几种碳纤维结构对垂降效果的影响

Yuri Pereira Chuves, M. Pitanga, Inga Grether, M. Cioffi, F. Monticeli
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引用次数: 1

摘要

航空领域的发展导致聚合物复合材料应用的增长,对复杂尺寸和形状的部件应用产生了新的需求。将二维织物悬垂成三维形式的不同方法,由于悬垂后会改变纤维的取向,因此关注的是保持织物的性能和特性。为此,本研究旨在评估二维干纤维织物(平纹、斜纹、缎纹、无卷曲织物0/90和±45)成复杂几何形状(即球形缩进)的垂降能力。悬垂织物所需的能量由织物变形机制(剪切和弯曲)组成,这些机制与微观变形分析一起用于确定具有最高延展性的合适织物结构。由于缝线的折叠作用,两种NCF织物表面都具有高能量和粗糙度。另一方面,平纹和斜纹织物所需的悬垂能量较低,但表现出较高的纤维错位和变形。缎面经纬关系有利于剪切和弯曲机制,具有较好的载荷分布均匀性、悬垂性对称性、较低的变形程度和较低的纤维错位。尽管悬垂需要中间载荷和能量,方差分析和优化方法证实,缎面织物在复杂几何应用中表现出更好的延展性行为。
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The Influence of Several Carbon Fiber Architecture on the Drapability Effect
The growth of the aeronautical sector leads to the growth of polymer composites application, creating new demand for components applications in complex dimensions and shapes. Regarding different methods of draping 2D fabric into a 3D format, the concern is to keep the fabric properties and characteristics, since fiber orientation is modified after draping. For that purpose, this study aims to evaluate the drapability capacity of 2D dry fibrous fabrics (plain, twill, satin, non-crimp-fabric 0/90, and ±45) into a complex geometry, i.e., spherical indent. The energy required to drape fabric is composed of fabric deformation mechanisms (shear and bending), which were used together with microscopic deformation analysis to determine the appropriate fabric architectures with the highest malleability. Both NCF fabrics presented high energy and roughness on the fabric surface due to the folding effect of stitching. On the other hand, plain and twill weave fabrics required lower energy to drape but demonstrated higher fiber misalignment and deformation. The satin warp/weft relation favored shear and bending mechanisms, presenting better uniformity in load distribution, symmetry on drape capability, lower deformation degree, and lower fiber misalignment. Despite the intermediate load and energy required for drape, ANOVA and optimization methods confirmed that satin fabric showed better malleability behavior for complex geometries applications.
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