Effect of Raphia vinifera Fibre Size and Reinforcement Ratio on the Physical and Mechanical Properties of an Epoxy Matrix Composite: Micromechanical Modelling and Weibull Analysis

This study evaluates the effects of lengths and reinforcement ratio of Raphia vinifera fibres (RVFs) on the physical and mechanical properties of an epoxy matrix composite. Three volume fractions (20%, 30%, and 40%) and three lengths (5, 10, and 15 mm) of fibres were used to produce the composite, and the samples were subjected to the absolute and apparent density, porosity, water absorption rate, and tensile and flexural strength. The probability of failure of the composite is described by the means of two-factor Weibull model. In addition, a theoretical approach to predict mechanical characteristics based on empirical models was carried out. The results show that the addition of RVF decreases the density of the composite, while the porosity and absorption rate increase. The mechanical test shows that the tensile and flexural stress and Young's modulus of the composite are lowered compared to those of the resin alone. Multivariate analysis of variance (MANOVA) and Tukey test showed that fibre lengths and reinforcement ratio significantly lower the mechanical properties of the composite. The distribution of strength and Young's modulus follows Weibull's law. Furthermore, the Cox-Krenkel mathematical model has the best approximated model for the experimental results after the tensile test. Based on these results, this material could be used as reinforcement parts for vehicle backrests or interior decoration in the construction industry.

Automated summary

This study investigates the effects of length and reinforcement ratio of Raphia vinifera fibres (RVFs) on the physical and mechanical properties of an epoxy matrix composite. Various volume fractions and lengths of fibres were used to produce the composite, and the samples were tested for density, porosity, water absorption rate, tensile and flexural strength. The study found that the addition of RVF decreased the density of the composite and increased porosity and absorption rate, while also lowering mechanical properties such as tensile and flexural stress and Young's modulus. Fibre lengths and reinforcement ratio significantly affected the mechanical properties of the composite. The distribution of strength and Young's modulus followed Weibull's law. The Cox-Krenkel mathematical model was found to be the best approximation for the experimental results. These findings suggest that RVFs could be used as reinforcement parts in various applications.