Achieving symmetric snap-through buckling via designed magnetic actuation.

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Symmetric snap-through buckling is theoretically possible and practically useful in bistable systems but rarely observed.
• Most studies focus on asymmetric snapping due to its lower energy barrier, with symmetric snapping previously limited to high loading rates.

Purpose of the Study:

• To present a universal strategy for achieving symmetric snap-through buckling under quasi-static conditions.
• To suppress asymmetric snapping modes in bistable systems through novel M-interface pattern design.

Main Methods:

• Designing specific magnetization (M)-interface patterns to suppress asymmetric buckling modes.
• Developing a simplified theoretical model analyzing pitchfork and saddle-node bifurcations.
• Validating predictions through simulations and experiments with hard magnetic elastomers.

Main Results:

• Demonstrated a universal strategy to achieve symmetric snapping under quasi-static conditions.
• Identified that multiple M-interfaces generate resisting forces that enable distinct symmetric configurations.
• Uncovered a quasi-linear scaling law between critical magnetic fields and snapping order for higher-order symmetric snapping.

Conclusions:

• Established a robust framework for designing snapping systems with enhanced control and predictability.
• Showcased a mechanical-magnetic snapping switch demonstrating the practical application of the developed strategy.
• Paved the way for advanced applications in precision engineering and magnetic-mechanical actuation.