Experimental characterisation of three-phase NiTi wires under tension

Helbert, Guillaume; Saint‐Sulpice, Luc; Chirani, Shabnam Arbab; Dieng, Lamine; Lecompte, T.; Calloch, Sylvain; Pilvin, Philippe

doi:10.1016/j.mechmat.2014.07.020

Cited by 37 publications

(30 citation statements)

References 39 publications

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“…In contrast to the experiment, transformation to martensite with very low transformation strain occurs in the simulation. It is known that the presence of R-phase suppresses thermally induced martensite transformation at low stress (Helbert et al, 2014; Olbricht et al, 2011). However, this is not covered by the model yet.…”

Section: Resultsmentioning

confidence: 99%

“…It will be demonstrated that such a type of loading leads to a dynamic redistribution of stress and phase composition within the material. In NiTi-based alloys, all following experimentally observed phenomena can come into the play: the coupled influence of stress and temperature on phase transformations and temperature-dependent reorientation stress (Helbert et al, 2014; Olbricht et al, 2011; Urbina et al, 2009), substantially different elastic properties of austenite, R-phase and martensite (Šittner et al, 2006), anisotropy of elastic properties of martensite (Qiu et al, 2011; Šittner et al, 2014), asymmetry and (texture-induced) anisotropy of transformation strain (Gall et al, 1999; Mao et al, 2010; Šittner et al, 2009), etc. Because of the high level of complexity of resulting models and difficulties with obtaining a complete set of physical parameters, these phenomena are rarely taken into consideration jointly and simultaneously in SMA constitutive models, even though the material response may be very sensitive to their interplay.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: a case study on helical spring actuator

Frost

Sedlák

Kadeřávek

et al. 2016

Journal of Intelligent Material Systems and Structures

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Textured polycrystals of NiTi-based shape memory alloys (SMA) exhibit pronounced anisotropic properties which significantly influence their response to mechanical and thermal loading. In this work, a constitutive model tailored for non-proportional multi-axial loading of NiTi SMA exhibiting two-stage phase transformation via R-phase is enhanced so that the anisotropy of martensitic structure is captured. Numerical simulations of the mechanical response of a NiTi SMA helical spring subjected to thermal cycling at a constant applied force are performed and compared with experimental data. Quantitative correspondence between experiments and simulations demonstrates the predictive potential of the model. Simulations also provide detailed information on the evolution of distributions of phase fractions and stress within a cross-section of the wire forming the spring. Because the loading is non-proportional, the evolution is rather complex and intriguing.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: a case study on helical spring actuator

Frost

Sedlák

Kadeřávek

et al. 2016

Journal of Intelligent Material Systems and Structures

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“…One of the limitations in the engineering application of the NiTi SMA is the degradation of the mechanical properties when subjected to cyclic loading. In fact, after loading and unloading, the martensite variants become wider in the plateau of martensite transformation, and the dislocation density increases [13,14]. As a consequence, the residual stain at zero stress becomes more important and the hysteresis loop area of loading and unloading decreases.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, the residual stain at zero stress becomes more important and the hysteresis loop area of loading and unloading decreases. G. Helbert et al [13], indicated that after a few number of cycles, the NiTi alloy would reach stabilization in the residual strain and the maximal dissipation capacity. However, Dayananda et al [15] showed that the dissipated energy went down with the rise in the number of cycles, and this energy increases with the growing number of cycles.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

Sarraj

Kessentini

Hassine

et al. 2019

Metals

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In this work, we are interested in examining the strain rate effect on the mechanical behavior of Ni–Ti superelastic wires after hydrogen charging and ageing for 24 h. Specimens underwent 50 cycles of loading-unloading, reaching an imposed deformation of 7.6%. During loading, strain rates from 10−4 s−1 to 10−2 s−1 were achieved. With a strain rate of 10−2 s−1, the specimens were charged by hydrogen for 6 h and aged for one day showed a superelastic behavior marked by an increase in the residual deformation as a function of the number of cycles. In contrast, after a few number of cycles with a strain rate of 10−4 s−1, the Ni-Ti alloy archwire specimens fractured in a brittle manner during the martensite transformation stage. The thermal desorption analysis showed that, for immersed specimens, the desorption peak of hydrogen appeared at 320 °C. However, after annealing the charged specimens by hydrogen at 400 °C for 1 h, an embrittlement took place at the last cycles for the lower strain rates of 10−4 s−1. The present study suggests that the embrittlement can be due to the development of an internal stress in the subsurface of the parent phase during hydrogen charging and due to the creation of cracks and local zones of plasticity after desorption.

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“…Indeed, it is necessary to characterize the material behaviour under the same conditions as faced by the damper devices in service. Thus, strain rate effects in SMA have been widely investigated and explain non-monotoneous damping capacity changes with imposed frequency (see Fan et al, 2019; He et al, 2010; Helbert et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

On the understanding of damping capacity in SMA: From the material thermomechanical behaviour to the structure response

Helbert

Volkov

Evard

et al. 2020

Journal of Intelligent Material Systems and Structures

Self Cite

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Superelastic Shape Memory Alloys (SMAs) provide a high damping capacity due to the hysteretic motion of the inter-phase boundaries during the martensitic transformation. They have demonstrated their ability to control vibrations of SMA-based Civil Engineering and Aerospace structures. In order to improve existing damping devices, characterization of SMA damping capacity is necessary, despite the lack of a standard procedure. Classical characterizations such as tensile or torsion tests on SMA samples are very attractive, the fact that they are common and simple to process. Furthermore, environment and loading conditions are quite easy to control. Different energy-based formulations have been proposed in the literature to explicitly predict SMA damping capacity from the hysteretic mechanical behaviour. The aim of this paper is to classify commonly used formulations from the literature, using a new thermomechanical vibration numerical model of a SMA beam structure. Thus, three energy-based predictions of SMA intrinsic damping ratio measured at the material scale are compared to the damping ratio measured from the free vibration signal at the SMA beam structure scale, taken as the objective reference. The formulation proposed by Piedbœuf and Gauvin provided a better match in three study-cases.

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Experimental characterisation of three-phase NiTi wires under tension

Cited by 37 publications

References 39 publications

Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: a case study on helical spring actuator

Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: a case study on helical spring actuator

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

On the understanding of damping capacity in SMA: From the material thermomechanical behaviour to the structure response

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