Mechanical and Sound Absorption Behavior of Sisal and Palm Fiber Reinforced Hybrid Composites

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

研究了剑麻纤维和棕榈纤维混杂复合材料的拉伸、弯曲、冲击和吸声性能. 采用环氧树脂对剑麻纤维和棕榈纤维进行压模增强, 制备了三种不同重量比的混杂复合材料. 按照ASTM标准对三种混杂复合材料进行了拉伸、弯曲和冲击试验. 与其他两种混杂复合材料相比, 65%环氧树脂、20%剑麻纤维和15%棕榈纤维的混杂复合材料具有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. 断口扫描电镜显示纤维断裂, 纤维表面和纤维拔出, 纤维排列紧密, 基体粘滞. 通过对混杂复合材料的阻抗测试, 测试了复合材料的吸声性能. Sixty-fivepercent环氧树脂、20%剑麻纤维、15%棕榈纤维复合材料在1600hz、2000hz、2500hz、3150Hz和4000Hz频率下表现出较高的吸声系数. 在4000hz频率下, 与其它两种杂化复合材料相比, 上述杂化复合材料的最大吸声系数相差76.61%.

KEYWORDS:

• Hybrid composites
• mechanical properties
• sisal and palm fibers
• compression molding
• sound absorption coefficients
• sisal and palm fibers

关键词:

• 混杂复合材料
• 机械性能
• 剑麻和棕榈纤维
• 模压成型
• 吸声系数
• 剑麻和棕榈纤维

Acknowledgments

The authors thank PSG Tech COE Indu Tech, Coimbatore, and LMP R&D Laboratory, Pallipalayam, Erode, Tamilnadu for their technical assistance and for providing the necessary facilities to manufacture and test the natural fibers hybrid composite materials.

Financial Support

The present research work did not receive any financial support from anybody.