座屈後形状記憶合金の動的力学特性に関する研究

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  • Study on Dynamic Characteristics of a Post-buckled Shape Memory Alloy

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<p>Recent years, high-performance and compact vibration isolator has been demanded with the advancement of precise technology. Among various vibration isolators, a passive vibration isolator is the most commonly adopted form due to its simplicity, stability and low cost. In the previous studies, the authors have proposed a simple and compact passive vibration isolator for the vertical direction using a post-buckled shape memory alloy (SMA) beam. This isolator achieved a low natural frequency assuring high static stiffness by utilizing the negative tangent stiffness of a post-buckled SMA beam. In this study, the restoring force is investigated by the Finite Element Analysis in which the phase transformation of the post-buckled SMA was taken in account to understand deeply the relationship between negative stiffness and phase transformation. The results show that the phase transformation from austenite phase to martensite phase and reversible transformation is associated to the appearance of negative stiffness. Also, in the restoring force of a SMA beam subjected to reciprocating motion in its post-buckled state was analyzed. As the result, it was found that the restoring force converged to a certain force when SMA was subjected to reciprocating motion<tt>．</tt>In future research, It is necessary to investigate dynamic mechanical characteristic and validate the performance of the isolator taking in account the phase transformation.</p>

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