Thermo-mechanically coupled superelastic response of initially-textured Ti-Ni sheet

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A three-dimensional crystal-mechanics based model for the thermo-mechanically coupled superelastic response of initially-textured polycrystalline shape-memory materials is used to simulate the response of Ti-Ni shape-memory alloy in sheet form. Both manifestations of superelasticity: stress-strain response at a fixed temperature, and strain-temperature response at a fixed stress have been experimentally studied. The model, when suitably numerically implemented and calibrated, is shown to accurately predict the anisotropic superelastic response of tension specimens which were cut along different directions to the rolling direction of the sheet. Also, the strain-temperature cycling experiments under different constant axial stresses are predicted with reasonable accuracy. The effects of self-heating and cooling due to the exothermic and endothermic nature of the austenite-to-martensite and martensite-to-austenite transformations were investigated by performing superelastic tension experiments at strain rates which are high enough to result in non-isothermal testing conditions. The thermo-mechanically coupled theory is able to capture the resulting inhomogenous deformation associated with the nucleation and propagation of transformation fronts, and also the 'apparent hardening' of the nominal stress-strain curves observed in the experiments.

Original languageEnglish
Pages (from-to)325-338
Number of pages14
JournalActa Materialia
Volume51
Issue number2
DOIs
Publication statusPublished - 22 Jan 2003
Externally publishedYes

Fingerprint

Shape memory effect
Martensite
Austenite
Experiments
Stress-strain curves
Temperature
Hardening
Strain rate
Mechanics
Nucleation
Cooling
Heating
Crystals
Testing
titanium nickelide
Direction compound

Keywords

  • Crystal mechanics
  • Finite elements
  • Shape-memory
  • Thermo-mechanical testing

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys

Cite this

Thermo-mechanically coupled superelastic response of initially-textured Ti-Ni sheet. / G. Thamburaja, T Prakash; Anand, L.

In: Acta Materialia, Vol. 51, No. 2, 22.01.2003, p. 325-338.

Research output: Contribution to journalArticle

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