Conference Papers
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Item Finite element formulation for passive shape control of thin composite plates with integrated piezoelectric layer(Springer Science and Business Media, LLC, 2008) Kadoli, R.; Kendri, R.G.The Hamilton’s principle for piezoelectric materials and the strain displacement relations based on the classical laminate theory’s kinematics of deformation are utilized in deriving the piezoelectroelastic finite element equations of motion. Lagrange interpolation functions for in-plane displacement and Hermite cubic shape functions (conforming type) for transverse deflection are implemented through a four noded rectangular element. The formulation does not account voltage as the nodal degree of freedom. The computer code developed for composite plates with integrated piezoelectric sensors and actuator layers has been extensively validated for piezoelectric behaviour, static deflection and free vibration. The laminate deflection suppressed depends on the magnitude of the voltage applied, and this is a passive method of shape control. The effect of fibre orientation, stacking sequence and number of plies has been part of the numerical exercise on passive shape control. © Springer Science + Business Media B.V. 2008.Item Mechanical and magnetic analysis of magnetostrictive disc brake system(2010) Kumar, K.P.; Kadoli, R.; Kumar, M.V.A.The present work is related to an electrically driven magnetostrictive brake for use in brake system of the vehicles, more particularly design of magnetostrictive actuator for moving friction pads in disc brake back and forth thus, capable of readily accomplishing intelligent braking functions similar to that achieved using antilock braking system. The detail of the mechanical and magnetic circuit design of magnetostrictive disc brake is elaborated here. ©2010 IEEE.Item Effect of thermal treatment on the wear behavior of lean duplex stainless steel and super duplex stainless steels(Institution of Engineering and Technology journals@theiet.org, 2013) Naveen Kumar, R.; Davangeri, M.B.; Joshi, A.G.; Narendranath, S.; Kadoli, R.The duplex stainless steel (DSS) is a two phase microstructure of about equal proportion of austenite (chromium- nickel) and ferrite (chromium). Austenite is ductile in nature and ferrite is brittle in nature, this combination provides an excellent mechanical properties (hardness, impact toughness etc) and corrosion resistance [1]. This paper deals with the study of dry sliding wear of Lean duplex stainless steel (AISI 304) and super duplex stainless steel (AISI 310) as a function of heat treatment conditions. The wear test specimens were heat treated at 850°C and followed by oil quenching. These wear tests are carried out using pin on disk technique at; (i) constant sliding velocity and different sliding distances, (ii) constant sliding distance and different sliding velocity and (iii) varying load and the weight loss methodology is used to calculate the wear volume. Results related to the AISI 304 wear showed that the hardness introduced due to the presence of sigma phase plays an important role on wear behavior for this type of steel.Item Design of sprue bush for a plastic injection mould: A machine perspective(Association for Machines and Mechanisms, 2013) Lakkanna, M.; Kadoli, R.; Mohan Kumar, G.C.Design methodology and criteria to configure sprue bush for enhancing functionality is systematically compiled from plastic injection moulding machine perspective. Sprue conduit's sensitivity to moulding objectives are quantitatively ghettoised as expansion ratio on the basis of ubiquitous empirical relationships. This generic, simple, inexpensive preventive criterion enables sprue bush conduit geometry design to exemplifying the melt injection specifically for a particular machine. Continuous Sensitivity Equation Method (CSEM) was adopted to sensitise sprue conduit expansion over infinite dimensional range exclusively for injection rate, maximum injection pressure and barrel size. Inferred results were exponential in nature with injection rate having direct proportionality, while maximum injection pressure and barrel size had inverse proportionality to conduit expansion off parting plane. Off them injection rate was found to be relatively more influential than injection pressure and barrel size.Item Design and study of magnetization characteristics of a magnetostrictive (Tb0.3Dy0.7Fe1.95) actuator under zero pre-stress conditions for direct current input(2013) Joshi, R.; Kadoli, R.This paper presents the design of actuator using magnetostrictive material under zero prestress conditions for direct current input, which is being developed to move friction pads of a disc brake for braking action. Comparison of analytical, experiment and Maxwell simulation of coils in free air is being carried out to predict the magnetic field generated by them and magneto motive force reaching the measuring end of magnetostrictive material. Experiments are being conducted to verify the performance of magnetostrictive actuator for dc input under zero-preload conditions. A set of magnetization curves are being predicted using Jiles-Atherton model in the context of control applications that require an accurate characterization of the relation between input applied magnetic field and strain output by the actuator. Further the validation of Jiles-Atherton model results is being done with the results obtained from experiments. © (2013) Trans Tech Publications, Switzerland.Item State-of-the-art finite element modeling of rotorcraft main rotor blade root end for bird strike damage analysis(Soc. for the Advancement of Material and Process Engineering bookorders@sampe.org, 2016) Vijaya Kumar, R.V.; Naik, D.C.; Kadoli, R.; Narendranath, S.This paper demonstrates the state-of-the-art composite modeling methodology to investigate the bird strike phenomenon using available numerical bird models through experimental tests and simulation tools. The present work is based on the application of non-linear explicit finite element analysis to simulate the response of rotorcraft main rotor blade root end under high velocity impact load. The damage behavior of blade under soft body impact depends upon bird size, blade size, blade span wise location of impact and bird orientation with respect to hitting location, blade rotational speed and rotorcraft cruise speed. Bird model is considered as hydrodynamic with length to diameter ratio of 2. A bird strike event is characterized by loads of high intensity and short duration. A transient explicit non-linear finite element based impact analysis using Autodyn has been carried out to predict bird strike resistance to withstand 1.0 kg bird at critical flight condition. Numerical analysis indicates that blades do not tear which agrees well with the physical test conducted. © 2016 by Hindunstan Aeronautics Limited. Published by the Society for the Advancement of Material and Process Engineering with permission.Item Effect of Sigma (σ) phase on Mechanical and Dry sliding wear(Elsevier Ltd, 2017) Davanageri, M.; Narendranath, S.; Kadoli, R.In this paper, the wear behaviour of heat treated (oil and water quenched) super duplex stainless steel (SDSS) AISI 2507 was studied using dry sliding wear test rig. Initially as received materials was solution treated at 1050°C for duration of 2 h to achieve a balanced austenite (γ) and ferrite (δ) microstructure. The effect of different heat treatment techniques on microstructure and wear behaviour was studied by heat treating specimen at 850°C for duration of 1 h and was followed by oil and water quenching. The microstructure and crystal structure were studied through scanning electron microscope (SEM) and X-ray diffraction. The sliding wear test was employed with variation in load and speed at constant sliding distance. The results reveal that wear rate increased with increase in wear parameters. The oil quenched exhibited better wear resistance than water quenched and solution treated specimen. The worn surface morphology were analysed through SEM micrographs. © 2017 Elsevier Ltd.Item Finite Element Wear Behaviour Modeling of Super duplex stainless steel AISI 2507 Using Ansys(Institute of Physics Publishing helen.craven@iop.org, 2018) Davanageri, M.B.; Narendranath, S.; Kadoli, R.In this paper the finite element simulation approach has been employed for the work that has been recently carried out by Davanageri et al.(2017). The super duplex stainless steel AISI 2507 material was heat treated at 850°C with different ageing time (30, 60, 90 minutes), followed by water quench. The heat treatment was carried out to encourage the precipitation of inter-metallic secondary sigma phase (σ). The study of dry sliding wear behavior was carried out with the pin-on-disc equipment. The heat treatment and ageing time increases the hardness of the duplex steel, resulting in improved wear resistance. The Archard wear model and finite element software ANSYS WORKBENCH-16 was used to determine the wear volume loss. The specific wear rate or dimensional wear coefficient is the most significant factor in the wear volume calculation and it varies with material and operating parameters. The study shows that frictional coefficient varies with material properties (hardness) at similar operating condition. Finally the results reveal that there is a good agreement that exists between the simulated (FE) values and those of the experimental values. © Published under licence by IOP Publishing Ltd.Item Transverse deflection and vibration of curved sandwich beam(American Institute of Physics Inc. subs@aip.org, 2019) Nirmalkumar, R.; Kadoli, R.; Joladarashi, S.Finite element method (FEM) is used to calculate the static deflection and free vibration of a curved sandwich beam made of the isotropic stiff layer and viscoelastic core. Beam element having four degrees of freedom (DOF) per node is considered in the study. A displacement model based on linear and cubic polynomial is assumed to arrive at the shape functions which are substituted into strain energy and kinetic energy equation to find out stiffness and mass matrix respectively. Static deflection and free vibration frequency are verified experimentally for cantilever boundary condition. © 2019 Author(s).Item Finite element and differential quadrature solution for natural frequency of a clamped-free pipe conveying fluid(American Institute of Physics Inc. subs@aip.org, 2019) Chandurkar, S.; Kadoli, R.The governing equation for the pipe conveying fluid is solved numerically using beam finite element and differential quadrature approach. It is well known that the governing equation for a pipe conveying fluids comprises of shear force due to bending, centripetal force, the force due to Coriolis acceleration, inertia force due to pipe and fluid mass. The detailed procedure on the differential quadrature method to solve the governing equation of the pipe conveying fluid has been outlined for finding out the natural frequency of pipe conveying fluid. Numerical exercises are presented for the vibration of pipe transporting fluid for the case of clamped-free pipe such that the transverse deflection at the clamped end is fully constrained however rotation of the normal is partially permitted. The error in the natural frequency obtained from the finite element and differential quadrature approach with respect to analytical solution ranges from 2.7 to 3.8%. © 2019 Author(s).