Analytical Modeling for Transverse Vibrations of Glass Fiber/Epoxy Composites Reinforced with Carbon Nano Particles

نوع: Type: thesis

مقطع: Segment: Masters

عنوان: Title: Analytical Modeling for Transverse Vibrations of Glass Fiber/Epoxy Composites Reinforced with Carbon Nano Particles

ارائه دهنده: Provider: Zahra Ghahremanian

اساتید راهنما: Supervisors: Dr.Alireza Shooshtari

اساتید مشاور: Advisory Professors: Dr.Mohammad rafiee

اساتید ممتحن یا داور: Examining professors or referees: Dr.Mahdi karimi,Dr.Mahdi Shaban

زمان و تاریخ ارائه: Time and date of presentation: 15/3/2022 4pm

مکان ارائه: Place of presentation: online

چکیده: Abstract: In this study, the transverse vibrations of the of fiber glass- epoxy composite plate reinforced by carbon nanoparticles have been investigated. For this purpose, the motion equations of the composite plate are written based on the third-order shear deformation theory. Then using the mode functions that satisfy the boundary conditions, the equations of motion are written in terms of time, and then by the Galerkin method the nonlinear partial differential equations of motion are converted into five ordinary nonlinear differential equations.Since these ordinary nonlinear equations are coupled together, they have become a nonlinear ordinary differential equation. Using this differential equation, the linear natural frequency of the composite plate is extracted and the method of multiple scales is used to obtain the nonlinear natural frequency and the ratio of nonlinear natural frequency to linear natural frequency.Then the effects of mechanical parameters on the amount of the natural frequency of the composite plate is investigated, so that the composite plate is reinforced by two types of nanoparticles and the effects of these nanoparticles and their mass percentages on the linear natural frequency and the ratio of nonlinear natural frequency to linear natural frequency Have been reviewed and the results have been validated with existing laboratory results. Finally, the effects of geometric parameters including thickness and length-to-width ratio of composite plate on linear natural frequency and the ratio of nonlinear natural frequency to linear natural frequency of composite plate without nanoparticles and composite plate reinforced by nanoparticles with different mass percentages have been studied. The results are compared in tables and graphs. According to the results, the natural frequency increases with the reinforcement of the composite plate by carbon nanoparticles, but increasing the mass percentage of carbon nanoparticles decreases the natural frequency. On the other hand, with increasing plate thickness, the natural frequency decreases, but with increasing the length to width ratio of the plate, the natural frequency increases.

فایل: ّFile: Download فایل