Analysis of stress distribution in flexible piezoelectric energy harvester

Hyun Cheol Song, Chong Yun Kang, Seok Jin Yoon, Dae Yong Jeong

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Wireless sensor nodes self-powering from an ambient energy source have been widely studied. In particular, the piezoelectric energy harvesting has been the focus of attention, due to its high energy density. For the piezoelectric energy harvesting, a cantilever beam structure has normally been used because of its high efficiency. Since the frequency of environmental vibrations is of the order of hundreds of Hz, which is far below the natural frequency of cantilever type ceramic actuators, the frequency of the cantilever has commonly been adjusted by placing a heavy mass on its end. In order to lower its natural frequency and increase its safety factor, we fabricated a flexible piezoelectric cantilever, which was composed of ceramic on a flexible substrate. However, it was observed that the flexible cantilever was always broken at a certain position. This result indicates that the stress was not homogeneous, and concentrated at the breakage point of the ceramic. To analyze the failure of the ceramic, we measured the inhomogeneous stress distribution on the flexible piezoelectric energy harvester and analyzed it using the ATILA program.

Original languageEnglish
Pages (from-to)1074-1077
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume117
Issue number1370
DOIs
Publication statusPublished - 2009 Oct
Externally publishedYes

Keywords

  • Cantilever
  • Flexible energy harvester
  • Piezoelectric energy harvesting
  • Stress distribution

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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