Fabrication and vibration characterization of electrically triggered shape memory polymer beams |
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| Institution: | 1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China;2. Institute of Rheological Mechanics, Xiangtan University, Xiangtan 411105, China;1. Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai 200240, China;2. The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;3. Department of Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands;4. Department of Metallurgical Engineering, Anhui University of Technology, Ma''anshan 243002, China;5. Institute of Ferrous Metallurgy, Northeastern University, Shenyang 110819, China;1. Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry, and Science, College of Textiles, North Carolina State University, Raleigh, NC 27695, USA;2. Statistics Ph.D. Program, Department of Statistics, College of Sciences, Raleigh, NC 27695, USA;3. Textile Chemistry Program, Department of Textile Engineering, Chemistry and Science, College of Textiles, North Carolina State University, Raleigh, NC 27606, USA;1. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Institute of Research and Development, Duy Tan University, Da Nang, Viet Nam;4. Department of Environmental Energy & Engineering, Kyonggi University, Suwon 442-760, South Korea;5. Faculty of Chemistry, Hanoi University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 10000 Viet Nam;6. Vietnam Academy of Science and Technology, Ha Noi, Viet Nam;7. Department of Polymer Science and Engineering, Inha University, Incheon 22212, South Korea;1. R&D Department, Dainese S.p.A., 36060 Molvena, Italy;2. Department of Industrial Engineering, University of Padova, 35131 Padova, Italy |
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| Abstract: | Shape memory polymers (SMP) exhibit temperature, frequency and strain rate dependent properties which may be manipulated by various types of external stimuli to achieve desirable response characteristics. In recent years, the emphasis has been on designing SMPs which do not require external stimuli (such as a heat source) and have a rapid response time with large homogenous and reversible deformation characteristics. In this research, the fabrication process and dynamic vibration testing of an electrically activated SMP are presented. It is shown that conductive SMP beams can be fabricated to achieve tunable stiffness and damping with a reasonable thermal gradient generated by electrical triggering. This can allow the tuning of a range of frequency bandwidth and damping properties of SMPs for vibration control applications. The experimentation yielded modal properties (natural frequencies and damping) of the SMP beams. These parameters were validated against values obtained from the estimated performance of these beams based on the complex modulus parameters obtained using dynamic mechanical analysis (DMA). For a modest 20 °C temperature range in an epoxy based SMP, a resulting shift of approximately 7% in the natural frequency and 100% change in the damping ratio of a rectangular beam was successfully attained. These results recommend SMPs as being tunable materials that can enhance vibrational performance and expand the operational envelope of structures. |
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| Keywords: | Shape-memory polymer Electrically triggered Beams Vibration Natural frequency Damping |
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