Researchers in China have developed an ultra-tunable bistable structure with programmable energy barriers and trigger forces. The structures can be customized in various geometric configurations, dimensions, materials, and actuation methods for use in robotic applications. By reshaping the structure from the metastable state to any intermediate state, the energy barrier decreases, enabling smaller external stimulations to trigger fast snap-through.
Recently, a research team led by Dr. LI Yingtian from the Shenzhen Institute of Advanced Technology of the Chinese Academy of Sciences has proposed a type of ultra-tunable bistable structure with programable energy barriers and trigger forces of orders of magnitude differences. The structures can also be customized with varied geometric configurations, dimensions, materials, and actuation methods for various robotic applications.Schematic of the proposed ultra-tunable bistable structure.
By reshaping the structure from the metastable state to any intermediate state, the energy barrier decreases, meaning that smaller external stimulations are required to trigger the fast snap-through of the bistable structures. As the energy barrier keeps decreasing, the required external stimulation gets more and more delicate. That is how the researchers achieved a large range of adjustable trigger forces for the proposed controllable bistable structure.
“We can tune the structure to an ultra-sensitive state so that it will respond to a minute stimulation as gentle as a touch of a flying bee, while we could also set the structure to an insensitive state that even a steal ball weighing 110g could not break its energy barrier,” said Dr. LI.
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