Effect of twist level on the mechanical performance of S-glass yarns and non-crimp cross-ply composites
Effect of twist level on the mechanical performance of S-glass yarns and non-crimp cross-ply composites
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DOI：
10.1177/1528083720987206
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发表时间：
2021-01-11
影响因子：
3.2
通讯作者：
Yousaf, Zeshan
中科院分区：
文献类型：
--
作者：
Dalfi, Hussein Kommur;Tausif, Muhammad;Yousaf, Zeshan
高模量/高强度连续纤维由于其优异的特性而广泛用于制造纺织品预成型件，作为复合材料的增强材料。然而，它们的脆性行为和容易分离成单个长丝或束的倾向可能导致在制造过程（例如编织和编织）期间的损坏。因此，开发用于纺织品增强复合材料的最佳纱线的关键步骤是找到最佳捻度，其导致复合层压材料的性能损失最小，同时保持良好的加工性和足够的强度用于纺织品和/或复合材料制造。在这项研究中，捻度水平已被改变，以改善处理和拉伸性能的S-玻璃纱（即拉伸强度）。采用不同水平的纱线捻度（15-40捻米（-1））来研究其对拉伸性能（即拉伸强度、模量、断裂伸长率等）的影响。此外，还研究了捻度对真空浸渍法制备的无卷曲正交铺层复合材料拉伸性能的影响。据观察，加捻纱线的机械性能（即拉伸强度性能）在高达30捻米（-1）时得到改善，而在40捻米（-1）时恶化。在纱线水平，实验结果进行了比较，利用现有的模型加捻纱线性能的理论估计。实验结果与理论计算结果不一致，特别是在高捻度情况下。与使用非加捻纱线制造的复合材料层压板相比，S-玻璃交叉铺层复合材料在所有加捻水平下的拉伸强度和伸长率都更高。在复合水平，实验结果也计算采用混合规则和实验和预测结果之间观察到良好的一致性。
High modulus/high strength continuous fibres are used extensively for manufacturing textile preforms, as a reinforcement, for composites due to their excellent specific properties. However, their brittle behaviour and tendency to separate easily into individual filaments or bundles can lead to damages during manufacturing processes such as weaving and braiding. Thus, the critical step in the development of an optimal yarn for textile-reinforced composites is to find an optimum twist, which results in a minimum loss of properties of the composite laminates, while maintaining good processability and sufficient strength for textile and/or composite manufacturing. In this study, twist level has been varied to improve the handling and tensile properties of S-glass yarns (i.e. tensile strength). Varying levels of yarn twist (15-40 twists metre(-1)) were employed to study its impact on the tensile properties (i.e. tensile strength, modulus, elongation at break etc.). Furthermore, the effect of twist on the tensile properties of non-crimp cross-ply composites produced via vacuum infusion process was studied. It was observed that mechanical performance (i.e. tensile strength properties) of twisted yarns is improved up to 30 twists metre(-1) while it is deteriorated at 40 twists metre(-1). At yarn level, the experimental results were compared with theoretical estimations utilizing existing models for twisted yarns properties. Discrepancies were observed between experimental and theoretical results especially for high level of twist. The tensile strength and elongation of S-glass cross-ply composites at all levels of twist were higher compared to the composite laminates manufactured by using non-twisted yarns. At composite level, the experimental results were also computed employing rule of mixture and good agreement was observed between experimental and predicted results.