板状Ti-Ni形状記憶合金素子の座屈後特性におよぼす材料厚さの影響

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  • Effects of material thickness on mechanical properties of plate-shaped Ti-Ni shape memory alloy during post-buckling deformation

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<p>The straight-shaped Ti-Ni shape memory alloy (SMA) element shows negative stiffness during post-buckling deformation, and the deformation is recovered by the removing of external force (super-elastic effect). Negative stiffness is applied to the vibration-free system using zero-stiffness structure. We devised and fabricated the vibration-free system using the negative stiffness of tape-shaped SMA element, and the vibration characteristic of this system was investigated. As the results, this vibration-free system shows the excellent vibration characteristic. However, the post-buckling behavior of SMA is varied by the variation of fabrication condition, use conditions and the dimension of SMA element. In previous studies, it is cleared that the stiffness of SMA element during post-buckling deformation is affected by the Yung’s modulus of Austenitic-phase and Martensitic-phase. In this study, effects of material thickness on the buckling properties of SMA element are investigated by finite element method (FEM) analyses. The negative tangential stiffness of SMA element during post-buckling deformation increases with increase of the thickness of SMA element. Furthermore, the decreasing of volume faction of Martensitic-phase during buckling deformation leads to the increase of negative tangential stiffness of SMA element during post-buckling deformation. From these results, it is thought that the increase of negative tangential stiffness of SMA element during post-buckling deformation is due to the decrease of volume faction of Martensitic-phase during buckling deformation.</p>

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