Complex shape forming of a flax woven fabric; analysis of the tow buckling and misalignment defect
Complex shape forming of a flax woven fabric; analysis of the tow buckling and misalignment defect
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DOI：
10.1016/j.compositesa.2013.03.017
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发表时间：
2013-08-01
影响因子：
8.7
通讯作者：
Gueret, S.
中科院分区：
文献类型：
--
作者：
Ouagne, P.;Soulat, D.;Gueret, S.
为了最大限度地减少对环境的影响，并生产出具有良好生产率/成本比的结构部件，本研究对亚麻基机织物的片材成型进行了研究。一种亚麻纤维平纹织物被用来形成复杂的四面体形状。这种形状特别有趣，因为它包含许多汽车零件所需的几个几何奇点，例如双曲率或三曲率和低曲率边缘。整体上，得到了复杂的四面体形状，但在形状的特定区域观察到拖带屈曲（拖带的面外弯曲）。这个缺陷起源的主要机制已经被定义。通过增加膜张力来减小拖扣尺寸。论证并讨论了织物结构在细观和宏观尺度上对双扣外观的影响。成功地提出了基于纤维束或织物尺度的织物结构设计来防止这种缺陷出现的解决方案。因此，当考虑复杂形状的板材成形时，应选择特定的织物结构来防止屈曲缺陷的出现。(C) 2013 Elsevier Ltd.版权所有。
With the view to minimise the impact on the environment and to produce structural parts with a good production-rate/cost-ratio, the sheet forming of woven flax based fabric was investigated in this study. A flax fibre plain-weave fabric has been used to form a complex tetrahedron shape. This shape is of particular interest as it contains several geometric singularities required by many automotive parts such as double or triple curvature and low-curvature edges. Globally, the complex tetrahedron shape was obtained, but tow buckling (out of plane bending of tows) was observed in specific zones of the shape. The main mechanism at the origin of this defect has been defined. A reduction of the tow buckle size was obtained by increasing the membrane tension. The influence of fabric architecture at the mesoscopic and macroscopic scales on the appearance of the tow buckles was demonstrated and discussed. Solutions to prevent the appearance of this defect based on the design of the fabric architecture at the tow or fabric scales were successfully proposed. As a consequence, when sheet forming of complex shapes is considered, specific fabric architectures should be chosen to prevent the appearance of the buckling defect. (C) 2013 Elsevier Ltd. All rights reserved.