A comparison study of fatigue behavior of hard and soft piezoelectric single crystal macro-fiber composites for vibration energy harvesting

Mahesh Peddigari, Ga Yeon Kim, Chan Hee Park, Yuho Min, Jong Woo Kim, Cheol Woo Ahn, Jong Jin Choi, Byung Dong Hahn, Joon Hwan Choi, Dong Soo Park, Jae Keun Hong, Jong Taek Yeom, Kwi Il Park, Dae Yong Jeong, Woon Ha Yoon, Jungho Ryu, Geon Tae Hwang

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Designing a piezoelectric energy harvester (PEH) with high power density and high fatigue resistance is essential for the successful replacement of the currently using batteries in structural health monitoring (SHM) systems. Among the various designs, the PEH comprising of a cantilever structure as a passive layer and piezoelectric single crystal-based fiber composites (SFC) as an active layer showed excellent performance due to its high electromechanical properties and dynamic flexibilities that are suitable for low frequency vibrations. In the present study, an effort was made to investigate the reliable performance of hard and soft SFC based PEHs. The base acceleration of both PEHs is held at 7 m/s² and the frequency of excitation is tuned to their resonant frequency (ƒr) and then the output power (Prms) is monitored for 107 fatigue cycles. The effect of fatigue cycles on the output voltage, vibration displacement, dielectric, and ferroelectric properties of PEHs was analyzed. It was noticed that fatigue-induced performance degradation is more prominent in soft SFC-based PEH (SS-PEH) than in hard SFC-based PEH (HS-PEH). The HS-PEH showed a slight degradation in the output power due to a shift in ƒr, however, no degradation in the maximum power was noticed, in fact, dielectric and ferroelectric properties were improved even after 107 vibration cycles. In this context, the present study provides a pathway to consider the fatigue life of piezoelectric material for the designing of PEH to be used at resonant conditions for long-term operation.

Original languageEnglish
Article number2196
JournalSensors
Volume19
Issue number9
DOIs
StatePublished - 1 May 2019

Keywords

  • Energy harvesting
  • Long-term stability
  • Piezoelectric single crystal

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