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1992 Fiscal Year Final Research Report Summary

Study on Fatigue Properties of Shape Memory Alloys

Research Project

Project/Area Number 03650568
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionInstitute of Materials Science, University of Tsukuba

Principal Investigator

MIYAZAKI Shuichi  Univ.of Tsukuba, Associate Professor, 物質工学系, 助教授 (50133038)

Co-Investigator(Kenkyū-buntansha) OTSUKA Kazuhiro  Univ.of Tsukuba, Professor, 物質工学系, 教授 (50029881)
Project Period (FY) 1991 – 1992
KeywordsTi-Ni / Ni-Ti / Shape memory alloy / Shape memory effect / Superelasticity / Fatigue / Fatigue crack / Fatigue life
Research Abstract

Fatigue tests have been made in order to investigate the fatigue life, fatigue crack nucleation and fatigue crack propagation in Ti-Ni shape memory alloys. The following results were obtained.
(1) The data of fatigue lives can be expressed by two lines, the slope of the line in the shorter life region being steeper than that in the longer life region. The former line expresses the fatigue life under cyclic superelastic deformation, while the latter line that under cyclic elastic deformation.
(2) The fatigue life was almost the same irrespective of melting method.
(3) Fatigue crack uncleated at TiC inclusions in specimens which were made by high frequency induction melting, while they nucleated along grain boundaries in specimens which were made by electron beam melting.
(4) Fatigue crack propagation rate increases with increasing test temperature in a temperature range between Ms and Td; above Td the stress-induced transformation does not occur or the critical stress for inducing martensites is too high to relax the stress concentration at a crack tip effectively.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 宮崎 修一: "機能性材料の疲労-形状記憶合金" 材料.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中 喜久昭,戸状 壽昭,宮崎 修一: "形状記憶合金の機械的性質" 養賢堂, (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Miyazaki et al.: "Fatigue Life of Ti-Ni Shape Memory Alloys"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Miyazaki et al.: "Fatigue Crack Nucleation in Ti-Ni Alloys"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Miyazaki et al.: "Fatigue Crack Propagation in Ti-Ni Alloys"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Miyazaki: "Fatigue of Shape Memory Alloys"

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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