Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science

INFLUENCE OF FIBER LENGTH AND MOISTURE CONTENT ON SOUND AND VIBRATION CHARACTERISTICS OF HEMP/EPOXY COMPOSITES


DOI: 10.5937/jaes0-44872 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 21 article 1136 pages: 957-962

Raman Singh
Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India

Sandesh Nayak
Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India

Sriharsha Hegde*
Vibration and Acoustic Lab, Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India

Padmaraj NH*
Advanced Composite Lab, Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India

Bio-composites have become increasingly popular as a substitute for synthetic fibers over the last decade due to their eco-friendly nature. To utilize them effectively in engineering applications, particularly in the automotive industry, a thorough understanding of the material properties is necessary. This experimental investigation focuses on exploring the vibration-damping and acoustic properties of fiber composites made from hemp natural fiber and epoxy resin. The study involved the preparation of composite specimens using both short and long fibers through a hand layup process. The natural frequency and damping ratio of the specimen were computed from time-domain experimental data. The sound absorption coefficient of fiber specimens was determined in the frequency range of 63 Hz to 6300 Hz by using the impedance tube technique. The analysis revealed that the pre-treatment of fiber and the use of long fiber rather than short fiber enhances the damping properties of hemp fiber composites. Immersion of specimens in water resulted in the degradation of damping properties. Acoustic tests clearly showed that the ageing process affected short-treated fiber composites more significantly when compared to long-treated fiber composites.

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The authors thank the Department of Aeronautical and Automobile Engineering and, Manipal Institute of Tech-nology, Manipal Academy, Manipal for providing the high computational facility to carry out this research.

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