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Dynamic Response Analysis of a Three-Layered Circular Plate with Magnetorheological Fluid Core Under Low Velocity Impact Loading

Omidi Soroor, Amir Hossein | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53529 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. Various public transportation types, e.g., Trains, Buses, and Airplanes, are susceptible to damages made by the impacts of the external objects, which are typically classified as low to medium velocity impacts. This problem reveals the significance of investigating the effects of impact on thin-walled structures, which are the main components of these vehicles' bodies. Owing to the controllable rheological properties of the Magnetorheological fluid with respect to the magnetic field, it can be utilized to control the structure exposed to impact adaptively and minimize the damages. Due to this purpose, sandwich structures such as sandwich beams and plates, thanks to their extended response range to different types and levels of excitation, are a matter of interest for the researchers.In the present research, the dynamics of a three-layered Magnetorheological circular sandwich plate is investigated. The mentioned configuration is a typical approach in attenuation of excessive vibration of the target layer, i.e., constrained layer damping. The displacement field of the facings and the core layer are defined based on classical and first-order shear deformation theories, respectively. The equations of motion of the structure are derived using the Hamilton's principle, considering the von Kármán nonlinearity. In order to model the viscoelastic behavior of the core, the Kelvin-Voigt model is implemented. The discretization of the equations in the spatial domain is done through the Galerkin’s method, and the resulting equations are solved in the time domain using the Runge-Kutta approach.The validation process of the formulation and the developed code is done using the available literature and the results of finite element analysis. The effect of different parameters, e.g., the impactor's velocity and radius, magnetic flux density, core and constraining layers' thickness on the contact force, and central deflection of the plate, are thoroughly investigated. The results confirm the significant effects of these parameters on the dynamic response of the system
  9. Keywords:
  10. Nonlinear Dynamics ; Von Karman Theory ; Magnetorheological (MR)Fluid ; Low Velocity Impact ; Constrained Layer Damping (CLD) ; Circular Sandwich Plate

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