Dynamic Actuation Modes in Magneto-Responsive Bistable Structures: A Rate-Dependent Approach
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The use of structural instabilities allows for swift responses triggered by mechanical force or specific displacement thresholds. The advent of responsive materials has facilitated the adaptation of such structural instabilities into actuators that promptly deform under external stimuli. Nevertheless, the rapid transitions between equilibrium states entail significant viscoelastic roles at the material level, influencing the structural behavior on a larger scale. Our study offers a comprehensive understanding of the impact of viscoelastic effects on bistable structural transitions, incorporating both a novel experimental perspective and a thorough modeling analysis. These findings are applied to magneto-responsive bistable structures, presenting a roadmap for designing effective actuation conditions. The bistable transition's functionality relies on the interplay between the magnetic field amplitude and application rate. The comprehension of viscoelastic and magneto-mechanical coupling enables efficient actuation through temporal magnetic pulses, eliminating the need for sustained magnetic fields. Ultimately, we integrate these insights to create a responsive structural component, enabling modulation of transient and steady bistable transitions based on the application rate of external magnetic stimuli.
