Analysis of magneto-mechanical coupling model and dynamic deformation characteristics of flexible magnetostrictive ribbon films considering fiber structure

Abstract

To address the growing demand for magnetostrictive micro-nano structural materials that exhibit both high performance and flexibility, it is essential to analyze and design the dynamic driving characteristics of magnetostrictive fiber ribbon film, which is crucial for further enhancing its working capability. This paper innovatively presents a state-space model to characterize the dynamic magnetostrictive deformation of fiber ribbon films with various structural parameters under applied magnetic fields. For the first time, fiber structure is explicitly incorporated into the description of its electro-magnetic-mechanical dynamic behavior. Phase trajectory analysis reveals the stability boundary during the driving process, and time-domain characteristics under different magnetic fields are simulated. The results indicate that magnetostrictive performance improves with increasing driving current, leading to bifurcation behavior at the critical current of 0.9A. At this time, the film exhibits bistable characteristics, repeatedly transitioning between two stable equilibrium positions. This motion enables the accumulation and release of energy through potential well crossing, thus achieving large magnetostrictive deformation output. Finally, the output characteristics under varying frequencies and amplitudes of driving current are evaluated, with a maximum deformation of 208 μm under combined 3.1A bias and alternating current excitation. These findings provide a theoretical basis for designing high-output flexible magnetoelectric transducers.