Abstract
In this paper, we investigate the possibility of flexible manipulation of elastic waves propagating in soft periodic plates through topological state shifting. We design a soft 1D phononic crystal by connecting two different periodic plates made of hyperelastic materials. By choosing different geometrical parameters of the two plates, topologically protected state of elastic waves is observed at the interface between them. Since the hyperelastic material can undergo large elastic deformation, flexible and efficient shifting of topological state can be realized by applying appropriate pre-stretch on the structure. The interface state wave modes can be either activated or deactivated by an applied pre-stretch on the structures with different initial geometrical parameters. Due to the advantageous property that topologically protected wave modes are stable against any defects and disorders, it provides a robust way of manipulating waves propagation in real time. The system and the strategy proposed here have great potential in constructing various novel acoustic devices.
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