Fatigue of pseudoelastic NiTi within the stress-induced transformation regime: a modified Coffin-Manson approach

Strain controlled fatigue tests of a pseudoelastic nickel-titanium (NiTi) shape memory alloy (SMA) have been carried out in this investigation. In particular, flat dog-bone shaped specimens, obtained from commercial NiTi sheets, have been analyzed, under pull-pull loading conditions, in two subseque...

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Bibliographic Details
Published in:Smart materials and structures 2012-11, Vol.21 (11), p.112001-1-7
Main Authors: Maletta, C, Sgambitterra, E, Furgiuele, F, Casati, R, Tuissi, A
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue failure
Fatigue life
Fatigue, brittleness, fracture, and cracks
Intermetallics
Martensitic transformations
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Nickel base alloys
Nickel compounds
Nickel titanides
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Shape memory alloys
Titanium compounds
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Summary:Strain controlled fatigue tests of a pseudoelastic nickel-titanium (NiTi) shape memory alloy (SMA) have been carried out in this investigation. In particular, flat dog-bone shaped specimens, obtained from commercial NiTi sheets, have been analyzed, under pull-pull loading conditions, in two subsequent steps: (i) material stabilization and (ii) fatigue life estimation. The first step was carried out to obtain a stable pseudoelastic response of the SMA, i.e. with no residual deformations upon unloading, and it can be regarded as a preliminary processing condition of the alloy. Results on functional fatigue, i.e. in terms of stabilized pseudoelastic response, and on structural fatigue, in terms of cycles to failure, are reported and discussed. Furthermore, a modified Coffin-Manson approach for fatigue life estimation of SMAs is proposed, which takes into account the strain mechanisms involved during repeated stress-induced martensitic transformations.
ISSN:0964-1726
1361-665X
DOI:10.1088/0964-1726/21/11/112001