The present study concentrates on a series of experiments and numerical analyses for understanding the effects of fiber volume fraction (VF) and draw ratio (DR) on the effective elastic properties of unidirectional composites made from an epoxy resin matrix with a continuous fiber reinforcement. Lyocell-type regenerated cellulose filaments (Ioncell) spun with DRs of 3, 6, and 9 were used. In accordance with the specimens in situ, the fibers were modeled as slender solid elements, for which the ratio between the diameter and length was taken to be much less than unity and deposited inside the matrix with the random sequential adsorption algorithm. The embedded element method was thereafter used in the numerical framework due to its computational advantages and reasonable predictions for continuous fiber reinforced composites. Experiments and numerical investigations were carried out, the results of which were compared, and positive trends for both fiber VFs and DRs on the effective properties were observed. The presented experimental and numerical results and models herein are believed to advance the state of the art in the mechanical characterization of composites with continuous fiber reinforcement.

本研究集中在一系列实验和数值分析上，以了解纤维体积分数（VF）和拉伸比（DR）对具有连续纤维增强的环氧树脂基质制成的单向复合材料的有效弹性性能的影响。使用以3、6和9的DR纺丝的莱赛尔（Lyocell）型再生纤维素丝（Ioncell）。按照原位标本，将纤维建模为细长的固体元素，对于这些元素，直径和长度之间的比率被认为远小于1，并通过随机顺序吸附算法沉积在基质内部。此后，由于其计算优势和对连续纤维增强复合材料的合理预测，因此在数值框架中使用了嵌入式元素方法。进行了实验和数值研究，比较了结果，并观察了纤维VF和DR对其有效性能的积极趋势。据信本文所提供的实验和数值结果及模型在具有连续纤维增强的复合材料的机械表征方面促进了现有技术水平。