Faculty Publications
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Item Buckling and free vibrations behaviour through differential quadrature method for foamed composites(Elsevier B.V., 2023) Duryodhana, D.; Waddar, S.; Bonthu, D.; Jeyaraj, P.; Powar, S.; Doddamani, M.The current work focuses on predicting the buckling and free vibration frequencies (fn) of cenosphere reinforced epoxy based syntactic foam beam under varying loads. Critical buckling loads (Ncr) and fn are predicted using the differential quadrature method (DQM). Ncr and fn have been calculated for beams of varying cenosphere volume fractions subjected to axial load under clamped-clamped (CC), clamped-simply (CS), simply-simply (SS), and clamped-free (CF) boundary conditions (BC′s). Upon increasing the cenosphere volume fraction, Ncr and fn of syntactic foam composites increases. These numerical outcomes are compared with the theoretical values evaluated through the Euler-Bernoulli hypothesis and further compared with experimental outcomes. Results are observed to be in precise agreement. The results of the DQM numerical analysis are given out for the different BC′s, aspect ratios, cenosphere volume fractions, and varying loads. It is perceived that depending on the BC′s, the type of axial varying loads and aspect ratios has a substantial effect on the Ncr and fn behaviour of the syntactic foam beams. A comparative study of the obtained results showed that the beam subjected to parabolic load under CC boundary conditions exhibited a higher buckling load. © 2023 The AuthorsItem Sound radiation and transmission behavior of auxetic core quadrilateral sandwich panels under supersonic flow(Taylor and Francis Ltd., 2025) Prajapati, V.K.; Jeyaraj, P.; Mailan Chinnapandi, L.B.Vibroacoustic performance of a quadrilateral sandwich plate under the synergetic effect of aerodynamic pressure and harmonic excitation is analyzed numerically. Layered approach is adopted to model the sandwich plate by considering the equivalent properties of the core and facings. Governing equations, developed utilizing Hamilton’s principle are solved based on differential quadrature approach to analyze the flutter frequency and forced vibration response. Subsequently, Rayleigh integral is used to estimate the acoustic response characteristics. Effect of geometric properties of the core (cell size, wall thickness, and inclined angle) and plate (leading, and trailing-edge angles) is examined. Critical aerodynamic pressure (CAP) is calculated first for the given case and the changes in response characteristics are investigated by varying the CAP. Results indicate that geometric parameters of the core does not influence the CAP, while the core thickness and the leading and trailing edge angles have significant effects. The sound power level (SWL) and transmission loss are observed to be maximum at CAP except in some cases of leading and trailing edge angles. © 2025 Taylor & Francis Group, LLC.