Browsing by Author "Naveen Kumar, H.S."

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    Mechanical properties of SiC nanoparticle-reinforced Al-2024 alloy
    (Gruppo Italiano Frattura, 2025) Niyaz Ahamed, M.B.; Naveen Kumar, H.S.; Anilkumar, S.K.; Ibrahim, A.; Doddamani, D.; Hareesha, G.
    This study investigates the mechanical properties of Al-2024 alloy reinforced with SiC nanoparticles, highlighting the effectiveness of ultrasonic-assisted stir casting in achieving uniform dispersion of the nanoparticles. The aim is to enhance the material's inherent limitations in hardness and overall mechanical performance under demanding conditions by incorporating SiC nanoparticles. The experimental investigation explores varying SiC content (1%, 2%, 3%, and 4%) and its relationship with tensile strength and hardness. The results indicate a substantial 31% enhancement in hardness and a 25% improvement in tensile strength, demonstrating the effectiveness of nanoparticle reinforcement. Furthermore, several strengthening mechanisms were found to be important contributors to yield strength, including the Orowan mechanism, dislocation strengthening, and grain refinement strengthening. A maximum variation of 13% between the experimental and predicted yield strength of the Al2024-SiCnp composite confirms the reliability of the predictive models employed. Overall, the results support SiC nanoparticles' ability to improve Al-2024 composites' mechanical characteristics for cutting-edge engineering uses. © 2025, Fracture and Structural Integrity (F&SI). All rights reserved.
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    Nonlinear analysis of two-directional functionally graded doubly curved panels with porosities
    (Techno-Press, 2022) Naveen Kumar, H.S.; Kattimani, S.
    This article investigates the nonlinear behavior of two-directional functionally graded materials (TDFGM) doubly curved panels with porosities for the first time. An improved and effectual approach is established based on the improved first-order shear deformation shell theory (IFSDST) and von Karman’s type nonlinearity. The IFSDST considers the effects of shear deformation without the need for a shear correction factor. The composition of TDFGM constitutes four different materials, and the modified power-law function is employed to vary the material properties continuously in both thickness and longitudinal directions. A nonlinear finite element method in conjunction with Hamilton’s principle is used to obtain the governing equations. Then, the direct iterative method is incorporated to accomplish the numerical results using the frequency-amplitude, nonlinear central deflection relations. Finally, the influence of volume fraction grading indices, porosity distributions, porosity volume, curvature ratio, thickness ratio, and aspect ratio provides a thorough insight into the linear and nonlinear responses of the porous curved panels. Meanwhile, this study emphasizes the influence of the volume fraction gradation profiles in conjunction with the various material and geometrical parameters on the linear frequency, nonlinear frequency, and deflection of the TDFGM porous shells. The numerical analysis reveals that the frequencies and nonlinear deformations can be significantly regulated by changing the volume fraction gradation profiles in a specified direction with an appropriate combination of materials. Hence, TDFGM panels can overcome the drawbacks of the functionally graded materials with a gradation of properties in a single direction. © © 2022 Techno-Press, Ltd.