Thermal Actuation Capabilities of the SiC Continuous Fiber/Aluminum Active Composites

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This paper presents the thermal actuation capabilities of the SiC continuous fiber/aluminum active composite plates fabricated by laminating a unidirectional fiber-reinforced layer and an unreinforced one. In this study, the effects of the fiber spacing and the number of thermal cycles on the curvature change of the composite during the thermal cycles between room temperature and 712 K up to three times were examined, and it was found that the curvature changes during the thermal cycles become almost repeatable after a couple of cycles, but the curvatures slightly increase with increasing the number of thermal cycles. It was also found that the room temperature curvatures can be maximized by the optimized heat treatment at 833 K, and the maximized one becomes repeatable even after the thermal cycle up to the higher temperature of 833 K. Therefore, the optimally heat treated composite can be used as a stabilized thermal actuator. As the maximized room temperature curvature can be recovered by the same optimum heat treatment even after a severe plastic deformation, this remarkable shape recovering capability of the active composite can be regarded as a newly developed function.
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