Dynamic Snap-through Characteristics And Damping Property Of Composite Laminated Bi-stable Structures

Morphing structures that can change shape or state in order to change their operating characteristics or as a response to changes in the environmental conditions have important potential applications in industrial sectors such as aerospace and piezoelectric energy harvester. The multi-stable structures can remain in their equilibrium after a shape change occurs and have become a possible candidate for morphing structures. Snap-through phenomenon between two stable shapes happens in a relatively short period of time and it has a significant meaning for the configuration control of morphing structures, piezoelectric energy harvester efficiency and energy dissipation to analyze the dynamic process of snap-through accurately. This paper focuses on the bi-stable structures obtained from composite laminate plates cooling process and proposes an analytical model that can be used to analyze dynamic response of bi-stable structure; analyze energy dissipation process during dynamic transition and evaluate the damping properties of bi-stable structures. The research contents of this paper are as followed:(1) High accuracy dynamic analytical model of bi-stable composite laminate plate. Because classic analytical model can’t predict the dynamic snap-through of bi-stable phenomenon.This paper proposes a refined analytical model based on the classic model. The refined model applies Hamilton’s principle in conjunction with Rayleigh-Ritz method and establishes governing equations of dynamic process. Besides expand the analytical model to calculate the energy dissipation during dynamic process. Analytical model shows high accuracy compared with the results of finite element method(FEM).(2) Dynamic response of bi-stable composite laminate plate. Snap-through phenomenon from one stable shape to another happens in a relatively short time and shows geometric nonlinear behavior. Accurate analysis of the dynamic snap-through process has important significance. Apply the analytical model to study the dynamic response of different parameters when structures are subjected to the steady-state excitation or transient impact. The research shows:The magnitude load must reach a critical value when snap-through occurs and the frequency and magnitude of stimulation show a couple effect on the dynamic response. Meanwhile the cooling process also has an influence on the critical value of snap-through.(3) Damping properties of bi-stable composite laminate plate. Evaluate the damping properties of bi-stable structures and adapt analytical model to research energy dissipation during vibration. The snap-through phenomenon shows outstanding ability because of longer displacement obtained from snap-through Compared with FEM results, it proves the expanded model can analyze energy dissipation accurately. Finally this paper discusses some parameter influence on energy dissipation.