ABSTRACT

The present work explores the tensile, flexural, impact strengths and sound absorption behavior of sisal and palm fiber-reinforced hybrid composites. The sisal and palm fibers were reinforced with epoxy resin through a compression molding technique to fabricate three hybrid composites with different weight ratios. The tensile, flexural, and impact tests were conducted as per ASTM standard for the three hybrid composites. The hybrid composite with 65% epoxy resin, 20% sisal fiber, and 15% palm fiber showed 0.63% high tensile strength, 22.62% high flexural strength, and 36.59% high impact strength compared to the other two hybrid composites. The SEM images of fractography revealed fiber to fracture, surface and fiber pull out, and also its dislocation of tightly packed fiber and matrix stickiness. The sound absorption behavior was accessed as per ASTM standard through an impedance test for the hybrid composites. The composite with 65% epoxy resin,20% sisal fiber, and 15% palm showed a high sound absorption coefficient at the frequency levels of 1600 Hz, 2000 Hz, 2500 Hz, 3150 Hz, and 4000 Hz due to the increased weight ratio of palm fiber. At a frequency level of 4000 Hz, the above hybrid composite showed a maximum sound absorption coefficient difference of 76.61% compared to the other two hybrid composites.

摘要

本工作探讨了剑麻和棕榈纤维增强杂化复合材料的拉伸，挠曲，冲击强度和吸声性能。剑麻和棕榈纤维通过压缩成型技术用环氧树脂增强，以制造三种不同重量比的混合复合材料。根据ASTM标准对三种混合复合材料进行了拉伸，弯曲和冲击测试。与其他两种杂化复合材料相比，具有65％环氧树脂，20％剑麻纤维和15％棕榈纤维的杂化复合材料显示出0.63％的高拉伸强度，22.62％的高弯曲强度和36.59％的高冲击强度。断口的SEM图像显示纤维断裂，表面和纤维拉出，以及紧密堆积的纤维错位和基体粘性。根据杂化复合材料的阻抗测试，按照ASTM标准获得了吸声性能。由于环氧树脂的重量比增加，具有65％环氧树脂，20％剑麻纤维和15％棕榈树的复合材料在1600 Hz，2000 Hz，2500 Hz，3150 Hz和4000 Hz的频率下显示出高吸声系数。棕榈纤维。与其他两种混合复合材料相比，在4000 Hz的频率下，上述混合复合材料的最大吸声系数差异为76.61％。