نوع مقاله : مقاله مکانیک
نویسندگان
1 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه سمنان
2 دانشکده مهندسی مکانیک، دانشگاه سمنان
3 Department of Mechanical Engineering, Semnan University, Semnan, Iran
4 گروه مهندسی مکانیک دانشگاه سمنان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In this study, the free vibration analysis of a cylindrical panel and a sandwich plate with carbon–epoxy facesheets reinforced by shape memory alloy (SMA) wires and a polyurethane foam core reinforced with alumina nanoparticles was conducted in a thermal environment. The displacement field was formulated based on the third-order shear deformation theory (TSDT), and Hamilton’s principle was employed to derive the governing equations. The one-dimensional Brinson model was used to characterize the behavior of the SMA, and the problem was solved using the finite element method consistent with the third-order shear deformation theory. The effects of various boundary conditions, the volume fraction and prestrain of SMA wires, the nanoparticle volume fraction, fiber orientation, SMA wire temperature, and the geometric parameters of the panel on the natural frequencies were investigated. The results indicated that increasing the panel’s opening angle leads to an increase in the natural frequency of the structure, and the panel having a 15-degree opening angle exhibiting the highest natural frequency. Increasing the prestrain and volume fraction of the shape memory alloy wires postpones the onset of thermal increasing-induced degradation, thereby preserving the structural stability and integrity up to considerably higher temperatures. Different fiber orientation configurations, under identical structural conditions, enable access to a range of natural frequencies. Furthermore, the results demonstrated that by controlling the design parameters, the natural frequencies of the structure can be optimally tuned for specific applications.
کلیدواژهها [English]
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