Faculty Publications
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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 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.