再生碳纤维摩擦纺纱变形机理的微观力学建模

Tobias Georg Lang, Mmb Hasan, A. Abdkader, C. Cherif, T. Gereke
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引用次数: 0

摘要

随着碳纤维增强聚合物(CFRP)的使用日益增多,从下脚料或报废部件中产生的碳纤维废料也越来越多。将回收的碳纤维(rCF)和热塑性纤维加工成混合纱线,是在具有优异机械性能的结构部件中重复使用废纤维材料的一种可行方法。目前,由 90% 以上的 rCF 组成的摩擦纺纱几乎不含适用于热固性复合材料的热塑性纤维,这种纺纱会导致纤维损坏率高、纱线质量低,因此本项目将解决这一问题。有关该技术的报告见另一篇论文。纺织品悬垂性的限制因素之一是连续纤维的伸展性,而且复杂几何形状的半成品纺织品的悬垂性仍然容易出错。由于纤维之间的滑动机制,摩擦纺纱的纱线伸长率明显更高。摩擦纺纱的变形特性受到纤维间相互作用的显著影响,并取决于各种工艺和材料参数。下文将使用梁元素创建纺纱的微机械有限元模型。蒙特卡洛法用于模拟纱线的局部变化。然后使用这些模型模拟纱线在变形时的行为,并研究各种工艺参数的影响。
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Micromechanical Modelling of the Deformation Mechanisms Friction-Spun Yarn from Recycled Carbon Fibres
The growing use of carbon fibre-reinforced polymers (CFRP) results in an increased amount of CF waste from offcuts or end-of-life components. A promising method to reuse the waste fibre materials in a structural component with excellent mechanical properties is the processing of recycled CF (rCF) and thermoplastic fibres into hybrid yarns. Spinning of friction spun yarns consisting of more than 90% rCF and containing almost no thermoplastic fibres that are suitable for thermoset composites, currently leads to high fibre damage and low yarn quality and is, therefore, addressed in this project. The technology is reported in another paper. One of the limiting factors for drapability of textiles is the stretchability of continuous fibres and draping of the semi-finished textile products for complex geometries is still error-prone. Friction spun yarns exhibit significantly higher yarn elongations due to sliding mechanisms between the fibres. The deformation properties of friction spun yarns are significantly influenced by fibre-fibre interactions and depend on a variety of process and material parameters. In the following, micromechanical finite element models of the spun yarns are created by using beam elements. Monte Carlo method is used to model local variabilities in the yarns. The models are then used to simulate yarn behaviour under deformation and to investigate the influence of various process parameters.
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