Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Bhagat, V.

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    Buckling and Free Vibration Characteristics of a Uniformly Heated Isotropic Cylindrical Panel
    (Elsevier Ltd, 2016) Bhagat, V.; Jeyaraj, P.; Murigendrappa, S.M.
    In this paper buckling and free vibration characteristics of an isotropic cylindrical panel subjected to uniform temperature rise has been investigated using finite element method. The procedure involves the determination of critical buckling temperature, which is followed by modal analysis considering pre-stress due to the thermal field in the cylindrical panel. Detailed studies are carried out to analyze the influence of curvature ratio, thickness ratio and aspect ratio on the critical buckling temperature and free vibration behavior of an isotropic cylindrical panel. It has been found that as the curvature ratio and the thickness ratio increases the thermal buckling strength of the cylindrical panel decreases. It has also been found that free vibration frequencies reduce with an increase in temperature and the reduction is more significant for the lowest frequency mode. It is observed that free vibration mode shapes at ambient temperature changes with an increase in temperature. © 2016 The Authors.
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    Optimization of buckling strength and fundamental frequency of uniformly heated cylindrical panel using PSO
    (Institute of Electrical and Electronics Engineers Inc., 2017) Bhagat, V.; Jeyaraj, P.; Murigendrappa, S.M.
    In the present study, thermal buckling and fundamental frequency of symmetrically laminated cylindrical panel is optimized. Fiber orientation is considered as a design variable for the same. Eigenvalue buckling analysis and modal analysis is performed by using finite element method. Particle swarm optimization is used as optimization technique. MATLAB code is generated to integrate finite element method with particle swarm optimization. Finally, the influence of aspect ratio (L/S), curvature ratio (R/S), thickness ratio (R/h), effect of different weighting factors and boundary constraints on the optimum results are investigated. © 2016 IEEE.
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    Buckling and Free Vibration Behavior of a Temperature Dependent FG-CNTRC Cylindrical Panel under Thermal Load
    (Elsevier Ltd, 2018) Bhagat, V.; Jeyaraj, P.; Murigendrappa, S.M.
    Present study deals with the buckling and free vibration behavior of functionally graded carbon-nanotubes reinforced composite (FG-CNTRC) cylindrical panel exposed to uniform thermal load. Stresses setup due to thermal load and temperature dependent properties influences the buckling and free vibration behavior of the heated structures. Approach employed in the present study consists of static analysis to compute thermal stresses, eigen-value buckling analysis to compute critical buckling temperature and finally modal analysis, taking thermal stresses into account. Influence of different CNTs grading pattern, CNTs volume fraction, geometric parameters, boundary constraints and temperature dependent properties on the buckling strength are investigated. It is observed that hybrid CNTs distribution pattern gives comparatively higher buckling strength and free vibration frequencies. Investigation on free vibration characteristics of the FG-CNTRC panel at elevated temperature signifies that the decline in free vibration frequencies is very drastic at a temperature close to buckling temperature along with temperature dependent properties. c 2017 Elsevier Ltd. All rights reserved. © 2018 Elsevier Ltd.
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    Vibro-acoustic behaviour of functionally graded graphene reinforced polymer nanocomposites
    (American Institute of Physics Inc. subs@aip.org, 2020) Pious, D.; Jacob, J.; George, N.; Bhagat, V.; Chacko, T.; Jeyaraj, P.
    This study conducts an investigation into the vibro-acoustic behavior of polymer nano composites reinforced with functionally graded graphene. The numerical analysis is conducted using both finite element method and Rayleigh integral. Free and forced vibration characteristics are conducted to understand the sound characteristics in depth. The influence of various parameters such as type of functional grading, loading and boundary conditions are also observed. Results shows that natural frequency of a structure is heavily dependent on the type of functional grading of the structure, while the mode shapes are observed to be impervious to these changes. The type of functional grading is also seen to influence the resonant amplitude of vibration and acoustic response. This influence is duly produced in the bandwise calculation of sound power which suggests that FG-X distribution of graphene is to be used for lower frequency levels. © 2020 Author(s).