In this paper, epoxy matrix composite beams with embedded TiNi (SMA: Shape Memory Alloy) fiber are applied to enhance the strength and fracture toughness of the machinery components. It is also well known that SMA shows the remarkable changes of stiffness and damping ratio between martensite at lower temperature and austenite at high temperature. A shape recovery force is associated with inverse phase transformation of SMA. The effects of heating with current and pre-strain in TiNi fiber of SMA on vibration characteristics are experimentally investigated. The active vibration control is achieved by controlling the current and pre-strain.

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We clarified experimentally electrical and mechanical pruperties of SMA ( Shape MeIuory Alloy ) in diameter O． 2mm and SMP ( Shape Memory Pulymer ) in thickness 1． 工 5 mm ，正 n addition ， SMC ( Shape Mcmory Composite )composed of these SMA and SMP ， was also investigated to clarify the e 】 ectrical 且 nd mcchanical properties required to actuators ． 鍬工 aill results ohtained ill this study are as follows ； (1 )When SMA was heated elect ． rically over Q． 4A ， recovery time until the origina ］ 且 gure wasunder 5 s 巳¢ onds ．(2 ＞Wheu SMC was heated elec 亡 rically over O ． 3A ， the surface tcmpera 一 し ure of SMC re 且 ched approximatcly Tu after 120 seconds

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