TY - JOUR ID - 21793 TI - Nonlinear oscillations of viscoelastic microcantilever beam based on modified strain gradient theory JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Taheran, F. AU - Ahmadian, M. T. AU - Firoozbakhsh, K. AD - School of Mechanical Engineering, Sharif University of Technology, Tehran, P.O. Box 11155-9567, Iran Y1 - 2021 PY - 2021 VL - 28 IS - 2 SP - 785 EP - 794 KW - Microcantilever beam KW - Multiple time scale method KW - Nonlinear free vibration KW - Strain Gradient Theory KW - Viscoelastic material DO - 10.24200/sci.2020.54137.3612 N2 - A viscoelastic microcantilever beam is analytically analyzed based on the modified strain gradient theory. The Kelvin Voigt scheme is used to model the beam viscoelasticity. Applying Bernoulli-Euler inextensibility of the centerline condition via Hamilton’s principle, the nonlinear equation of motion and related boundary conditions are derived based on shortening effect theory and discretized by Galerkin method. Inner damping, nonlinear curvature effect, and nonlinear inertia terms are applied. The generalized derived formulation in this article, allows modeling of any nonlinearity combinations such as nonlinear terms arises due to inertia, damping, and stiffness, as well as modeling the size effect via considering modified coupled stress or modified strain gradient theories. First mode nonlinear frequency and time response of the viscoelastic microcantilever beam are analytically evaluated utilizing multiple time scale method and validated by numerical findings. Results indicate that the nonlinear terms have an appreciable effect on natural frequency and time response of a viscoelastic microcantilever. Furthermore, the investigation reveals that due to the size effects, natural frequency enhances drastically, especially when the thickness of the beam and the length scale parameter are comparable. Outcomes clarify the importance of size effects in analyzing of the mechanical behavior of small scale structures. UR - https://scientiairanica.sharif.edu/article_21793.html L1 - https://scientiairanica.sharif.edu/article_21793_66e456ad4200507fdffc44b3ea2e8fbb.pdf ER -