Faculty Publications
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Item Ballistic Impact Study on Jute-Epoxy and Natural Rubber Sandwich Composites(Elsevier Ltd, 2018) Sangamesh, R.; Ravishankar, K.S.; Kulkarni, S.M.Since ages, human beings have used different methods to protect themselves and their armors from the impact of bullets/projectiles by using structures made up of wood, metals, glass and sand bags etc. These protective structures are heavy and incur cost and inconvenience to transport. Of late, they are replaced by structures of polymers and their composites, because of their light weight and good corrosion resistance. Ballistic impact analysis of composite materials is necessary in order to establish their use in military, aerospace and automotive applications either through experimental studies or using modeling techniques. The aim of the present investigation is to model and analyze the behavior of composites for ballistic impact. Residual velocity, energy absorption and ballistic limit for three different materials Jute-Epoxy (JE), Rubber (Ru), Jute-Epoxy-Rubber sandwich (JRE) for three thicknesses (5, 10, 15mm) and at three velocities (150, 250, 350 m/s) is studied. The study exhibits a significant amount of energy absorption in rubber, almost 10 times as compared to JE plate. Also damage observed was ductile in the case of rubber, while brittle in JE. Sandwich composites (JRE) displayed energy absorption and ballistic limit on par with rubber plates. Thus the applicability of these sandwiches in ballistic impact is established as better energy absorbing protective target structures. © 2017 Elsevier Ltd.Item Modeling of single and multilayer polyvinylidene fluoride film for micro pump actuation(2010) Karanth P, P.N.; Desai, V.; Kulkarni, S.M.Micro pumps are essential components of micro devices such as drug delivery systems. Large numbers of pumps have been proposed based on different actuating principles. Piezoelectric actuation offers advantages such as reliability and energy efficiency. Lead zirconate titanate (PZT) based piezoelectric actuation for micro pumps is predominantly explored despite its disadvantages such as brittle nature, low straining and difficulties in processing. Polymer piezoelectric materials like polyvinylidene fluoride (PVDF) could be promising replacements for PZT owing to their availability in form of films and good strain coefficients. Very limited literature on micro pump with PVDF as an actuator is available. In this paper, finite element analysis (FEA) model of a micro pump actuator using single and multilayer PVDF for actuation is developed in ANSYS. The model takes into account the influence of driving voltage and actuator. Copyright © Springer-Verlag 2009.Item Comparative Study on Impact Responses of Sandwich Composites with Stiff and Compliant Core Materials(Semnan University, Faculty of Mechanical Engineering, 2025) Sadashivaiah, M.K.T.; Kulkarni, S.M.; Joladarashi, S.The current investigation focused on the Finite element analysis (FEA) study on the outcome of sandwich composite's low to high-velocity impact responses. The sandwich structure comprises jute, natural rubber as skin, and epoxy/ natural rubber as a core, mixed with sand as a filler (0%-40%) material for bonding skin, and core B-stage cured natural-based prepreg is employed. The structure is impacted with a low velocity of 10 m/sec, an Intermediate of 50 m/sec, a high-velocity impact of 100m/sec, and ballistic velocity impact of 350 m/sec. Based on the results in terms of energy absorption, filler plays a vital role in increasing energy absorption capabilities for all configurations. The sandwich structure with rubber as the core offers better energy absorption capability because of its flexible nature. For further study, sandwich structures with a 40% sand filler were examined, with a velocity limit of 350 m/s. Varying the core thickness from 5 to 20 mm revealed that increasing the core thickness and filler composition in both configurations results in 0.37% for FR40F and 1.70% for FE40F higher energy absorption. Rubber core sandwiches outperformed epoxy core, suggesting the potential utility of rubber and sand-filled cores in ballistic-loaded sandwich structures. © 2025, Semnan University, Faculty of Mechanical Engineering. All rights reserved.