Fatigue properties of a pseudoelastic NiTi alloy: Strain ratcheting and hysteresis under cyclic tensile loading

Maletta, Carmine; Sgambitterra, Emanuele; Furgiuele, Franco; Casati, Riccardo; Tuissi, A.

doi:10.1016/j.ijfatigue.2014.03.011

Cited by 125 publications

(70 citation statements)

References 43 publications

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“…Classical pull-pull fatigue tests have been performed on Nitinol wires and sheets as well. Dog bone samples, cut from wire electro discharge machining, were tested in [12] in order to investigate the pull-pull fatigue behaviour of Nitinol sheets. In the case of pull-pull fatigue of Nitinol wires, most of the results in literature are from straight non-machined samples [13] [14].…”

Section: Introductionmentioning

confidence: 99%

Phase Transformations and Fatigue of NiTi

Alarcon

Heller²,

Chirani³

et al. 2015

MATEC Web of Conferences

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Abstract. Tensile fatigue of superelastic medical graded NiTi wires was analysed in stress control regime with special attention paid to the deformation/transformation processes involved. Concave shaped samples were machined from NiTi wires allowing us to confine deformation processes into the centre of the sample. The localization of phase transformations within the centre was confirmed using in-situ infrared imaging. Characteristic stress-displacement responses for amplitudes inducing either R-phase only or both R-phase and martensite were identified for these samples. A limited number of pull-pull fatigue tests in force-control regime were performed. The obtained S-N curve and associated stress-displacement responses allowed for identification of three fatigue regimes differing in the fatigue life-time by orders of magnitude. Particularly, fatigue life-time deteriorating effect of R-phase transformation was identified.

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Section: Introductionmentioning

confidence: 99%

Phase Transformations and Fatigue of NiTi

Alarcon

Heller²,

Chirani³

et al. 2015

MATEC Web of Conferences

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“…In both Fig. 5 and 6, it is possible to verify the convergence of the hysteretic loops from the first cycles to the [29][30][31], with the exception of faster gaining of the cyclic stability behavior which may be due to the compositional and previous history differences in base metal samples. Also, the weld bead shows a softening effect in the starting and finishing of the stress plateau, resulting in more elongated loops.…”

Section: Cyclic Deformation Behaviormentioning

confidence: 93%

Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires

Mirshekari

Kermanpur

Saatchi

et al. 2015

J. of Materi Eng and Perform

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The present paper reports the effects of Nd:YAG laser welding on the microstructure, phase transformation, cyclic deformation behavior, and corrosion resistance of Ti-55 wt.% Ni wire. The results showed that the laser welding altered the microstructure of the weld metal which mainly composed of columnar dendrites grown epitaxially from the fusion line. DSC results indicated that the onset of the transformation temperatures of the weld metal differed from that of the base metal. Cyclic stress-strain behavior of laserwelded NiTi wire was comparable to the as-received material; while a little reduction in the pseudo-elastic property was noted. The weld metal exhibited higher corrosion potential, lower corrosion current density, higher breakdown potential and wider passive region than the base metal. The weld metal was therefore more resistant to corrosion than the base metal.

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“…Probabilistic modeling may be a useful tool in fatigue life analysis of SMA bodies, given the scattering observed in the thermomechanical response of nearly identical test samples demonstrated in experimental works (Figueiredo et al, 2009;Nemat-Nasser and Guo, 2006). Relevant experiments (Scirè Mammano and Dragoni, 2014) Maletta et al (2012Maletta et al ( , 2014 to predict the fatigue life of NiTi SMAs under the stress-controlled cyclic loading conditions. A third…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional constitutive model for structural and functional fatigue of shape memory alloy actuators

Chemisky

Hartl

Meraghni

2018

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractA three-dimensional constitutive model is developed that describes the behavior of shape memory alloy actuators undergoing a large number of cycles leading to the development of internal damage and eventual catastrophic failure. Physical mechanisms such as transformation strain generation and recovery, transformation-induced plasticity, and fatigue damage associated with martensitic phase transformation occurring during cyclic loading are all considered within a thermodynamically consistent framework. Fatigue damage in particular is described utilizing a continuum theory of damage. The total damage growth rate has been formulated as a function of the current stress state and the rate of martensitic transformation such that the magnitude of recoverable transformation strain and the complete or partial nature of the transformation cycles impact the total cyclic life as per experimental observations. Simulation results from the model developed are compared to uniaxial actuation fatigue tests at different applied stress levels. It is shown that both lifetime and the evolution of irrecoverable strain are accurately predicted by the developed model.

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Fatigue properties of a pseudoelastic NiTi alloy: Strain ratcheting and hysteresis under cyclic tensile loading

Cited by 125 publications

References 43 publications

Phase Transformations and Fatigue of NiTi

Phase Transformations and Fatigue of NiTi

Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires

Three-dimensional constitutive model for structural and functional fatigue of shape memory alloy actuators

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