Fatigue study and durability improvement of piezoelectric single crystal macro-fiber composite energy harvester

Jongmoon Jang, Geon Tae Hwang, Yuho Min, Jong Woo Kim, Cheol Woo Ahn, Jong Jin Choi, Byung Dong Hahn, Joon Hwan Choi, Dong Soo Park, Yongsuk Jung, Woon Ha Yoon

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In the energy harvester, the fatigue caused by cyclic vibration is an important challenge affecting 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-fiber 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 identified after 5 × 106 cycles. To improve the issue, the stress distribution on the top electrode line was analyzed by finite element analysis and the reinforced structure was proposed by attaching a 50 µm-thick polyimide film. The reinforced PEH shows the durable output power until 107 fatigue cycles without a significant output power loss. These study potentially can be applied to the development of reliable SFC-based PEH with long-term lifetime.

Original languageEnglish
Pages (from-to)645-650
Number of pages6
JournalJournal of the Korean Ceramic Society
Volume57
Issue number6
DOIs
StatePublished - Nov 2020

Keywords

  • Durability
  • Energy harvesting
  • Fatigue behavior
  • Piezoelectric
  • Single crystal macro-fiber composite

Fingerprint

Dive into the research topics of 'Fatigue study and durability improvement of piezoelectric single crystal macro-fiber composite energy harvester'. Together they form a unique fingerprint.

Cite this