OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 3 2023 Analysis of mechanical behavior and free vibration characteristics of treated Saccharum munja fiber polymer composite Savendra Singh a, *, Chetan Hirwani b Department of Mechanical Engineering, National Institute of Technology Patna, Patna, Bihar, 800005, India a https://orcid.org/0000-0002-5151-0284, savendrasingh123@gmail.com, b https://orcid.org/0000-0003-4291-4575, hirwani.ck22@gmail.com Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2023 vol. 25 no. 3 pp. 117–125 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.3-117-125 ART I CLE I NFO Article history: Received: 24 May 2023 Revised: 06 June 2023 Accepted: 13 June 2023 Available online: 15 September 2023 Keywords: Saccharum munja Compression moulding machine Natural frequency Damping Tensile test ANOVA Acknowledgements Authors are very thankful to Rajkiya Engineering College, Azamgarh for providing laboratory for research work. ABSTRACT Introduction. With increasing environmental concern nowadays, researchers are studying new alternating materials that can meet the society needs and are extracted from renewable and biodegradable resources. The various natural fibers have been investigated by researchers to replace synthetic ones. The purpose of the work. In present study, treated saccharum munja fibers considered as reinforcement material in Particulate (PC), Short and Random (SRC) and in Unidirectional (UDC) form along with AW106 Resin and HV953. The paper assesses the mechanical properties of Munya fibers (Saccharum munja). Initial six natural frequencies along with corresponding damping factors are measured to analyze the possibility of using a composite material. Research methods. A compression molding machine was used to form laminated composite materials. Surface treatment of fibers removes the dust, lignin and hemicellulose, which improves mechanical and free vibration properties. Results and Discussion. Tensile and flexural test shows the highest value of strength 170 MPa and 143 MPa in case of UDC composite, and the lowest in the case of PC. Addition of munja fiber to epoxy matrix enhances the fiber matrix adhesion bonding. The PC composite shows better value of damping than SRC and UDC composite. The highest natural frequency 43, 233, 298, 849, 918 and 1,440 Hz obtained in case of UDC irrespective of all modes. The results of the free vibration analysis show that Saccharum Munja fiber composite may be used as structural material. Analysis of variance (ANOVA) shows that the experimental results output in case of tensile and flexural teste are significant. For citation: Singh S.P., Hirwani C.K. Analysis of mechanical behavior and free vibration characteristics of treated Saccharum munja fiber polymer composite. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 3, pp. 117–125. DOI: 10.17212/1994-6309-2023-25.3-117-125. (In Russian). ______ * Corresponding author Singh Savendra Pratap, Assistant professor Department of Mechanical Engineering National Institute of Technology Patna, 800005, Patna, Bihar, India Tel.: +91-9455446960, e-mail: savendrasingh123@gmail.com Introduction In recent years, natural fiber has become a viable alternative material. Natural fibers are useful materials and are able to replace the synthetic ones [1]. Recent studies show that natural fibers can replace even glass fiber [2]. Due to natural fibers modern materials are created that can replace existing synthetic fibers. Because of the intensifying energy crisis and increased environmental awareness, much attention is paid to natural fibers and various composites based on it [3]. Saccharum munja grass fiber extraction and use in composite materials [4]. Many studies have been carried out on polymer composite materials based on natural fibers due to its good mechanical properties. In the last 20 years, there has been a great interest in the use of agricultural products that are cellulosic and lignocellulosic for the use of composite applications, particularly for matrix reinforcement [5]. Unlike synthetic fibers such as Kevlar, nylon, polyester, rayon,
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