Faculty Publications
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Publications by NITK Faculty
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Item Thermal induced motion of functionally graded beams subjected to surface heating(Ain Shams University, 2018) Malik, P.; Kadoli, R.Thin beam of the functionally graded (FG) type subjected to a step heat input on one surface and insulated or exposed to convective heat loss on the opposite surface is under consideration for the evaluation of thermal induced motion. The dynamic displacement and dynamic thermal moment of the beam are analysed when the temperature gradient is independent of the beam displacement. The power law index dictates the metal–ceramic distribution across thickness of the beam and its effect on the thermal vibration of the beam is examined. The article discusses, in depth, the influence of various factors such as length to thickness ratio of beam, heat transfer boundary conditions, physical boundary conditions, and metal–ceramic combination on the thermal oscillations of FG beam. It is found that attenuation of the amplitude of static thermal deflection and superimposed thermal oscillations is a strong function of the metal–ceramic combination for the FG beam. © 2015 Faculty of Engineering, Ain Shams UniversityItem Validation of Thermal and Thermo-Elastic Responses in Fixed-Free Functionally Graded Beams Under Localized Heating(Springer Science and Business Media Deutschland GmbH, 2025) Malik, P.; Kadoli, R.The combination of multiple constituent materials, when spatially graded, enables the creation of composite materials with tailored physical properties, making them ideal for applications in defense, aerospace, energy, and medical sectors. This study focuses on developing functionally graded materials (FGMs) with two extreme physical properties: high-temperature resistance and high strength, specifically investigating SUS316-Al2O3 beam composites. SUS316-Al2O3 beams were fabricated using the plasma spraying technique. The microstructural analysis revealed distinct gradation patterns, with plasma-sprayed beams exhibiting a layered gradation. The thermo-elastic behavior of FGM, along with pure SUS316 beams, was evaluated under thermal loads ranging from 2.925 W to 23.9 W. The SUS316-Al2O3 FGM beams displayed elastic deflection at higher thermal loads, indicating their potential for high-performance applications. A 2.23% decrease in frequency and thermal deflection of 0.6 mm was observed when the beam was heated to a temperature of 890C for about 5 min. The findings suggest that functionally graded SUS316-Al2O3 beams offer enhanced thermo-elastic properties, making them suitable for demanding applications requiring high-temperature resistance and strength. © The Society for Experimental Mechanics, Inc 2025.Item A multi-unit miniature thermomagnetic generator using half-Heusler (MnNiSi)1?x(Fe2Ge)x alloy for harvesting low-grade waste heat(Institute of Physics, 2025) Silambarasan, M.; Kadoli, R.; Kondaiah, P.; Deepak, K.This study focuses on designing and analyzing a series of thermomagnetic generators for efficient low-grade waste heat energy harvesting, addressing the challenge of bulky thermal harvesters that cannot be integrated into small mechanical structures. A miniature harvester with a total height of 16 mm and a diameter of 8 mm was designed. Using a single heat source at a maximum temperature of 450 K, the system drives multiple thermomagnetic generator units connected in series. Each unit utilizes thermomagnetic material with (MnNiSi)1-x(Fe2Ge)x compositions with x values of 0.3, 0.32, 0.33, and 0.34. These materials operate within a Curie temperature range of 300 K to 420 K, enabling continuous operation as the heat transfers between units. Finite element analysis, conducted through COMSOL Multiphysics, was employed for numerical simulation to study the system’s performance. Results show that the three-unit series configuration achieved a peak voltage of 0.2 V per oscillation and 200 oscillations within 60 s. The sequential arrangement of units maximizes residual heat utilization and offers practical applications in industrial waste heat recovery, automotive heat management, and renewable energy systems. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.