Elastic Snap-Through Instability

Bistable arch: two stable states separated by an energy barrier

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Snap-through buckling occurs when a shallow arch or bistable structure suddenly jumps from one stable configuration to another under sufficient load. The system exhibits a subcritical bifurcation — the energy landscape has two wells separated by a barrier. Venus flytraps and soft robotic actuators exploit this mechanism to achieve rapid, forceful actuation from slow loading.