| Fatigue study and durability improvement of piezoelectric single crystal macro-fi ber composite energy harvester |
| Jongmoon Jang1, Geon-Tae Hwang1, Yuho Min1, Jong-Woo Kim1, Cheol-Woo Ahn1, Jong-Jin Choi1, Byung-Dong Hahn1, Joon-Hwan Choi1, Dong-Soo Park1, Yongsuk Jung2, Woon-Ha Yoon1 |
1Laboratory for Functional Ceramics, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
2Optics-Sensor Team, Hanwha Systems Co., Ltd, Seongnam 13524, South Korea |
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Received: March 23, 2020; Revised: May 19, 2020 Accepted: May 21, 2020. Published online: November 30, 2020. |
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| ABSTRACT |
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In the energy harvester, the fatigue caused by cyclic vibration is an important challenge aff ecting the lifetime of the device. The aim of this study is to evaluate the fatigue behavior of the cantilever-type piezoelectric energy harvester (PEH) based on a single crystal macro-fi ber composite (SFC), and propose a method for improving durability. The initial output of the fabricated PEH shows 6 mW root mean square power at 0.5 gravitational acceleration at resonance frequency (23 Hz). In fatigue test under cyclic vibration, the dramatic power decrease and waveform distortion caused by the mechanical crack at the top electrode line were identifi ed after 5 × 106 cycles. To improve the issue, the stress distribution on the top electrode line was analyzed by fi nite element analysis and the reinforced structure was proposed by attaching a 50 μm-thick polyimide fi lm. The reinforced PEH shows the durable output power until 107 fatigue cycles without a signifi cant output power loss. These study potentially can be applied to the development of reliable SFC-based PEH with long-term lifetime. |
| Key words:
Piezoelectric · Energy harvesting · Single crystal macro-fi ber composite · Fatigue behavior · Durability |
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