Design and analysis of a tunable multistable mechanical metamaterial
International Journal of Mechanical Sciences(2024)
摘要
Multistable mechanical metamaterials can have unusual properties that facilitate promising applications, including reusable vibration isolation and efficient energy absorption. In this paper, we propose a tunable multistable mechanical metamaterial (TMMM) that is capable of independent and continuous adjustment of its post-fabrication mechanical properties. The unit cell of the TMMM consists of a sinusoidal beam and several supporting beams, with its mechanical behavior finely tuned by inserting specially designed connecting beams into the gaps of the supporting beams. We adopt a combined theoretical and numerical approach to explore the effect of geometric parameters and identify the design space of monostability and bistability. Based on the unit cell, a multilayer TMMM is designed and fabricated and its tunable mechanical response is investigated. The results show that not only the force-displacement curves but also the snap-through behavior and deformation order can be tuned in a straightforward manner. The proposed design has the potential to enhance the development of multistable mechanical metamaterials and broaden their applications in engineering scenarios with varying demands.
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关键词
Multistable metamaterials,Tunable properties,Snap-through,Deformation order
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