Faculty Publications
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Item Experimental study on Abrasive wear behaviour of flexible green composite intended to be used as Protective Cladding for Structures(ModTech Publishing House office@hotelfloramamaia.ro, 2019) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.In the present study, the influence of material and process parameters on the two body abrasive wear behavior of Jute-Rubber flexible composite is investigated using Taguchi’s design of experiments (DOE). Three different stacking sequences of composite namely jute-rubber-jute (JRJ), jute-rubber-rubber-jute (JRRJ) and jute-rubber-jute-rubber-jute (JRJRJ) are considered and their wear behavior is evaluated using two body abrasion test with multi-pass condition for abrading distances of 0.4 m to 1.2 m in increments of 0.4 m and varied load of 9.81 N, 12.26 N and 14.71 N. Abrasive volume loss and specific wear rate as function of abrading distance are determined. The results from Taguchi’s design of experiments show that for two body dry sliding wear situation, an abrading distance significantly affects the specific wear rate compared to load and composite configuration. However, volume loss is more and appreciable when jute fabric is exposed to abrasive medium rather than when the rubber is exposed. Surface morphology study is carried out using a scanning electron microscope to get an insight of wear mechanism of constituents of the flexible composite. Stretching of asperities results in wear of the rubber, whereas fiber breakage causes wear of the jute. Rubber being the dominating constituent of flexible composite results in providing better wear resistant properties and thus can act as a potential candidate for sacrificial structures to protect primary structures subjected to wear. © International Journal of Modern Manufacturing Technologies.Item Three body abrasive wear assessment of novel jute/natural rubber flexible green composite(SAGE Publications Ltd, 2021) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.Determining the resistance to abrasion of the flexible cladding for armours and automobile structural components with the aid of lab scale tests has become increasingly important. In the present study, three body wear behaviour of flexible green composites comprising of jute in woven fabric form with interleaved natural rubber sheets bonded through rubberized B stage cured Pre pegs have been studied. Flexible composites are fabricated in three different configurations having different layers of jute and rubber. The present study makes use of silica sand as the abrasive medium. The specific wear rate along with loss in mass and volume of the composite due to wear is determined and it was found that specific wear rate is dependant of the sliding distance. Comparing the specific wear rate of all the three stacking sequences, it was found that JRJ stacking sequence provides better wear resistance. Compliant and tough nature of the rubber makes it hard to wear it out through tearing action and also the wear resistance of flexible composites is enhanced with inclusion of rubber. Mechanism of wear in each of the constituent used is studied. The present study serves as a benchmark work for the future research in this area. © The Author(s) 2021.Item Experimental study on two-body and three-body abrasive wear behaviour of jute-natural rubber flexible green composite(SAGE Publications Ltd, 2023) Mahesh, V.; Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.The use of laboratory testing has become more significant to assess abrasion resistance in flexible reinforcement of armour and car structural components. In this study, compliant composite with constituents as woven jute fabric and natural rubber encapsulated in an NR-based B stage cured prepreg were tested for wear due to abrasion under two- and three-body conditions. Flexible composites are fabricated in three different configurations namely Jute/Rubber/Jute, Jute/Rubber/Rubber/Jute and Jute/Rubber/Jute/Rubber/Jute. The present study makes use of abrasive paper with a grit size of 60 and silica sand with size 250 μm as the abrasive medium for two- and three-body abrasion tests, respectively, and the specific rate of wear is calculated. Though the wear trend of the composites follows a similar pattern in the case of two- and three-body wear, the mechanisms governing the wear are found to be different. The morphology of the worn surface is studied with the aid of a scanning electron microscope. © The Author(s) 2022.Item Load- and time-dependent three-body abrasive wear in short carbon fiber- and cenosphere-reinforced polymer composites using machine learning approach(Springer Science and Business Media Deutschland GmbH, 2025) Mahesh, V.; Mahesh, V.; Joladarashi, S.; Madhu, N.; Manoj, T.U.; Meghana, D.; Sinchana, K.V.This study investigates the load and time-dependent three-body abrasive wear behavior and surface morphology of polymer composites reinforced with varying proportions of short carbon fiber (Cr) and cenosphere (C) inclusions. Composites with different Cr and C reinforcements—Cr0C0, Cr0C20, Cr20C0, Cr15C5, Cr10C10 and Cr5C15—were subjected to wear tests under loads of 20, 30, and 40 N over exposure times of 5, 10, and 15 min. Mass loss and specific wear rate were evaluated to understand the influence of reinforcement composition and test parameters on wear performance. Surface morphological studies using scanning electron microscopy (SEM) revealed distinct wear mechanisms across composites. The Cr10C10 and Cr15C5 composites demonstrated the lowest specific wear rates of 9.42 × 10–9 and 8.67 × 10–9 m3/Nm, respectively, under a 40 N load at 10 and 15 min, correlating with smoother worn surfaces and fewer micro-cracks. In contrast, the Cr0C20 composite displayed the highest specific wear rate (5.14 × 10–8 m3/Nm) at a 40 N load for 5 min, with SEM images showing more extensive matrix erosion and cenosphere pull-out. The inclusion of cenospheres at higher ratios increased mass loss, especially in high-load conditions, while balanced Cr–C reinforcements (e.g., Cr15C5 and Cr10C10) provided enhanced abrasion resistance and minimized surface damage. These findings underscore the potential for optimizing Cr and C inclusion ratios to develop wear-resistant polymer composites suitable for demanding structural applications. © Iran Polymer and Petrochemical Institute 2025.Item Surface enhancement of SS304 for high-temperature wear resistance using laser cladded Mo-alloyed stellite 6 coatings(Elsevier B.V., 2025) Aprameya, C.R.; Joladarashi, S.; Ramesh, M.R.Severe wear often limits the high-temperature durability of SS304 components, necessitating the development of surface-engineered solutions. In this investigation, Mo-reinforced Stellite 6 claddings were developed using Laser Directed Energy Deposition (L-DED) to provide enhanced surface protection. Claddings with (3, 6, and 9 wt%) Mo reinforcement enhanced hardness by 2.9, 3.1, and 3.3 times, respectively, compared to the SS304 substrate. This improvement is attributed to Mo-induced solid solution strengthening and the formation of hard intermetallic phases. Dry sliding wear tests were conducted at RT and 600 °C under (10 and 20 N) loads. Wear characterisation of the clads was performed using OM, XRD, FE-SEM, EDX, and Raman spectroscopy. At RT, claddings primarily exhibited abrasive wear with minor plastic deformation. However, at 600 °C, the wear mechanism evolved into a combination of severe adhesive, oxidative, abrasive, and plastic deformation modes, with oxidative wear governing the tribological behavior. Stellite 6 with 9 wt% Mo clads exhibited better tribological performance than the other two variants, owing to the development of oxide glaze layers of Cr2O3, NiO, CoO2, and Co3O4. Enhanced performance of the claddings is attributed to solid solution strengthening, Cr-rich carbide formation, increased dislocation density, and the L-DED technology enabling refined microstructure and strong metallurgical bonding. These findings highlight the potential for further advancements in Mo-reinforced Stellite 6 L-DED claddings for high-temperature wear applications. © 2025 Elsevier B.V.