Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Investigation on Influence of Geometry on Performance of a Cavity-less Pressure Sensor(Institute of Physics Publishing helen.craven@iop.org, 2018) Mathias, K.A.; Kulkarni, S.M.In recent years the automobile comfort and safety greatly improved by incorporation of specialized sensors. These sensors monitor the satisfactory working of different parts of an automobile by providing timely information to the driver. Tyre inflation pressure sensor is one of the important devices whose satisfactory working will improve tyre life as well fuel economy. The present work is focussed on modeling of a Cavity-Less pressure sensor for sensing inflation tyre pressure. Dielectric soft material for the sensor is taken as Silicone rubber. The sensor is modeled using finite element technique. The influence of width to thickness ratio of dielectric material for square geometry is studied. It is observed that change in capacitance increases with the applied pressure. The highest sensitivity of 4.79 fF/kPa is obtained for a sensor with width to thickness ratio of 100. © 2018 Published under licence by IOP Publishing Ltd.Item Experimental investigation on dielectric properties of composites using Taguchi technique(Elsevier Ltd, 2020) Manohar Shankar, B.S.; Mathias, K.A.; Kulkarni, S.M.Flexible composites find applications as dielectric elastomers. These composites are used as actuators and sensors. Solid silicone rubber-conductive filler composites are promising candidates for above applications. They are fabricated using compression moulding and evaluated for their dielectric properties, using Taguchi design of experiments. The influence of factors such as filler and curing agent loading, mixing time, curing temperature on the dielectric properties are presented. Permittivity increased to 14.1 and dielectric loss increased to 1.27 for the conductive filler loading of up to 12 parts per hundred rubber, while still being in insulator regime. © 2019 Elsevier Ltd. All rights reserved.Item Influence of filler and processing parameters on the mechanical properties of dielectric elastomer composites(Elsevier Ltd, 2020) Manohar Shankar, B.S.; Mathias, K.A.; Kulkarni, S.M.Dielectric elastomer composites are used as actuators and sensors. They convert electrical energy directly into mechanical energy and vice versa. Conductive and dielectric fillers are added to elastomers in order to improve its permittivity, thereby altering its mechanical properties. This study investigates the effect of conductive filler and processing parameters on the mechanical properties of dielectric elastomer composites fabricated using solid silicone rubber as matrix and ketjenblack as conductive filler using compression moulding process. The processing parameters such as amount of curing agent, mixing time and curing temperature also influence the mechanical properties. Maximum values of Young's modulus, density and shore A hardness recorded were 25.2 MPa, 1210 kg/m3 and 86 for the present study. © 2019 Elsevier Ltd. All rights reserved.Item Influence of filler on dielectric properties of silicone rubber particulate composite material(Elsevier Ltd, 2020) Mathias, K.A.; Hiremath, H.; Manohar Shankar, B.S.; Kulkarni, S.M.This paper deals with the development of silicone rubber particulate composites filled with strontium titanate to improve dielectric properties of neat silicone rubber. The composite material is prepared by a solution casting method with three different volume percentages of the filler. The composite samples prepared are tested for dielectric properties as per standards. The influence of filler on dielectric properties of composite material is studied by testing for dielectric permittivity, loss tangent, and ac conductivity. The dielectric permittivity experimentally obtained is compared with the available empirical models. The dielectric permittivity, loss tangent, and ac conductivity of silicone rubber composite increased with the increase of volume percentage of strontium titanate. Compared to neat silicone rubber the dielectric permittivity, loss tangent, and ac conductivity of the silicone rubber composite filled with 10% volume of strontium titanate is increased by 66%, 117%, and 267% respectively. Further, the empirical models confirmed that dielectric permittivity obtained is within the limit. The microscopic study reveals that the improved dielectric properties attributed to the stronger bond between the silicone rubber and the strontium titanate particles. © 2019 Elsevier Ltd. All rights reserved.