Jute and Luffa Fiber-Reinforced Biocomposites: Effects of Sample Thickness and Fiber/Resin Ratio on Sound Absorption and Transmission Loss Performance

ABSTRACT

The acoustic properties of natural fiber-reinforced composites should be identified before using these materials in various engineering applications including sound and vibration isolation. This study investigates the effects of sample thickness and fiber/resin ratio on the acoustic performance of jute and luffa fiber-reinforced biocomposites. For this purpose, jute and luffa composite samples with different thicknesses and fiber/epoxy ratios are manufactured and their sound absorption coefficients (SACs) and transmission losses (TLs) are determined using impedance tube method. Thickness-dependent tendencies of the SACs and TLs of jute and luffa composites for low-, medium-, and high-frequency ranges are identified. The effect of fiber/epoxy ratio on the acoustic properties of jute and luffa composites as a function of frequency are determined. Furthermore, the SACs and TLs of some natural fiber-based samples with different thicknesses are predicted using mathematical models and the theoretical and experimental results are compared and evaluated.

摘要

在将天然纤维增强复合材料用于各种工程应用（包括隔声和隔振）之前，应确定其声学特性. 研究了样品厚度和纤维树脂比对黄麻和丝瓜纤维增强生物复合材料声学性能的影响. 为此，制备了不同厚度和纤维/环氧树脂比的黄麻和丝瓜复合材料样品，并用阻抗管法测定了它们的吸声系数（SACs）和传输损耗（TLs）. 确定了黄麻和丝瓜复合材料在低频、中频和高频范围的SACs和TLs随厚度的变化趋势. 研究了纤维/环氧树脂比对黄麻和丝瓜复合材料声学性能的影响. 利用数学模型预测了不同厚度天然纤维样品的SACs和TLs，并对理论和实验结果进行了比较和评价.

KEYWORDS:

• Jute
• luffa
• biocomposites
• fiber/resin ratio
• sound absorption
• transmission loss

关键词:

• 黄麻丝瓜
• 生物复合材料
• 纤维/树脂比
• 吸声
• 传输损耗

Acknowledgments

This work was supported by TUBITAK (The Scientific and Technological Research Council of Turkey) under Grant 119M115. The authors thank Mr. Yusuf Saygili (PhD student) from Istanbul Technical University for his support during the initial impedance tube experiments.