Superelastic Behavior under Cyclic Loading for Coil Spring of Ti-Ni Shape Memory Alloy

• Sakuma Toshio

  Department of Human Welfare Engineering and Assistive Technology, Oita University

• Suzuki Akihiko

  Division of Mechanical Engineering and Science, Graduate School of Science and Engineering, Saitama University

Abstract

The superelastic behavior of coil springs of a Ti-Ni shape memory alloy was investigated using loading-unloading cycling tests under isothemal temperatures. The effects of the Ni content and shape memory treatment temperatures on the cyclic behavior in the superelastic deformation were investigated. The deformation behavior within the elastic region of the parent phase scarcely changes during tensile cyclic loading. However, when a martensitic phase is induced by the stress, the deformation behavior changes considerably during cyclic loading. The critical shear stress for inducing martensites and the dissipated strain energy per cycle decrease with an increase in the number of cyclic loadings. Such changes in the superelastic behavior under cyclic loading become large with a decrease in the Ni content of the Ti-Ni shape memory alloy and the increase in the shape memory treatment temperature.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (3), 422-427, 2007

  The Japan Institute of Metals and Materials

Keywords

• shape memory alloy
• titanium-nickel alloy
• coil spring
• superelastic behavior
• temperature of heat treatment for shape memory
• nickel content

Details

• CRID: 1390001204251305472
• NII Article ID: 130004453481
• NII Article ID: 10018734707
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.48.422
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 8670936
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8670936
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/3/48_MH200612/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed