Linear buckling behavior of power and sigmoid SF.G.FG cylindrical shells under axial compression or lateral pressure: a comparative study Prashant Kumar Choudhary, Subodh Kumar, Kulmani Mehar Aircraft Engineering and Aerospace Technology, 2025 Purpose This study aims to investigate the linear buckling behavior of functionally graded cylindrical shells under axial compression or lateral pressure. The shells are composed of functionally graded materials (FGMs), with through-the-thickness property variation defined by power-law (P-FGM) or a sigmoid-law (S-FGM) distribution. Design/methodology/approach The governing equilibrium and stability equations for the buckling analysis are derived based on classical shell theory. To determine a critical buckling load, an approximated solution is assumed which satisfies the boundary conditions as well as the governing equations. The finite element analysis in ANSYS is also used to determine the critical buckling load. Findings The findings indicate that P-FGM shells have a critical buckling load approximately 40% higher than S-FGM shells. The reason for the increment is that P-FGM shells have a higher effective stiffness, especially in bending, due to the material distribution profile. The analytical approach proved to be efficient, offering reduced computational effort compared to complex finite element models. Research limitations/implications The material is considered to be linear elastic, and the structures are free of imperfections. Originality/value The research focuses on examining the influence of material gradation using P-FGM and S-FGM model. It compares the critical buckling load of shells subjected to axial compression or lateral pressure. Overall, the results highlight the significant influence of material gradation on buckling behavior and provide insights for optimizing FGM shell configurations.
Supersonic flow over a different nose cone to reduce aerodynamic characteristic: a comparative study Ashish Narayan, Subodh Kumar, Nitish Kumar Gautam, Prasanna Phatate, Ritesh Kumar Aircraft Engineering and Aerospace Technology, 2025 Purpose The paper, titled “Supersonic Flow Over Different Nose Cone Designs to Reduce Aerodynamic Characteristics: A Comparative Study,” aims to investigate the impact of various nose cone shapes on aerodynamic performance at supersonic speeds. This study examines multiple nose cone designs, comparing their effects on drag, lift and overall stability, to identify configurations that reduce aerodynamic resistance and improve efficiency. By analyzing these designs under supersonic conditions, the research provides insights into optimal nose cone shapes for high-speed vehicles, offering valuable data for aerospace engineering and future applications in aircraft and missile design. Design/methodology/approach The study investigates the aerodynamic performance of various nose cone designs in supersonic flow to minimize drag and improve stability. A comparative analysis uses computational fluid dynamics simulations across different nose cone geometries. The methodology includes setting up flow conditions at a supersonic Mach number and examining parameters like pressure distribution, drag coefficient and flow separation. The approach evaluates these nose cone shapes to identify designs with the most favorable aerodynamic characteristics, aiming to enhance efficiency and control. Findings This study examines how nose cone shapes impact aerodynamic performance in supersonic flows. Computational simulations reveal that sharp-nosed cones reduce drag and enhance stability at high Mach numbers, while blunt designs increase drag. Findings highlight optimal nose shapes for improved fuel efficiency and durability in aerospace and defense applications. Originality/value To the best of the authors’ knowledge, this research provides original insights into nose cone design for supersonic flows, comparing various geometries to reduce aerodynamic drag and heat transfer. By examining specific shapes and their aerodynamic properties, this study contributes valuable data for optimizing nose cone designs, advancing efficient supersonic travel and supporting sustainable aerospace innovation.
Genetic algorithm-based optimization of fiber orientation in VAT composite plates for maximum thermal buckling temperature Prashant Kumar Choudhary, Subodh Kumar, Kulmani Mehar Polymers and Polymer Composites, 2025 This study presents an optimization framework to enhance the thermal buckling temperature of a variable angle tow (VAT) laminated composite plate. A finite element model is formulated using first-order shear deformation theory and eight-nodes iso-parametric elements. The developed model is validated by comparing the results of the present model with the existing benchmark solution. A genetic algorithm is employed to optimize the fibre’s path using MATLAB. The effect of geometric and material characteristics, such fiber orientation, aspect ratio, boundary conditions, material anisotropy, and thermal expansion coefficients is extensively examined. The results show that finite element-based optimization can improve the critical buckling temperature by up to 111.76%. These insights are valuable for the efficient structural design of variable-angle tows composite plates, offering potential benefits for various engineering applications.
Parallel Finite Element Analysis of 1D and 2D Problems of Heat Distribution in Mine Ventilation Galleries Ashish Narayan, Bhupal Kumar, Ranjan Kumar, Subodh Kumar Journal of Mines Metals and Fuels, 2023 The analyses of large-scale numerical problems of mining domain such as heat dissipation from rock strata to the ventilation air in large network of underground mine galleries are usually time taking process and require huge computational resources. To overcome this issue, High Performance Computing system (HPC) can be utilized to expedite the numerical analysis process for solving the problems within a reasonable time. In order to utilize HPC, this paper developed parallel finite element codes for solving heat conduction problems of mine galleries. The developed C++ codes of parallel FE are applied in solving 1D and 2D heat conduction problems. For the comparative analysis of 1D and 2D problems, the number of unknown nodes is fixed. It is observed that the computational time reduced when the number of processors increased. On the other hand, the computational time took longer time in 2D problem in comparison to that in 1D. Graphics User Interface (GUI) is also developed in terms of number of nodes of mesh, the boundary temperatures and length of the element. To sum up, the work of this paper reveals that the parallel computing is highly efficient in solving the large scale numerical geo-mining problems.
Hygrothermal effects on the mechanical properties of glass fibre-epoxy composite material 25th Technical Conference of the American Society for Composites and 14th US Japan Conference on Composite Materials 2010, 2010
RECENT SCHOLAR PUBLICATIONS
Genetic Algorithm-Based Optimization of Fiber Orientation in VAT Composite Plates for Maximum Thermal Buckling Temperature KM P. K. Choudhary, S. Kumar Polymers and Polymer Composites 33 (--), 1-27 , 2025 2025
Linear buckling behavior of power and sigmoid FG cylindrical shells under axial compression or lateral pressure: a comparative study PK Choudhary, S Kumar, K Mehar Aircraft Engineering and Aerospace Technology 97 (8), 968-976 , 2025 2025
Supersonic flow over a different nose cone to reduce aerodynamic characteristic: a comparative study A Narayan, S Kumar, NK Gautam, P Phatate, R Kumar Aircraft Engineering and Aerospace Technology 97 (6), 688-697 , 2025 2025
Supersonic Flow past a Bi-Conic Nose Cone: A Computational Parametric Study A Narayan, S Kumar, H Raza, M Kumar, GS Reddy, R Kumar Russian Aeronautics 68 (2), 378-392 , 2025 2025
GFRP Composite in Manufacturing of Industrial Robotic Arms T Prasad, M Seshu Kamal, S Kumar, T Jayananda Kumar, ... International Conference on Power Engineering and Intelligent Systems (PEIS … , 2025 2025
Free vibration characteristics of elastic foundation-supported porous functionally graded nanoplates using Rayleigh-Ritz approach AN Azmeera Sudheer Kumar, Subodh Kumar, Prashant Kumar Choudhary, Ankit Gupta International Journal of Structural Integrity , 2024 2024 Citations: 16
Free Vibration Response of Functionally Graded Porous Metallic Plates Embedded with Piezoelectric Layers RK Subodh Kumar, Prashant Kumar Choudhary Journal of Mines, Metals and Fuels, 71 ((10) 1), 645-1656 , 2023 2023 Citations: 3
Effect of porosity inclusions on the natural frequencies of the FGM plates using dynamic stiffness method S Rai, S Kumar, R Singh, A Gupta International Journal on Interactive Design and Manufacturing (IJIDeM) 17 (5 … , 2023 2023 Citations: 12
Determining the accurate free vibration response of thin functionally graded plates using the dynamic stiffness method SK Ankit Gupta, V R Shanmukhasundaram, Prashant kumar Choudhary Functionally Graded Structures Modelling and computation of static and … , 2023 2023 Citations: 4
Influence of Track Width, Wheel Base on Turning Radius and Static Behavior of Stub Axle, C-Clamp in Go-Karts Steering System JP Srivastava, K Suryateja, P Kumar, G Gangadhar Reddy, M Moizuddin, ... International Conference on Mechanical Engineering: Researches and … , 2023 2023 Citations: 1
Parallel Finite Element Analysis of 1D and 2D Problems of Heat Distribution in Mine Ventilation Galleries A Narayan, B Kumar, R Kumar, S Kumar Journal of Mines, Metals and Fuels, 151-160 , 2023 2023
A Comprehensive Review of Design and Development of Advanced Tailored Material on Sustainability Aspects AG Saurabh Rai, Subodh Kumar Sustainable Advanced Manufacturing and Materials Processing, 27 , 2022 2022
Accurate solution for free vibration behaviour of stepped FGM plates implementing the dynamic stiffness method PJ Subodh Kumar Structures 45, 1971-1989 , 2022 2022 Citations: 35
Application of dynamic stiffness method for accurate free vibration analysis of sigmoid and exponential functionally graded rectangular plates PJ S Kumar International Journal of Mechanical Sciences 163, 105105 , 2019 2019 Citations: 62
Free vibration analysis of thin functionally graded rectangular plates using the dynamic stiffness method S Kumar, V Ranjan, P Jana Composite Structures 197, 39-53 , 2018 2018 Citations: 110
Effect of volume fraction index and mass ratio on natural frequency of clamped functionally graded plate with attached point mass Md. Imran Ali, Subodh Kumar, Vinayak Ranjan International Conference on Electrical, Electronics, and Optimization … , 2016 2016 Citations: 6
MOST CITED SCHOLAR PUBLICATIONS
Free vibration analysis of thin functionally graded rectangular plates using the dynamic stiffness method S Kumar, V Ranjan, P Jana Composite Structures 197, 39-53 , 2018 2018 Citations: 110
Application of dynamic stiffness method for accurate free vibration analysis of sigmoid and exponential functionally graded rectangular plates PJ S Kumar International Journal of Mechanical Sciences 163, 105105 , 2019 2019 Citations: 62
Accurate solution for free vibration behaviour of stepped FGM plates implementing the dynamic stiffness method PJ Subodh Kumar Structures 45, 1971-1989 , 2022 2022 Citations: 35
Free vibration characteristics of elastic foundation-supported porous functionally graded nanoplates using Rayleigh-Ritz approach AN Azmeera Sudheer Kumar, Subodh Kumar, Prashant Kumar Choudhary, Ankit Gupta International Journal of Structural Integrity , 2024 2024 Citations: 16
Effect of porosity inclusions on the natural frequencies of the FGM plates using dynamic stiffness method S Rai, S Kumar, R Singh, A Gupta International Journal on Interactive Design and Manufacturing (IJIDeM) 17 (5 … , 2023 2023 Citations: 12
Effect of volume fraction index and mass ratio on natural frequency of clamped functionally graded plate with attached point mass Md. Imran Ali, Subodh Kumar, Vinayak Ranjan International Conference on Electrical, Electronics, and Optimization … , 2016 2016 Citations: 6
Determining the accurate free vibration response of thin functionally graded plates using the dynamic stiffness method SK Ankit Gupta, V R Shanmukhasundaram, Prashant kumar Choudhary Functionally Graded Structures Modelling and computation of static and … , 2023 2023 Citations: 4
Free Vibration Response of Functionally Graded Porous Metallic Plates Embedded with Piezoelectric Layers RK Subodh Kumar, Prashant Kumar Choudhary Journal of Mines, Metals and Fuels, 71 ((10) 1), 645-1656 , 2023 2023 Citations: 3
Influence of Track Width, Wheel Base on Turning Radius and Static Behavior of Stub Axle, C-Clamp in Go-Karts Steering System JP Srivastava, K Suryateja, P Kumar, G Gangadhar Reddy, M Moizuddin, ... International Conference on Mechanical Engineering: Researches and … , 2023 2023 Citations: 1
Genetic Algorithm-Based Optimization of Fiber Orientation in VAT Composite Plates for Maximum Thermal Buckling Temperature KM P. K. Choudhary, S. Kumar Polymers and Polymer Composites 33 (--), 1-27 , 2025 2025
Linear buckling behavior of power and sigmoid FG cylindrical shells under axial compression or lateral pressure: a comparative study PK Choudhary, S Kumar, K Mehar Aircraft Engineering and Aerospace Technology 97 (8), 968-976 , 2025 2025
Supersonic flow over a different nose cone to reduce aerodynamic characteristic: a comparative study A Narayan, S Kumar, NK Gautam, P Phatate, R Kumar Aircraft Engineering and Aerospace Technology 97 (6), 688-697 , 2025 2025
Supersonic Flow past a Bi-Conic Nose Cone: A Computational Parametric Study A Narayan, S Kumar, H Raza, M Kumar, GS Reddy, R Kumar Russian Aeronautics 68 (2), 378-392 , 2025 2025
GFRP Composite in Manufacturing of Industrial Robotic Arms T Prasad, M Seshu Kamal, S Kumar, T Jayananda Kumar, ... International Conference on Power Engineering and Intelligent Systems (PEIS … , 2025 2025
Parallel Finite Element Analysis of 1D and 2D Problems of Heat Distribution in Mine Ventilation Galleries A Narayan, B Kumar, R Kumar, S Kumar Journal of Mines, Metals and Fuels, 151-160 , 2023 2023
A Comprehensive Review of Design and Development of Advanced Tailored Material on Sustainability Aspects AG Saurabh Rai, Subodh Kumar Sustainable Advanced Manufacturing and Materials Processing, 27 , 2022 2022
