Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MULTI-OBJECTIVE OPTIMIZATION OF THE MODAL CHARACTERISTICS OF TOW STEERED CFRP PLATES
Submission Author:
Daniel de Almeida Pereira , SP , Brazil
Co-Authors:
Daniel de Almeida Pereira, Thiago de Paula Sales, Domingos Rade
Presenter: Daniel de Almeida Pereira
doi://10.26678/ABCM.COBEM2019.COB2019-2415
Abstract
In recent years, automatic fiber placement (AFP) machines have allowed the realization of variable stiffness composite laminates. Among these, tow steered composites have been considered very promising. The problem of finding the optimal lamination sequence (lay-up) to maximize a specific design requirement is usually solved with design optimization. It is known that carbon-fiber reinforced polymers (CFRP) can be designed in order to improve damping characteristics by properly tuning geometric features such as fiber orientation. Therefore, the objective of this paper is to present a multi-objective optimization of CFRP tow steered plates, aiming at maximizing modal frequencies and damping factors. Fiber trajectories are taken as design variables, as one tries to explore the benefits brought up by the steering technique. The dynamic model is derived by using a semi-analytical approach based on the combination of the Classical Lamination Theory with the Rayleigh-Ritz approach. The modal damping factors are calculated using the Strain Energy Method, which is based on the ratio between the stored and the dissipated energies, giving the specific damping capacity (SDC) for each vibration mode. Finally, the multi-objective optimization problem is solved using a variant of the NSGA-II algorithm. Results show that the tow steered plates are the best choice for maximizing the modal damping and frequency characteristics of the considered plates for different boundary conditions.
Keywords
Composites, tow steering, strain energy method, damping, Multi-Objective Optimization
