Metal Core Piezoelectric Complex Fiber and Application for Smart System
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Metal Core Piezoelectric Complex Fiber and Application for Smart System Hiroshi Sato1, Kiyoshi Takagi1, Lihua Yu1 and Masaru Nagamine2 1 Integration Process Technology Group, Advanced Manufacturing Research Institute, National Institute of Advance Industrial Science and Technology(AIST) 2 NAGAMINE MANUFACTURING Co., Ltd. ABSTRACT We produced a new metal-core piezoelectric fiber by means of both hydrothermal and extrusion methods. The insertion of a metal core was significant in view of its strength—greater than that of ceramic materials—and in that electrodes are not required in the fiber’s sensor and actuator applications. A new smart board was designed by mounting these piezoelectric fibers on the surface of a CFRP composite, and the sensor and the actuator function were evaluated. We showed that self-sensing was possible using this smart board. And function as a sensor and actuator, this board can control the vibration. Introduction Piezoelectric material can be used in sensing and actuating applications. Much attention has recently been paid to the application of piezoelectric materials in smart structures such as health monitoring devices and for vibration control by embedding them into composite materials such as Carbon-fiber Reinforced Plastic (CFRP) and Grass-fiber Reinforced Plastic (GFRP). In embedding piezoelectric materials into composite material, it is essential to minimize the inclusion effect on the mechanical performance of the composite. As one solution, the Active Materials and Structures Laboratory at MIT has proposed the use of fiber-shaped piezoelectric material(AFC) [1][2]. In their research, thin PZT fibers are transversely aligned in a polymer matrix and the fiber laminates are put between interdigital electrodes(IDT) at a right angle in order to obtain a larger d33 mode strain along the fiber axis. However, their fiber has disadvantages, as only IDT can be used as sensors and actuators in this application and the fragility of ceramics may be problematic. In order to solve these problems, we propose the use of a piezoelectric fiber having a metal core, which is fabricated by means of the hydrothermal method. Our piezoelectric fiber has the following advantages: (1)No need of electrodes. (2)High Performance. (3) Durability (4)High resistance to external noise (5) Low cost[3]. In this paper, we describe the fabrication of piezoelectric fibers with metal cores using two techniques — the hydrothermal method and the extrusion method, as well as the design of a CFRP smart board using these piezoelectric fibers[4]. In addition, we show that this smart board has the capability to act as both a sensor and an actuator. Using a sensor and actuator function, this board can be able to know own state, and to suppress own vibration. Metal Core-Piezoelectric Fiber Embedding a sensor and an actuator in the composite structure enables health-monitoring and vibration-suppression functions to be performed. However, it is necessary to consider the shapes of the sensor and the actuator to minimize
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