ABSTRACT

The virtues of hybrid composites are higher performances and improved mechanical properties as compared to polymer composites. Hence, it have been extensively used in various applications. However, only a few works reported on the performance of natural fiber-reinforced biocomposite. In this study, the experimental work has been carried out to investigate the mechanical properties, such as tensile, flexural and impact, of randomly oriented Calotropis gigantea Fiber (CGFs) & Palmyra fiber (PFs)-reinforced Phenol-Formaldehyde (PF) hybrid biocomposites. The samples have been prepared by varying the fiber percentages and fiber length by using hand layup method. The fabricated specimens were tested as per ASTM standard. The results illustrate that the addition of palmyra fiber with Calotropis gigantea fiber composites improved the mechanical properties of hybrid composite. Hybridization of Calotropis gigantea Fiber (CGFs) & Palmyra fiber (PFs) was effective at higher fiber volume percentage composites. Variation in fiber length shows effective results in mechanical properties. The water absorption of the composites increased with the increase in the fiber volume percentage, all the composites attained equilibrium state after 120 hours. To understand the failure mechanism of composites during mechanical testing, the failed specimens were examined using Scanning Electron Microscopic (SEM) images. Also, the failure modes and their effects were discussed.

摘要

与聚合物复合材料相比，混合复合材料的优点是具有更高的性能和改进的机械性能。因此，它已被广泛用于各种应用。然而，只有少数作品报道了天然纤维增强生物复合材料的性能。在这项研究中，已经进行了实验工作，以研究随机取向的牛角豆纤维（ CGFs）和棕榈纤维（PFs）增强的酚醛（PF）杂化生物复合材料的力学性能，如拉伸、弯曲和冲击。. 通过使用手糊法改变纤维百分比和纤维长度来制备样品。根据 ASTM 标准对制造的样品进行测试。结果表明，在大角豆属植物中添加棕榈纤维纤维复合材料改善了混合复合材料的力学性能。Calotropis gigantea纤维 (CGFs) 和 Palmyra 纤维 (PFs) 的杂交在较高纤维体积百分比的复合材料中是有效的。纤维长度的变化显示出机械性能的有效结果。复合材料的吸水率随着纤维体积百分比的增加而增加，所有复合材料在120 h后均达到平衡状态。为了了解复合材料在机械测试过程中的失效机制，使用扫描电子显微镜 (SEM) 图像检查了失效试样。此外，还讨论了故障模式及其影响。