TiNi SMAファイバ強化複合材料における形状回復力の形成挙動

抄録

For utilizing SMA smart composite materials effectively it is essential to understand how shape recovery force is dynamically generated. However, the standard strain metrology for composite materials cannot accurately evaluate shape recovery force due to the thermal expansion of the matrix. For precise evaluation, electric resistance change by Joule heating and in its cooling process is emphasized in this research. Especially, significant points of electric resistance change are used as markers for the phase transformation progress of SMA. As a result, it is confirmed that there is an excellent correlation between shape recovery force and electric resistance. Measuring electric resistance change of SMA is very effective to evaluate dynamic behavior of shape recovery force of SMA in the composite materials. Using the proposed method, information regarding the shape recovery force formation of the SMA single fiber and the smart composite materials under different operation temperature is confirmed.