Experimental investigation on vibration characteristics and damping factor of coir fiber reinforced polyester composite material K. V. Nikhil, S. Ramasubramanian, Avinash Gudimetla, Gunti Amarnath, G. Sathishkumar, R. Pugazhenthi, Mithilesh K. Dikshit, Vimal Kumar Pathak Discover Applied Sciences, 2025 This research aimed to investigate the composite material composed of polyester with randomly oriented short coir fibers with a length of 10 mm and varying weight percentages from 5 to 20%. The composite material was fabricated by the hand layup method. The tensile strength, flexural strength, hardness, impact strength, free vibration analysis, and damping characteristics were studied; the SEM images were used to analyze the fractured surface of the composite specimens. The current empirical study identified a conspicuous association between the gradual escalation in fiber content for the natural frequency and the damping attributes of the composite material. The test results showed that the composite with 15% coir fibers worked best for several studies examining characteristics over a wide range of temperatures and frequencies. Coir-based composite material yields a natural frequency of 61,862 Hz and a maximum damping ratio (ζ) of 0.29592, indicating enhanced rigidity and vibration absorption capabilities. The damping factor (tan δ) reached a notably low value of 0.360 at a 10 Hz frequency with 15 wt.% fiber content, demonstrating improved energy dissipation. The results show that polyester composites containing 15% wt.% coir fibers have the best mechanical and damping properties, making them a sustainable choice for industrial uses that need to reduce vibrations.
Towards smart materials: Enhancing the efficiency of the materials Avinash Gudimetla, Parveen Kumar, S Sambhu Prasad, Satish Geeri, V. V. N. Sarath Modeling Characterization and Processing of Smart Materials, 2023 This chapter will provide an insight into smart materials, which are a class of materials that can change their physical properties, such as shape, size, stiffness, color, or electrical conductivity, in response to external stimuli, such as temperature, pressure, light, humidity, magnetic, or electric fields. Various types of smart materials like shape memory alloys (SMAs), electroactive polymers (EAPs), piezoelectric materials, magnetostrictive materials, and thermoelectric materials were discussed in this chapter, along with their properties and applications. Nevertheless, the advantages of smart materials over the conventional materials along with the challenges were also discussed. Also, the possibility of integrating these materials with the existing systems was discussed.
Modelling and optimization of wear parameters of al 4032 reinforced with coal ash using taguchi and rsm approach Composites Theory and Practice, 2021
Influence of RHA reinforcements on mechanical and wear behavior of Al 4032 composites Avinash Gudimetla, Surapaneni Sambhu Prasad, Dumpala Lingaraju Emerging Materials Research, 2020 This study was aimed at developing low-cost composites with high specific strength and better performance by incorporating agro-waste as reinforcements. The stir-casting technique was adopted for fabricating composites with aluminum (Al) 4032 as matrix material and 0, 2, 4 and 6 wt.% rice husk ash (RHA) as reinforcements. The mechanical properties of the produced composites were investigated, and the wear rate under dry conditions was also experimented on, to assess the characteristics of the produced composites. Energy-dispersive X-ray spectroscopy and scanning electron microscopy analyses were done to study the presence and distribution of reinforcements in the matrix material. The surface of specimens after wear test was analyzed from optical microscope images. The influence of process parameters such as reinforcement (wt.%), speed (revolutions per min (rpm)) and load (N) on wear rate was identified, and the parameters were optimized for minimum wear rate using a Taguchi L16 orthogonal array. The percentage contribution of process parameters was obtained by performing analysis of variance. Better results were obtained for composites with 6 wt.% RHA with 84 HRB, 92.30 HV, ultimate tensile strength of 383.73 MPa and ultimate compressive strength of 571.6 MPa. Minimum wear rate was obtained for composites with 6 wt.% RHA at 100 rpm and 10 N. Speed was found to be the most contributing factor, with 72.94%, followed by load, with 13.34%, and weight percentage of reinforcements, with 11.88%.
Investigation of mechanical and tribological behavior of al 4032-sihgm mmc Composites Theory and Practice, 2020
