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In situ Observation of NiTi Transformation Behaviour: A Micro–Macro Approach

  • Kasun S. Wickramasinghe
  • Rachel A. TomlinsonEmail author
  • Jem A. Rongong
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

A novel experimental investigation is presented of thermally and stress induced transformation behaviour of a Polycrystalline NiTi Shape Memory Alloy (SMA) plate for flexural-type applications: In situ techniques are employed to allow simultaneous macroscopic and microstructural observation of the SMA in a 4-point flexural test. Forming part of a wider research towards realising a NiTi SMA Variable Stator Vane assembly for the gas turbine engine, the study explores variables critical to flexural-type morphing NiTi structures: (1) temperature; (2) strain; and (3) cyclic loading. It builds a relationship between the macro and micro response of the SMA under these key variables and lends critical implications for the future understanding and modelling of shape memory alloy behaviour for all morphing applications. This paper presents the methodological aspects of this study.

Keywords

Shape memory NiTi In situ Phase transformations Micro–macro approach Cyclic loading 

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Copyright information

© The Society for Experimental Mechanics, Inc. 2015

Authors and Affiliations

  • Kasun S. Wickramasinghe
    • 1
  • Rachel A. Tomlinson
    • 1
    Email author
  • Jem A. Rongong
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of SheffieldSheffieldUK

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