Abstract
Wave coupling exists in asymmetrical structures. In this work, we numerically and experimentally study wave coupling behaviors in one-dimensional origami metamaterials with uncoupled creases. Unlike conventional one-dimensional asymmetrical structures, the coupling characteristics in origami structures can be tuned and rich bandgap regulation can be achieved. By utilizing wave coupling, new flexural-wave bandgaps can be opened and shaped by folding. We propose a coupling ratio to explain different wave coupling phenomena with respect to the folding angles and structure parameters. Based on a proper realization of the creases and with two orthogonal fiber Bragging grating (FBG) displacement sensors, several experiments are performed to support our arguments on wave-coupling behaviors. Through this research, we also provide a systematic analyzing approach and an experimental method in studying coupling waves. Despite focusing on the crease-uncoupled origami structures, the provided multi-dimensional sensing technique enables one to study general origami metamaterials with coupled creases.
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