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Short natural fiber–based composites are becoming a viable alternative to short E-glass fiber–reinforced composites in a variety of applications, due to their better damping and sound absorption capabilities. Also, quasi-isotropic properties can be obtained with randomly oriented short natural fibers. However, identifying the optimum fiber length and weight content are important to obtain better mechanical properties. The effect of fiber parameters on acoustic and vibration properties of jute/polyester composites was investigated in this study. Compression molding was used to fabricate composite specimens with different fiber lengths (10, 15, 20, and 25 mm) and fiber loadings (5, 10, 15, and 20 wt%). Further, sound absorption and damping properties of composites were studied using the impedance tube method and a free vibration test in cantilever mode. The damping property increases with increasing fiber loading and decreases with increasing fiber length, according to the findings. The highest natural frequency was found with a fiber length of 5 mm and a fiber loading of 25%, but larger fibers resulted in improved sound absorption. The findings suggest that jute/polyester composites could be a more cost-effective, practical, and environmentally superior and therefore, an alternative to E-glass/polyester composites, particularly in damping-sensitive applications.

Parametric Study of different Fiber Parameters and their Influence on Acoustics and Vibration Behavior of Jute Fiber/Polyester resin Composites