Control of fatigue crack propagation in the TiNi shape memory fiber reinforced smart composite

Akira Shimamoto, Yasubumi Furuya, Hiroyuki Abe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper describes the shape memory effect of TiNi fiber reinforccd/epoxy matrix smart composite on enhancement of its mechanical properties, especially fatigue resistance. Fatigue crack propagation behaviors are investigated by using the originally developed method of fine-grid which was engraved on the epoxy resin surface by photo-etching. The effects of pre-strain value in TiNi fiber on fatigue crack propagation and then, the decreasing crack propagation behavior in the very- local domain region around the embedded TiNi fiber are investigated in detail by using fine-grid-method. The retardation of fatigue crack propagation is attributed mainly to the compressive stress field in the matrix due to shrinkage of the prestraincd TiNi fibers above A, temperature. The local crack-retardation at the interface region very near the TiNi fiber is experimentally confirmed by the change of local crack-tip strain behavior. From crack-tip strain hysteresis in one load cycle, the compressive stress induced in the matrix and following fatigue crack closure phenomena play a key role to suppress the crack-tip stress intensity and these fatigue crack propagation retardations. The comparison between the theoretical prediction and experimental results also is discussed.

Original languageEnglish
Pages (from-to)1782-1789
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume67
Issue number663
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Crack closure
  • Fatigue crack
  • K'-value
  • Shape memory alloy
  • Smart composite

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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