Browsing by Author "Battina, N. Malleswararao"

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    Analysis of vibration characteristics and buckling behaviour of rotating fiber graphene reinforced composite pre-twisted shells /
    (Transactions of the Canadian Society for Mechanical Engineering, 2025-02-10) Battina, N. Malleswararao
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    Analysis of Vibration characteristics and buckling behaviour of rotating Fiber-Graphene-Reinforced Composite Pre-twisted Shells
    (Transactions of the Canadian Society for Mechanical Engineering, 2025-02-10) Battina, N. Malleswararao
    This study presents a novel approach to analyze the vibration and buckling behaviour of pre-twisted fiber-reinforced polymer composite shells reinforced with graphene inclusions. A key novelty lies in incorporating graphene's size-dependent mechanical properties are derived from nanoscopic empirical equations into the analysis. This allows for a more accurate prediction of the overall mechanical response of the composite, particularly at the nanoscale. The Halpin-Tsai model is employed to determine the equivalent elastic constants of the graphene-reinforced matrix, and a finite element formulation based on curved shear deformable shell theory is developed. The model's accuracy is validated against existing experimental or numerical results. Also, this study provides a comprehensive parametric analysis, investigating the influence of key factors such as graphene volume fraction, twist angle, aspect ratio, hub radius, and rotation speed on the vibration frequency and buckling load of the pre-twisted shells. These findings offer valuable insights for the design and optimization of lightweight and high-performance composite structures utilized in aerospace, automotive, and other engineering applications.
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    Influence of double-pass friction stir welding and blank position on formability of aluminum tailor welded alloy blanks /
    (Springer Nature, 2024-08-17) Battina, N. Malleswararao
    This study delved into the significance of double-pass friction stir welding (DP-FSW) and blank arrangement on aluminum tailor-welded blanks (TWBs) formability. The five different positions of TWBs fabricated from solution-annealed and precipitation-hardened AA2017-T6 and AA6061-T6 were utilized in experimentation and finite element analyses that evaluated formability. This effect of welding parameters and blank positions on TWB formability characteristics was investigated thoroughly through an extensive analysis that included experimental tests and finite elemental analysis. The results showed that adopting double-pass FSW approaches, against single-pass methods, significantly improved formability. Furthermore, the investigation of different blank positions during the welding process exhibited distinctive effects on formability, and the best configurations were found. These insights provide valuable guidance for optimizing FSW processes in producing aluminum TWBs, thus contributing to advancements in lightweight material fabrication across diverse industrial applications. The experimental and simulated results have a standard deviation of ± 5%. The deviation was decreased by treating the blank as five different zones rather than there.