden Germany;

    Univ Bristol Bristol Composites Inst 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

    Automated fibre placement; Ply drops; Stress concentrations; Delamination;

    机译：自动化纤维展示位置;潜水;应力浓度;分层;

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