Madueke Chioma Ifeyinwa, Mbah Oguejiofor Miracle, Umunakwe Reginald
Department of Materials and Metallurgical Engineering, Faculty of Engineering, Federal University Oye-Ekiti, Oye, 371104 Ekiti Nigeria.
Department of Mechanical Engineering, Faculty of Engineering, Federal University Oye-Ekiti, Oye, 371104 Ekiti Nigeria.
Polym Bull (Berl). 2023;80(4):3489-3506. doi: 10.1007/s00289-022-04241-y. Epub 2022 May 7.
Natural fibres such as coir, jute, flax, and hemp have been considered for technical applications. These fibres, though with some desirable qualities such as low density and environmental compatibility, possess the common property of non-uniformity along their length and, as a result, variable diameter and variable cross-sectional area. Several other factors, such as gauge length, fibre species and origin, strain rate, method of extraction of the fibres, porosity and pore size distribution, have been identified to influence the tensile strength of natural fibres and limit their applications in composites. Besides, several authors have used different diameters for the same type of natural fibre, such as coir, resulting in significant inconsistency in the tensile properties. For the same type of coir fibre, and from tensile strength reports from ten authors, an average tensile strength of 120.97 ± 42.30 MPa was obtained. The average number of fibres used in most cases for the tensile test was less than the requirement for natural fibres. All these factors were addressed with the aim of improving the overall properties of natural fibres and their composites.
诸如椰壳纤维、黄麻、亚麻和大麻等天然纤维已被考虑用于技术应用。这些纤维虽然具有一些理想的特性，如低密度和环境相容性，但在其长度方向上具有不均匀性这一共同特性，因此直径和横截面积也会变化。已确定其他几个因素，如标距长度、纤维种类和来源、应变速率、纤维提取方法、孔隙率和孔径分布，会影响天然纤维的拉伸强度并限制其在复合材料中的应用。此外，几位作者对同一类型的天然纤维（如椰壳纤维）使用了不同的直径，导致拉伸性能存在显著不一致。对于同一类型的椰壳纤维，根据十位作者的拉伸强度报告，得到的平均拉伸强度为120.97±42.30兆帕。在大多数拉伸试验中使用的纤维平均数量低于天然纤维的要求。所有这些因素都得到了解决，目的是改善天然纤维及其复合材料的整体性能。
