Faculty Publications

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    Low-velocity Impact Response of Jute/Banana Fiber in Natural Rubber-Based Hybrid Composites: FE Approach
    (Springer, 2024) Kumbhare, K.; Mahesh, V.; Joladarashi, S.
    Green composites are proposed as environmentally friendly, easily recycled, and reusable advanced composite materials. The present study aims at studying the damage done by low-velocity impact (LVI) of jute and banana fiber-based green composites using commercial finite element (FE) software. The LVI response is evaluated for flat, hemispherical, and conical impactors at three velocities of 5, 10, and 15 m/s. Hybrid composites are modeled in two stacking sequences: jute-rubber-banana-rubber-jute (JRBRJ) and banana-rubber-jute-rubber-banana (BRJRB). These hybrid green composites are compared to their pure fiber counterpart composites, i.e., jute-rubber-jute-rubber-jute (JRJRJ) and banana-rubber-banana-rubber-banana (BRBRB). The ABAQUS Finite Element Modeling software is used to model, and the explicit dynamic solver is used to simulate these proposed composites. The absorbed energy at 5 m/s for flat impactor for JRJRJ and BRBRB is 3.5 J and 0.52 J, respectively, whereas for JRBRJ and BRJRB is 2.3 J and 1.4 J, respectively. Similar results are obtained for 10 and 15 m/s. The energy absorbed follows a sequence JRJRJ > (JRBRJ, BRJRB) > BRBRB. The flat impactor has more damage due to its larger contact area and high energy absorption at higher velocities. Impact due to conical impactor shows local penetration and lower energy absorption. Results show that the proposed composites exhibit better energy absorption due to a flexible matrix and more resistance to damage due to the involvement of a hybrid structure which makes the composite stiffer. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Suitability study of jute-epoxy composite laminate for low and high velocity impact applications
    (American Institute of Physics Inc. subs@aip.org, 2018) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    This paper discusses the effect of thickness on the energy absorbing ability of the jute-epoxy (JE) laminate under low velocity and high velocity impact conditions. In the present analysis, a parametric study has been carried out choosing three different thickness values of laminate (6 mm, 8mm and 10 mm) and four different velocities each under low (2m/s, 4m/s, 6m/s and 8 m/s) and high velocity (100 m/s, 150 m/s, 200 m/s and 250 m/s) impact conditions. A Damage behavior study has been carried out under both low and high velocity impacts to assess the suitable condition of application for JE laminate. It is found that, the energy absorbing ability of laminate increases with increasing laminate thickness and impact velocity, especially at higher values of impact velocity of the chosen regime. The outcome of the study of damage behavior under low and high velocity impact shows that JE laminate is suitable for low velocity impact applications rather than high velocity impact applications. © 2018 Author(s).
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    Study on stacking sequence of plies in green sandwiches for low velocity impact application
    (Trans Tech Publications Ltd ttp@transtec.ch, 2019) Mahesh, V.; Joladarashi, J.; Kulkarni, S.M.
    The present paper deals with optimizing the stacking sequence configuration of flexible green composite for cladding application under low velocity impact regime. Initially six configurations of green composite comprising of jute fiber and natural rubber matrix are considered and their energy absorption behaviour and resistance to impact are studied using finite element analysis. The configurations considered are optimized for energy absorption and maximum contact force under low velocity impact condition. From the results it can be concluded that the variation in energy absorbed and sp. energy absorbed among the configurations are negligible and hence the configurations are prioritized based on contact force. JRJRJ configuration provides maximum contact force followed by JRJ, JRRJ, RJRJR, RJRJ and RJR. The configurations with rank 1, 2 and 3 should be taken into consideration for further analysis. Also the damage study shows that the stacking sequence with jute on impact side is better compared to rubber on impact side as tearing type of damage can be observed in sequences with rubber on impact side and no damage is visible with jute on impact side. © 2019 Trans Tech Publications, Switzerland
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    Geometrically nonlinear vibration attenuation of functionally graded magnetoelectro-elastic shells
    (American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2019) Kattimani, S.; Joladarashi, S.; Mahesh, V.
    In this paper, Geometrically Nonlinear Vibrations (GNV) of Functionally Graded Magneto-Electro-Elastic (FGMEE) shells integrated with a patch of Active Constrained Layer Damping (ACLD) treatment is studied. In case of FG material, properties vary along the z-coordinates using power-law index. Finite element model is developed for FGMEE doubly curved shell using a shear deformation theory by considering non linearity to analyze the FGMEE shell. The structure consists of magnetostrictive material (CoFe2O4) and piezoelectric material (BaTiO3) FGMEE doubly curved shell with piezoelectric composite (1-3 PZC) is used as a constraining layer for viscoelastic layer, which is modelled using Golla-Hughes-McTavish (GHM) method. The analysis is carried out in time domain by considering the effects of coupling coefficients, curvature ratio and patch location on the behaviour of the nonlinear frequency of the shell. The amplitude of vibrations reduces considerably by considering the active ACLD patches (1-3 PZC) of the FGMEE shell with nominal control voltage. © 2019 ASME
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    Influence of laminate thickness and impactor shape on low velocity impact response of jute-epoxy composite: FE study
    (Elsevier Ltd, 2019) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    This paper aims at numerical and parametric investigation on the outcome of low velocity impact (LVI) response of jute/epoxy (JE) composite of varied thickness subjected to impact at varied velocity of impact within LVI regime using different shaped impactors. The JE composite laminate with varying thickness of 6 mm to 10 mm is subjected to LVI at impact velocity varying from 2 m per second (mps) to 8 mps using impactors of hemispherical (HS), flat (F) and conical (C) shapes. Modelling and simulation of the proposed JE composite laminate is achieved using explicit software available commercially with target as deformable material and the impactor as a rigid body. Simulations are carried out for available possible combination of thickness, impact velocity and impactor shapes. Results reveal that thickness is one of the crucial factors that decide the LVI response of the proposed composite laminate. Laminate impacted with conical shaped impactor results in maximum absorption of energy and the laminate impacted with flat shaped impactor results in bigger and immediate damage. © 2019 Elsevier Ltd.
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    Comparative study on energy absorbing behavior of stiff and flexible composites under low velocity impact
    (American Institute of Physics Inc. subs@aip.org, 2019) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    This paper deals with the comparative study on the energy absorbing behaviour of the flexible composites with that of stiff composites aiming at automobile cladding application. Two types of composites namely Jute-Epoxy (JE) laminate and Jute-Rubber-Jute (JRJ) sandwich are chosen for the purpose of study under impact velocity varying from 2.5 m/s to 10 m/s. The study is carried out using commercially available finite element simulation software. The energy absorption and damage behavior of both the composites are studied. From the results, it was found that JRJ sandwich absorbs almost 54%, 51.2%, 58.1% and 61.78% more energy compared to JE laminate for impact velocity of 2.5 m/s, 5 m/s, 7.5 m/s and 10 m/s respectively and exhibits compliant nature as opposed to JE laminate which exhibits brittle nature. The energy absorption ratio of JRJ sandwich is more compared to JE laminate. Thus, the JRJ sandwich composites are expected to provide better energy absorption, reduce damage propagation under low velocity impact, thereby making them a potential material for automobile structural protective claddings. © 2018 Author(s).
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    Slurry erosive study and optimization of material and process parameters of single and hybrid matrix flexible composites using Taguchi approach
    (American Institute of Physics Inc. subs@aip.org, 2020) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    The present study is aimed at comparing the slurry erosive behaviour of single matrix flexible composite (SMFC) with hybrid matrix flexible composite (HyMFC) made from jute fiber and natural rubber. Natural rubber based bonding gum is used as the second matrix for HyMFC, whereas the natural rubber sheet acts as matrix in case of SMFC. Both SMFC and HyMFC with stacking sequences namely jute/rubber/jute (JRJ), jute/rubber/rubber/jute (JRRJ) and jute/rubber/jute/rubber/jute (JRJRJ) are considered in the present study. Process parameters varied in the present study are rotation speed and sand concentration, each at three levels. Taguchi's L9 orthogonal array is used to optimize the process and material parameters for minimizing the slurry erosive wear. It was found through statistical studies that the main factor affecting the weight loss is the sand concentration. The optimum material and process parameters are found which resulted in minimal loss of weight due to erosion by slurry. The proposed hybrid matrix flexible composite (HyMFC) with vulcanized rubber bonding gum is feasible for cladding applications since they provide resistance to erosion in the slurry medium. © 2020 Author(s).
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    Comparative study on kevlar/carbon epoxy face sheets with rubber core sandwich composite for low velocity impact response: FE approach
    (Elsevier Ltd, 2021) Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    Recent trend has shifted towards replacing the conventional materials by fiber reinforced polymer composites for various structural applications since the fiber reinforced polymer composites exhibit high strength, lighter weight and low cost. This paper work concentrates on analysing the low velocity impact response of two types of sandwich composites namely kevlar epoxy with rubber core (KE-R-KE) and carbon epoxy with rubber core (CE-R-CE) in terms of energy absorption and damage mitigation. Modelling and analysis is carried out by making use of commercially available explicit finite element (FE) software. Results reveal that kevlar based sandwich composite outstands the carbon based composite both in terms of energy absorption by 37.7% and the energy absorption ratio of KE-R-KE is 1.36 times more compared to CE-R-CE sandwich composite. The damage study reveals that both the proposed sandwich composites exhibit similar damage mechanism dominated by matrix cracking followed by fiber breakage and delamination. The presence of rubber as core material helps in mitigating the damage to the bottom facesheet. © 2021 Elsevier Ltd. All rights reserved.
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    Parametric study on impact behaviour of sisal and cenosphere reinforced natural rubber-based hybrid composites: FE approach
    (Elsevier Ltd, 2021) Rajkumar, D.; Mahesh, V.; Joladarashi, S.; Kulkarni, S.M.
    This paper aims to study the impact analysis of sisal fiber and cenosphere filler reinforced natural rubber composite using commercially available finite element software. The proposed green composite is studied for impact behaviour by varying the weight percentage of the cenosphere filler particles in a natural rubber sheet. Composite is modelled with stacking sequence sisal-rubber-sisal using finite element software and impacted by three different rigid impactors (Conical, Hemi-spherical and Flat) at the velocity of 8m/s. Modelling and simulation of this proposed composite laminate are solved using the explicit dynamic solver of Abaqus Computer-Aided Engineering Finite Element Modelling. The results of the low-velocity impact of the proposed green composite with sisal-rubber-sisal stacking sequence exhibit better energy absorption by varying the weight percentage of the Cenosphere. Also, the energy absorbed by laminate was more for the Conical impactor than the Hemi-spherical and Flat impactors and the extent of damage is more when impacted by the Flat impactor due to its larger contact area. © 2021 Elsevier Ltd. All rights reserved.
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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