Faculty Publications
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Publications by NITK Faculty
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Item Study on effect of incorporation of SiC fillers on tensile and flexural behavior of GV composites by experimental and simulation methods(2008) Surendranathan, A.O.; Savitha, M.; SreenivasaPrasad, K.V.Characterization of engineering properties is a complex issue for fiber- reinforced composites due to their inherent anisotropy and in homogeneity. In terms of mechanical properties, advanced composite materials are evaluated by a number of specially designed test methods. In this study the incorporation of SiC fillers on Mechanical behavior of Glass-Vinyl ester (G-V) composites has been investigated. The composites are assessed by using J.J. Lloyd UTM. The properties like tensile strength, modulus, elongation at break, and flexural strength were investigated as per ASTM standards. From the experimental investigation, it is found that the tensile and flexural strength of G-V composites increased with increasing the SiC content. Also simulation of both tensile and flexural properties of GV composites with and without SiC fillers has been carried out to validate the experimental results. The fractured surfaces of G-V composites are observed using Scanning Electron Microscope (SEM) to reveal the results. © 2008 MS&T08.Item Synthesis and comparison of mechanical behavior of fly ash-epoxy and silica fumes-epoxy composite(Institute of Physics Publishing michael.roberts@iop.org, 2017) Sangamesh, R.; Ravishankar, K.S.; Kulkarni, S.M.Present day innovation requires materials with a typical combination of properties that are not possible by conventional metal, alloys, ceramics and polymeric materials. Particulate reinforcements for polymers are selected with the dual objective of improving composite properties and save on the total cost of the system. The point of this study is to utilize and compare the mechanical properties of filler (fly ash and silica fumes) reinforced epoxy composites. The composites of different proportions by percentage of matrix (100%), fillers (5%, 10% and 15%) volume are developed using hand lay-up process are tested for tensile and compression, according to ASTM Standards. From these mechanical properties, the flexural analysis of these composites is simulated. And which are characterized by Scanning electron microscopy for the fracture surface study, which reveals the brittle fracture, this also conforms from the Finite element analysis (FEA). And the overall mechanical properties of the fly ash reinforced polymer composites were found to have better than silica fumes reinforced composites. © Published under licence by IOP Publishing Ltd.Item High temperature gradient cobalt based clad developed using microwave hybrid heating(American Institute of Physics Inc. subs@aip.org, 2018) Prasad, C.D.; Joladarashi, S.; Ramesh, M.R.; Sarkar, A.The development of cobalt based cladding on a titanium substrate using microwave cladding technique is benchmark in coating area. The developed cladding would serve the function of a corrosion resistant coating under high temperatures. Clads of thickness 500 μm have been developed by microwave hybrid heating. A microwave furnace of 2.45GHz frequency was used at a 900W power level for processing. Impact of processing time on melting and adhesion of clad has been discussed. The study also extended to static thermal analysis of simple parts with cladding using commercial Finite Element analysis (FEA) software. A comparative study is explored between four variants of the clad being developed. The analysis has been conducted using a square sample. Similar temperature gradient is also shown for a proposed multi-layer coating, which includes a thermal barrier coating yttria stabilized zirconia (YSZ) on top of the corrosion resistant clad. The YSZ coating would protect the corrosion resistant cladding and substrate from high temperatures. © 2018 Author(s).Item Design Analysis and Experimental Validation of Modular Handling System for Satellite Ground Application(Springer Science and Business Media Deutschland GmbH, 2021) Srinivasa, G.A.; Srivastava, S.; Chandraker, S.Assembly Integration and Testing (AIT) of spacecraft involves a large number of handling operations which are carried out with the help of spacecraft handling system, it is one of the major hardware in Mechanical Ground Support Equipments (MGSEs). The conventional type of handling system consists of mild steel beam section and required many operations like drilling and welding for final hardware realization. Over the conventional handling system, a novel Modular Handling System (MHS) using aluminum extruded complex cross-section profiles with high strength-to-weight ratio is presented. The 1D beam FEA of these profiles gives only approximate results like maximum stress and deformations, so to analyze the assemblies for detailed stress distribution we need to adapt 3D/2D meshing but 3D meshing is complex for these cross sections and requires more solver time. Therefore, an approximation approach is adopted by using 2D shell element meshing over 1D element by maintaining moment of inertia to that of original profile of each cross section, and validated under the cantilever beam with point load condition of FEA results and compared with the analytical calculations. With confidence of these results the present work aimed to analyze MHS by using 2D mesh and perform linear static FEA to determine stresses and deflection. Further, MHS hardware is fabricated, assembled, and realized for experimental validation using strain gages with static loading test facility, and results are compared with finite element simulation results and found close match. The experimental validated MHS hardware successfully utilized for lifting the spacecraft’s sub-assembly/assembly during AIT activity. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Finite Element Analysis for Material Optimization of a Spur Gear by Radial Holes(Springer Science and Business Media Deutschland GmbH, 2022) Sutar, S.; Kumar, G.C.; Doddamani, M.Use of advanced materials in gear manufacturing lead to the best use of the material is achieved by geometric optimization, which uses less material. Removal of the material from gear makes lighter weight gear, and the simulation study helps in understanding their effects on stress distribution. This present research work focuses on removing material from the gear tooth for developing lightweight gears. Circular holes are introduced radially through the gear tooth and holes of 1.5 mm diameter created from top land of the gear tooth with varying depth from 5 to 20 mm. This leads to a volume reduction of 2.49% to a maximum of 12.451% as compared to no radial hole on gear. The analysis of CAD models created in CREO software of pinion and gear assembly is carried out in Ansys Workbench 17.2. Stresses in gear proposed are compared with the gear without a hole. The magnitude of stresses at the roots for both pinion and gear is observed and discussed. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item A study on the effect of multiple abrasive particle impact on the crater sphericity in AWJM using FEA(Elsevier Ltd, 2022) Balaji, B.; Satyanarayana, S.The workhorse of the Titanium alloy industry i.e., Ti-6Al-4 V, is classified among the foremost widely utilized Titanium (Ti)-alloys and is broadly utilized in aviation and medication industry where low-density, supreme quality and exceptional erosion resistance are required. Since this material has high strength, it is very hard to process by means of conventional methods of machining. Therefore, unconventional machining methods like Abrasive Waterjet Machining (AWJM) become of great importance. Current work exhibits an explicit modelling of multiple abrasive particles impact on Ti-6Al-4 V in AWJM using Finite Element Analysis (FEA) approach. For experimental verification purpose, the crater geometry made on the Ti-6Al-4 V were determined and compared with the crater sphericity values obtained through FEA simulation. Also, the influence of velocity of abrasive particles and jet impact angle on sphericity of the crater was examined. For experimental verification of FEA simulations, the impact angle emerged as a key process parameter. The error between the simulation and experimental crater sphericity values was below 20%. It was also observed that the simulation results were accurate upto 0.04% for 90° impact angle and overall, the simulation model showed better results for 220 m/s abrasive particle velocity. © 2022Item Methodology for Modelling a Custom SRM Configuration Using MATLAB/Simulink(Institute of Electrical and Electronics Engineers Inc., 2024) Jose, N.; Jayaraman, A.; Bhaktha, S.; Sarma, S.; Balasubramanian, B.; Gangadharan, K.V.Switched Reluctance Motors (SRMs) have gained significant attention in recent years due to their simplicity, robustness, and energy efficiency, making them suitable for various applications such as electric vehicles. However, the development of custom configurations for SRMs presents challenges due to limited options in existing simulation platforms like MATLAB/Simulink. This paper presents a comprehensive methodology for modelling and simulating a custom SRM configuration, specifically a 4-phase, 8/18 Multi-Teeth (MT) SRM, using MATLAB/Simulink. The methodology involves estimating Look-Up Tables (LUTs) using electromagnetic static Finite Element Analysis (FEA), developing mathematical models for phase current and torque, and integrating them into a Simulink model. After that, a closed loop speed control simulation using Hysteresis Current Control (HCC) and Anti-windup PID is applied to the created model. The simulation results demonstrate the effectiveness of the proposed methodology in accurately predicting the motor's performance. Additionally, a comparison with FEA results highlights the model's ability to closely replicate real-world behaviour, despite minor discrepancies attributed to differences in handling mutual phase coupling effects. © 2024 IEEE.Item Vertical stresses in soil below a three dimensional structure due to reinforced soil structure interaction(Research Trend T.C. 17/250(3), Chadiyara Road Poojapura, Trivandrum 695012, 2020) Patil, N.N.; Rajashekharswamy, H.M.; Shivashankar, R.Numerous problems in civil engineering involve interaction between the structures and the soil. This interaction plays a significant role in the response of a structure and may change the magnitude of displacements, stresses and other responses of a structure in comparison with the non-interactive analysis. In the non-interactive analysis, the structure is assumed to be resting on fixed supports and shall not undergo any relative motions. In Soil Structure Interaction (SSI) analyses, the displacements and stress resultants are found to deviate considerably from non-interactive analysis there by rendering the non-interactive analysis as unrealistic and it is absolutely necessary to consider SSI in the analysis and design of structures. In the present paper, the response of a three dimensional structure is studied in Reinforced Soil Structure Interaction (RSSI). RSSI refers to the interaction between the reinforced soil and the structure. Comparative numerical studies have also been carried out by using finite element analyses to study the effects of a 3D frame resting on unreinforced and reinforced soil by developing programmes, SSI-LIN, SSI-NLIN, RSSI-LIN and RSSI-NLIN for both the linear and non-linear analyses. SSI-LIN and RSSI-LIN are the programs developed to conduct linear analyses and SSI-NLIN and RSSI-NLIN are the programs developed to conduct nonlinear analyses. They are used to study displacements, stresses in soil and member end forces in the structure. The present paper discusses only the effects of SSI and RSSI analyses on stresses in soils. In this study, macro element approach is adopted as modelling the geogrid proves to be very difficult with apertures of size 33 × 25 mm. This is due to limitations of software and prolonged execution time. The vertical pressure at various points are not affected much in non-linear RSSI analysis compared to non-linear SSI. However there is reduction in longitudinal and transverse stresses in non-linear RSSI analysis compared to non-linear SSI. There is also a change in the pressure bulb below foundation level. Hence it is important to conduct RSSI studies. © 2020, Research Trend. All rights reserved.Item Effect of fiber aspect ratio and orientation on the thermal insulation property of short palm leaf fiber reinforced epoxy composite(Elsevier B.V., 2025) Sahoo, B.; Nanda, B.P.The evolution of research ensues new ideologies and methodologies, of which computational methods have been the most sought-after. Most of these computational techniques are based on finite element analysis (FEA). FEA is a cost-effective and time-reliable method for investigating complex problems. The present article uses the ANSYS APDL package to simulate the thermal insulation behavior of palm fiber reinforced composites w.r.t fiber aspect ratio and fiber orientation. For this, a cubical model is developed with cylindrical fibers of different aspect ratios and orientations inside it. It is found that the aspect ratio is inversely proportional to the insulation performance, and the horizontal orientation of fiber performs superiorly than the vertical orientation. The experimental data is also collected for different fiber loading (3.5, 5.5, 7.9, 9.3, and 19.2 vol%) conditions to validate the FEA model. It is observed that the bubble formation and their size and distribution during the composite fabrication are crucial for comparing the experimental and FEA results. © 2025 The Authors