Thermomechanical modelling of a NiTi SMA sample submitted to displacement-controlled tensile test

Depriester, Dorian; Maynadier, Anne; Lavernhe-Taillard, Karine; Hubert, Olivier

doi:10.1016/j.ijsolstr.2014.01.027

Cited by 25 publications

(20 citation statements)

References 27 publications

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“…This characterization procedure includes tensile tests at different strain rates in order to determine the maximum temperature change of the SMA under adiabatic conditions [27,29]. Furthermore, the characterization includes the investigation of local temperature peaks which appear during the stressinduced phase transformation [21,24,32,33], whereas a homogenous temperature distribution is required for an efficient heat transfer during the cooling process. The homogeneity of the temperature distribution shows a strong rate dependency [24,28,34]; in order to optimize the heat transfer, the mean temperature change of the elastocaloric sample has to show a maximum [27].…”

Section: Materials Stabilization During Elastocaloric Mechanical Trainmentioning

confidence: 99%

Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Schmidt

Ullrich

Wieczorek

et al. 2015

Shap. Mem. Superelasticity

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The paper presents novel findings observed during the training process of superelastic, elastocalorically optimized Ni-Ti-based shape memory alloys (SMA). NiTiCuV alloys exhibit large latent heats and a small mechanical hysteresis, which may potentially lead to the development of efficient solid-state-based cooling processes. The paper starts with a brief introduction to the underlying principles of elastocaloric cooling, illustrating the effect by means of a typical thermodynamic cycle. It proceeds with the description of a custom-built testing platform that allows observation of temperature profiles and heat transfer between SMA and heat source/sink during high-loading-rate tensile tests. Similar to other SMA applications, a training process is necessary in order to guarantee stable performance. This well-known mechanical stabilization affects the stress-strain hysteresis and the cycle-dependent evolution of differential scanning calorimetry results. In addition, it can be shown here that the training is also accompanied by a cycle-dependent evolution of temperature profiles on the surface of an SMA ribbon. The applied training leads to local temperature peaks with intensity, number, and distribution of the temperature fronts showing a cycle dependency. The homogeneity of the elastocaloric effect has a significant influence on the efficiency of elastocaloric cooling process and is a key aspect of the specific material characterization.

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Section: Materials Stabilization During Elastocaloric Mechanical Trainmentioning

confidence: 99%

Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Schmidt

Ullrich

Wieczorek

et al. 2015

Shap. Mem. Superelasticity

View full text Add to dashboard Cite

show abstract

“…2(D)). The rate dependent quantity of transformation bands was investigated by (Pieczyska et al, 2006), and (Depriester et al, 2014) and has a significant influence on the performance of the cooling system. The number of phase fronts and the related quantity of temperature peaks increase with increasing strain rate.…”

Section: Discussionmentioning

confidence: 99%

Scientific test setup for investigation of shape memory alloy based elastocaloric cooling processes

Schmidt

Schütze

Seelecke

2015

International Journal of Refrigeration

163

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“…The effects of temperature, giving a ''(Lüders) band-like'' structure of transformation in NiTi, are considered in [79].…”

Section: The Phenomenological Approachmentioning

confidence: 99%

Shape memory alloys as an effective tool to damp oscillations

Torra¹,

Isalgué

Lovey

et al. 2015

J Therm Anal Calorim

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The SMA was studied for their macroscopic application in damping for civil engineering. The study is a synthesis and includes an outline of the models required for the SMA simulation and some case studies using the finite element analysis methods. This work is an overview that focuses in the mitigation of the oscillations in structures induced by earthquakes, and for a reduction of the oscillations amplitude in stayed cables under the action of rain, wind or traffic. The analysis needs the required conditions for each application determining the working conditions. The study includes the number of working cycles, the temperature effects and the cooling actions and, for instance, the action of the cycling frequency. The main target relates the appropriateness of the SMA for each purpose, and the suitability of the SMA device is always experimentally guaranteed. Furthermore, the applicability of the obtained results for SMA and the practical behavior of the SMA dampers were studied in international facilities. The paper includes appropriate suggestions for a correct preparation of the SMA dampers. This work outlines the effects of stress and temperature aging in NiTi, describes the particular structural effects between 18R and 6R, introduces a first attempt in the dynamic properties of the CuAlBe single crystals and summarizes some recent suggestions for damping using SMA.Keywords Shape memory alloys Á Martensitic transformation Á NiTi Á CuAlBe Á Damping Á Fatigue Part oneThe martensitic transformation (MT) is the origin of the unique properties of shape memory alloys (SMA) [1,2]. MT is a first-order phase transition between metastable phases with hysteresis. The transformation takes place with small displacements of the atoms and without any change in the positions of the neighboring atoms: Atomic order is conserved in the transformation. The transformation can be induced by temperature or by external forces, such as traction or compression. In temperature-induced transformations, M s (martensite start) denotes the starting temperature. The M f (martensite finish) temperature determines the end of the transformation, and A s and A f denote the austenite start and the austenite finish temperatures, respectively. This part was devoted to general contents and properties of the SMA appropriate for damping of oscillations. In particular, reduction of oscillations appeared in civil engineering structures.

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Thermomechanical modelling of a NiTi SMA sample submitted to displacement-controlled tensile test

Cited by 25 publications

References 27 publications

Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Scientific test setup for investigation of shape memory alloy based elastocaloric cooling processes

Shape memory alloys as an effective tool to damp oscillations

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