Nonlinear Modeling of Bolted Lap Jointed Structure with Large Amplitude Vibration of Timoshenko Beams

Journal of Solid Mechanics

مقاله 16، دوره 11، شماره 1، خرداد 2019، صفحه 222-235   

نوع مقاله: Research Paper

شناسه دیجیتال (DOI): 10.22034/jsm.2019.664231

نویسندگان

M Jamal-Omidi^* ؛ F Adel

Department of Aerospace Engineering, Space Research Institute, Malek Ashtar University of Technology, Tehran, Iran

چکیده

This paper aims at investigating the nonlinear behavior of a system which is consisting of two free-free beams which are connected by a nonlinear joint. The nonlinear system is modelled as an in-extensional beam with Timoshenko beam theory. In addition, large amplitude vibration assumption is taken into account in order to obtain exact results. The nonlinear assumption in the system necessities existence of the curvature-related and inertia-related nonlinearities. The nonlinear partial differential equations of motion for the longitudinal, transverse, and rotation are derived using the Hamilton’s principle. A set of coupled nonlinear ordinary differential equations are further obtained with the aid of Galerkin method. The frequency-response curves are presented in the section of numerical results to demonstrate the effect of the different dimensionless parameters. It is shown that the nonlinear bolted-lap joint structure exhibits a hardening-type behavior. Furthermore, it is found that by adding a nonlinear spring the system exhibits a stronger hardening-type behavior. In addition, it is found that the system shows nonlinear behavior even in the absence of the nonlinear spring due to the nonlocal nonlinearity assumption. Moreover, it is shown that considering different engineering beam theories lead to different results and it is found that the Euler-Bernoulli beam theory over-predict the resonance frequency of the structure by ignoring rotary inertia and shear deformation.

کلیدواژه‌ها

Bolted lap joint structure؛ Local nonlinearity؛ Nonlocal nonlinearity؛ Timoshenko Beam Theory؛ Nonlinear vibration

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