Functional fatigue in NiTi shape memory alloy wires - A comparative study

Saikrishna, CN and Ramaiah, KV and Bhaumik, SK and Vidyashankar, B (2012) Functional fatigue in NiTi shape memory alloy wires - A comparative study. In: National Conference on Smart Materials Structures and Systems, 21-22, Coimbatore.

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    Abstract

    The functional fatigue behaviour of two near equi-atomic NiTi shape memory alloy wires obtained from different sources were evaluated. Results showed that though the wires had similar transformation temperatures and mechanical properties, their functional fatigue behaviour upon thermo-mechanical cycling was at variance. Under a variable stress in the range 150-450 MPa and 4% recovery strain, one of the wires showed better stability, and significantly higher fatigue life (~30,000 cycles) than the other (~3,500 cycles). The reasons for such wide variation in thermo-mechanical fatigue behaviour have been discussed in this paper.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Shape memory alloy; NiTi wire; Thermo-mechanical cycling; functional fatigue
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Other
    Depositing User: Ms Indrani V
    Date Deposited: 08 Jan 2014 14:05
    Last Modified: 08 Jan 2014 14:05
    URI: http://nal-ir.nal.res.in/id/eprint/11897

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