Conference Papers
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Item Behaviour of Natural Rubber in Comparison with Structural Steel, Aluminium and Glass Epoxy Composite under Low Velocity Impact Loading(Elsevier Ltd, 2017) Mahesh, M.; Joladarashi, S.; Kulkarni, S.M.This paper presents the low velocity gravity impact behaviour of various materials (Structural steel, Aluminium, Rubber and Glass Epoxy composite). A comparison of the above said materials is reported considering various parameters such as Total Energy, contact force, deformation, von mises stress and strain and specific energy absorbed are carried out. The results confirmed that rubber absorbs more energy compared to other materials considered thus highlighting its potential use in structural applications subjected to low velocity impact. The natural rubber in many ways is an ideal polymer for dynamic or static engineering applications. It has excellent dynamic properties, with a low hysteresis loss, and good low temperature properties, it can be bonded well to metal parts, has high resistance to tear and abrasion and it is relatively easy to process. Natural rubber composites find technological interest in that they exhibit additional features like biodegradability and renewability, along with the inherent stiffness, low cost and low density. The great advantage of natural rubber based on its linear elasticity, high strength, fatigue life and excellent adhesion to metals makes it well suited for structural or semi structural applications. © 2017 Elsevier Ltd.Item Modelling and Analysis of Material Behaviour under Normal and Oblique Low Velocity Impact(Elsevier Ltd, 2018) Mahesh, M.; Joladarashi, S.; Kulkarni, S.M.The present article deals with analysis of various engineering materials (rubber, steel, aluminum and glass epoxy) under low velocity gravity impact loading normal to the plate as well as at an oblique angle of 20 degrees. Impact damage remains a major concern for structural components; the impact of objects can create internal damage that can significantly reduce their structural strength, because of its complex nature. The investigation of low velocity impact remains an area of interest and has received much attention. Very few research work have been done on the oblique impact behaviour of composites, where most of them concentrates on high-velocity impact conditions. The study on low-velocity oblique impact of composites are scare. Comparison of the above said materials is reported considering various parameters such as total energy, contact force, deformation, von Mises stress and strain and specific energy absorbed. Specific energy absorbed by each material considered are compared both under normal impact and oblique impact and the results confirmed that rubber absorbs 11.72 times more energy than structural steel, 3.24 times more energy than aluminium and 1.8 times more energy than glass epoxy, when subjected to normal impact. In case of oblique impact at 20 degrees rubber absorbs 47.6 times more energy than structural steel, 14 times more energy than aluminium and 8.6 times more energy than glass epoxy. This makes rubber as an ideal polymer for dynamic structural applications subjected to low velocity impact under oblique condition. © 2017 Elsevier Ltd.Item Influence of Coupled Material Properties of BaTiO3 and CoFe2O4 on the Static Behavior of Thermo-Mechanically Loaded Magneto-Electro-Elastic Beam(Elsevier Ltd, 2018) Mahesh, M.; Kattimani, S.C.The present article deals with analyzing the influence of volume fraction (Vf) of Barium Titanate (BaTiO3) and Cobalt-Ferric oxide (CoFe2O4) and its corresponding coupled material properties on the static response of multiphase magneto-electro-elastic (MEE) cantilever beam. Using finite element (FE) methods, the variations of direct and derived quantities across the beam thickness are evaluated. The different volume fractions ranging from Vf =0.0 to Vf =1.0 are considered for analysis. The equilibrium equations are presented with the help of the total potential energy principle and coupled constitutive equations of MEE materials. The numerical results suggest that the displacement components vary accordingly with the volume fraction. In addition, it is found that the maximum electric potential is observed for Vf =0.2 due to pyro-effects, whereas maximum magnetic potential is obtained for Vf =0.0. The numerical study is extended to analyse the layered MEE beam. The influence of stacking sequence and different mechanical load forms on the direct quantities of the beam is evaluated. It is believed that for the precise design of any smart structure, the credibility of the material properties plays a significant role. Hence, in this regard an attempt has been made to understand the behavior of multiphase MEE beams with respect to different volume fractions of Barium titanate (BaTiO3) and Cobalt-Ferric oxide (CoFe2O4). © 2017 Elsevier Ltd.Item Finite element simulation of low velocity impact loading on a sandwich composite(EDP Sciences edps@edpsciences.com, 2018) Mahesh, M.; Joladarashi, S.; Kulkarni, S.M.Sandwich structure offer more advantage in bringing flexural stiffness and energy absorption capabilities in the application of automobile and aerospace components. This paper presents comparison study and analysis of two types of composite sandwich structures, one having Jute Epoxy skins with rubber core and the other having Glass Epoxy skins with rubber core subjected to low velocity normal impact loading. The behaviour of sandwich structure with various parameters such as energy absorption, peak load developed, deformation and von Mises stress and strain, are analyzed using commercially available analysis software. The results confirm that sandwich composite with jute epoxy skin absorbs approximately 20% more energy than glass epoxy skin. The contact force developed in jute epoxy skin is approximately 2.3 times less when compared to glass epoxy skin. von Mises stress developed is less in case of jute epoxy. The sandwich with jute epoxy skin deforms approximately 1.6 times more than that of same geometry of sandwich with glass epoxy skin. Thus exhibiting its elastic nature and making it potential candidate for low velocity impact application. © The Authors, published by EDP Sciences, 2018.Item Influence of Ti coated tools on process parameters in turning process of MDN431(American Institute of Physics Inc. subs@aip.org, 2020) V Badiger, P.V.; Desai, V.; Ramesh, M.R.; Mahesh, M.; Santhosh, C.M.; Prajwala, B.K.; Raveendra, L.Tungsten carbide tool places in are coated by customized composition of Ti/TiCN/TiN/TiCN/TiN for multilayer and monolayer TiC-C using PVD assisted CAE technique. Quality physiognomies of coatings are evaluated using VDI3198 and Calo tests. Thickness of the coatings for Ti-multilayer and monolayer are found to be 1.837 and 1.198 μm respectively and adhesion quality of HF1 attained. Highly alloyed steel MDN431 is used as machining material to evaluate the performance of coatings. The coated tool insert performance has been evaluated at the machining parameters cutting speed in the range of 59-118 m/min, feed rate is 0.062-0.125 mm/rev and depth of cut is ap 0.2-0.4 mm during machining of MDN431 steel. Experiments are conducted based on L27 full factorial design. Cutting forces and surface roughness are analysed using regression analysis. Desirability approach as well as PSO technique is used to optimize the process parameters. Least cutting force and surface roughness are obtained at the condition of Vc-118 m/min, f-0.063 mm/rev, ap-0.2 mm and Vc-59 m/min, f-0.63 mm/rev, ap - 0.2 mm for Ti-multilayer and TiC-C coatings respectively. To augment the capability of predictive regression models and coefficients of determination (COD), ANN modelling has been adopted. Cutting forces and surface roughness are predicted using ANN and mathematical regression models, predicted data follows the experimental data with minimum absolute error. Tool wear was reduced by 65.7% in Ti-multilayer and TiC-C coated tools compared to uncoated tool. © 2020 Author(s).Item Hygrothermal response analysis of MEE beam embedded in adaptive wood through FE methods(American Institute of Physics Inc. subs@aip.org, 2020) Mahesh, M.; Ravichandra, H.N.; Kattimani, S.C.; Nagaraja, C.V.The present article evaluates coupled response of magneto-electro-hygrothermo-elastic (MEHTE) beam under framework of finite element methods. Through principle of total potential energy, equations of motions are derived. Solutions are obtained by incorporating the condensation procedure. Credibility of proposed formulation is validated by comparing the outcomes with previously published literature. Results reveal that with higher magnitude of hygrothermal loads, the static parameters of MEHTE beam significantly increases. Further, a comparative study between the thermal load alone and combined hygrothermal load reveals that the moisture effect plays a significant role in coupled response. The present work also attempts to evaluate the effects of various in-plane hygro-thermal loading profiles. Among the various hygrothermal loads considered, uniform hygrothermal load is found to have a predominant effect. Numerical examples are offered to assess individual effect of moisture as well. © 2020 Author(s).