Faculty Publications

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    Mechanical Properties and Characterization of Hybrid Composition Reinforced with Natural Fibers
    (Springer, 2024) Dayanand; Bheemanalli, A.; Sangamesh; Gurumurthy, B.M.; Ravishankar, K.S.
    The current work involves fabrication of hybrid composite by using sisal and roselle natural fibers as reinforcing elements or fillers with epoxy resin (LAPOX L12) and Hardener or catalyst (K6) by hand lay-up method with a 35:75 ratio. Enhancement of mechanical properties in polymer hybrid composites is exhibited by the possible intermixture of roselle and sisal fibers [1]. The effect of loose and continuous fiber (CLFR) and woven mat fiber-reinforced (WMFR) hybrid composite laminates were tested to evaluate the mechanical and physical performance exhibited by them. Water absorption test along with thickness swelling test was carried out and the data was recorded for reference. The tensile strength and modulus of WMFR composite (dry) are reduced by 35% and 17%, respectively, and compressive strength and modulus of WMFR composite (dry) are reduced by 17% and 33%, respectively. It was also noticed that Erosion rate of the samples increases as the increase of sand particle size, sand concentration, and erosion rate is high in case CLFR (4.93%) composite. Water absorption is high in CLFR than in WMFR composite. SEM analysis revealed that fiber pull-out, de-bonding, matrix softening, fiber rupture, sliding tracks, debris, and cracks were the reasons for the failure of composites. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    A detailed study on hybrid plant fibers for packaging applications
    (2012) Saravana Bavan, D.; Mohan Kumar, G.C.
    Natural fibers are the most economic and usable fibers in upcoming generation of composite industries. They are valid in several applications of automotive sectors, structural field, and packaging industries. The present work is focussed on processing a hybrid plant fiber of vetiver and maize that can be used for packaging industries. The hybrid fiber is processed through Vacuum Assisted Resin Transfer Molding (VARTM) method. The obtained fiber is a biocomposite material of plant fiber and bio resin of epoxodized soya bean oil. The material is tested for mechanical, thermal and morphology properties and it can be summarized that these novel hybrid fibers are good looking and have appreciable properties that can be used for packaging applications. These materials are green and less harm to environment compared to synthetic fibers.
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    Significant aspects on thermal degradation of hybrid biocomposite material
    (2013) Saravana Bavan, B.D.; Mohan Kumar, G.C.
    Interest in use of bio fibers is increasing rapidly in structural and automotive applications because of few important properties such as low density, mechanical properties, renewability, biodegradation and sustainability. The present work is focused on fabricating a hybrid bio-composite material processed through compression molding technique. Natural fibers of maize and jute with bio polymeric resin of epoxidized soya bean oil are used as a matrix in obtaining a hybrid bio composite material. Thermal degradation of the prepared material is studied through Thermal gravimetric analyzer. Chemical treatment of the fibers was performed to have a better adhesion between the fibers and the matrix. The work is also surveyed on various parameters influencing the thermal properties and other aspects for a hybrid bio composite material. © 2013 AIP Publishing LLC.
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    Thermal properties of maize fiber reinforced unsaturated polyester resin composites
    (2013) Saravana Bavan, B.D.; Mohan, K.G.C.
    Increase in demand for natural fiber composites are raising today because of more advantage when compared to traditional fiber composites. In the present work, natural fiber composite material is processed by vacuum assisted resin transfer molding technique and the fibers are maize stalk fibers with matrix of unsaturated polyester resin. With suitable catalyst and accelerator composite material is fabricated and thermal properties for the material is examined by thermal gravimetric analyzer, differential scanning calorimeter and the results are also compared with finite element method.
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    Investigation on Hybrid Polyester Composite Comprising of Sisal and Coir as a Reinforcement and Fly Ash as Filler
    (Springer Science and Business Media Deutschland GmbH, 2021) Darshan, M.L.; Biradar, S.; Ravishankar, K.S.
    The use of lignocellulosic fibers such as coir and sisal as reinforcements in thermoplastic and thermosetting resins for developing new material having property superior than the existing one. These biofibers have several advantages, such as good strength, flexibility, low densities, low cost, and biodegradability; over synthetic fibers, these natural fibers are made hydrophobic by 8% NaOH treatment. Alkali treatment increases wettability of fibers with resin and interfacial bond strength. This paper is highlighting about the preparation of hybrid composite and testing the prepared samples for various mechanical and tribological tests such as tensile, flexural, and slurry erosion tests conducted for coir/sisal-hybrid fibers with fly ash as a filler in unsaturated polyester resin. The obtained results are further justified by the SEM images of tested samples from different mechanical tests. This material has been used for automobile application and packing material, roofing material in construction technology. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    A comprehensive review on material selection for polymer matrix composites subjected to impact load
    (China Ordnance Industry Corporation, 2021) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    Polymer matrix composites (PMC) are extensively been used in many engineering applications. Various natural fibers have emerged as potential replacements to synthetic fibers as reinforcing materials composites owing to their fairly better mechanical properties, low cost, environment friendliness and biodegradability. Selection of appropriate constituents of composites for a particular application is a tedious task for a designer/engineer. Impact loading has emerged as the serious threat for the composites used in structural or secondary structural application and demands the usage of appropriate fiber and matrix combination to enhance the energy absorption and mitigate the failure. The objective of the present review is to explore the composite with various fiber and matrix combination used for impact applications, identify the gap in the literature and suggest the potential naturally available fiber and matrix combination of composites for future work in the field of impact loading. The novelty of the present study lies in exploring the combination of naturally available fiber and matrix combination which can help in better energy absorption and mitigate the failure when subjected to impact loading. In addition, the application of multi attributes decision making (MADM) tools is demonstrated for selection of fiber and matrix materials which can serve as a benchmark study for the researchers in future. © 2020 The Authors
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    Potential use of natural fiber composite materials in India
    (2010) Saravana Bavan, D.; Mohan Kumar, G.C.M.
    This study focuses on the potential use of natural fibers in composite materials, their availability, processing features, mechanical and physical properties, and some of their applications in India. © 2010 The Author(s).
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    Dynamic mechanical analysis and free vibration behavior of intra-ply woven natural fiber hybrid polymer composite
    (SAGE Publications Ltd info@sagepub.co.uk, 2016) RAJESH, M.; Jeyaraj, P.
    Influence of nature of weaving pattern and intra-ply hybridization of natural fibers on dynamic mechanical and free vibration characteristics of woven banana/jute polyester composite has been investigated. Results revealed that basket-type composite has better dynamic properties due to uniform stress distribution in both warp and weft directions. Warp jute fiber and weft banana fiber (WJWB) and both warp and weft banana and jute fiber (WAWBJ) intra-ply hybrid composites have better dynamic mechanical behavior as relatively stronger fiber is oriented along the loading direction. Experimental modal analysis carried out on beam-like samples revealed that warp and weft banana and jute fiber intra-ply hybrid composite has better natural frequencies while huckaback woven and warp banana fiber and weft jute fiber composites have better modal damping factors. © The Author(s) 2015.
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    Mechanical Properties of Natural Fiber Braided Yarn Woven Composite: Comparison with Conventional Yarn Woven Composite
    (Science Press bcanji@mail.sioc.ac.cn, 2017) RAJESH, M.; Jeyaraj, J.
    The effect of reinforcing natural fiber in the form of braided yarn woven fabric on mechanical properties of polymer composite was investigated. The results of braided yarn fabric composites were compared with the conventional yarn fabric composite and random oriented intimately mixed short fiber composites for the same percentage of fiber weight. The effect of intra-ply hybridization, by keeping two different natural fiber yarns along two different directions of a woven fabric, on mechanical properties of the woven fabric composite was also analyzed. Natural fiber braided yarn fabric reinforcement significantly increased the mechanical properties of the composites compared with that of the conventional woven fabric and short fiber reinforcements. Intra-ply hybridization of two different natural fibers improved the mechanical properties of the conventional woven fabric composite while it could not enhance the properties of the braided fabric composite. The improvement in impact property is very high compared to tensile and flexural properties due to the braided yarn fabric reinforcement. © 2017 Jilin University
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    Experimental investigation on buckling and free vibration behavior of woven natural fiber fabric composite under axial compression
    (Elsevier Ltd, 2017) RAJESH, M.; Jeyaraj, J.
    Influence of axial compression load on buckling and free vibration characteristics of natural fiber fabric polymer composite beam is analyzed experimentally. Critical buckling strength, free vibration frequencies and modal loss factors are obtained and analyzed. It is found that buckling strength increases with number of layers of fabric in composite. It is also observed that weaving pattern of the fabric influences buckling strength of the composite and basket type woven fabric enhances the buckling strength compared to plain and herringbone woven fabric composites. Sandwich composites with glass fiber fabric facing layer and natural fiber fabric as core layer having higher buckling strength. Free vibration frequency reduces with increase in axial compression load while modal damping factor increases in the pre-buckling region. However, this behavior reverses in the post-buckling region. The load-deflection obtained experimentally is compared with finite element result obtained considering the geometric non-linearity. © 2016 Elsevier Ltd