Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
NONLINEAR DYNAMICS OF A SELF-FOLDING STRUCTURE ACTUATED BY SMA
Submission Author:
Larissa Fonseca , RJ
Co-Authors:
Larissa Fonseca, Marcelo Savi, Alberto Paiva
Presenter: Larissa Fonseca
doi://10.26678/ABCM.DINAME2017.DIN17-0065
Abstract
Origami, the ancient Japanese art of paper folding, creates a sculpture representation through pattern folds of a flat paper sheet producing a desired shape. Origami-based structures have been increasingly investigated and applied in various fields of knowledge. The majority of these applications are motivated by adaptive and compacting capacities. The use of smart materials is an important issue for actuation of origami systems. Shape memory alloys (SMAs) and magnetic materials are of special interest due to their capacity to generate forces and displacements. Since origami systems are slender structures, they are usually close to stability limits with important dynamical issues to be investigated. In this paper, a dynamical investigation of an origami structure called "origami-ball" actuated by shape memory alloys elements are carried out. It is proposed a one-degree of freedom oscillator to represent the origami-ball dynamics based on geometric analysis and symmetry assumptions. A constitutive model with internal constraints is employed to describe the thermomechanical behavior of the SMA actuator. The system has constitutive and geometric nonlinearity presenting rich and complex responses. Numerical simulations treat different conditions associated with external stimuli, considering thermal and mechanical loads. Results show periodic and irregular responses. Situations where inputs can change the expected operation of the origami are highlighted.
Keywords
Smart Structures, Origami system, Nonlinear Dynamic, Shape Memory Alloy, Self-foldable System
