Stress-induced martensitic transformation of a NiTi alloy in isothermal shear, tension and compression

Orgéas, Laurent; Favier, Denis

doi:10.1016/s1359-6454(98)00167-0

Cited by 237 publications

(144 citation statements)

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“…In particular, both the critical stress for the onset of transformation and the maximal transformation strain exhibit a tension-compression asymmetry. This phenomena has been observed experimentally [2,3] on NiTi and copper-based alloys, and using a micromechanical model [4]. To design advanced devices in SMAs that are subjected to multiaxial loadings, the chosen constitutive model should include such effects.…”

Section: Introductionmentioning

confidence: 83%

“…To represent this phenomenon in the case of superelasticity, a phenomenological transformation surface was derived from Prager equation. Several authors have also proposed similar yield surface definitions [8,9,2,5]. In the constitutive model of Chemisky et al, it is assumed that amplitude of the average transformation strain tensor ε T reaches a maximum:…”

Section: Constitutive Model and Description Of Tension-compression Asmentioning

confidence: 99%

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Determination of the Characteristic Parameters of Tension-Compression Asymmetry of Shape Memory Alloys Using Full-Field Measurements

Chemisky

Echchorfi

Meraghni

et al. 2013

MSF

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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. Abstract. In this work, a method for the identification of the transformation surface of Shape Memory Alloys based on full field measurements is presented. An inverse method coupled with a gradientbased algorithm has been developed to determine the characteristic parameters of the transformation surface. The constitutive equations of the chosen model that capture the macroscopic behavior of Shape Memory Alloys are first presented. The material parameters, to be identified, that are characteristic of the tension-compression asymmetry of the alloy are detailed. The identification algorithm, based on full field measurements obtained by Digital Image Correlation (DIC) and numerical simulation by Finite Element Analysis are introduced. The identification algorithm is validated using a numerically generated strain field on a Meuwissen-type specimen.

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Section: Introductionmentioning

confidence: 83%

Section: Constitutive Model and Description Of Tension-compression Asmentioning

confidence: 99%

Determination of the Characteristic Parameters of Tension-Compression Asymmetry of Shape Memory Alloys Using Full-Field Measurements

Chemisky

Echchorfi

Meraghni

et al. 2013

MSF

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“…In that respect, tests using other stress states than tension give the opportunity to verify common assumptions, e.g., that "the stress-strain curve has a negative slope during the transformation" and that "internal hysteresis loops are explained by means of the diagonal line" [21]. It is worth noting that the observed localisation in tension can be well simulated by finite elements method assuming either a negative [22] or a slightly positive [23] slope of the true stress-strain tensile curve. With this last assumption, no localisation is predicted in compression or shear, as observed experimentally [23].…”

Section: Non-homogeneity Of the Tensile Testmentioning

confidence: 97%

“…First, a uniform temperature increase prior to the onset of the Liiders-like deformation [9] demonstrates that the transformation starts prior to the localisation. Second, this Luders-like behaviour is not observed in compression or shear tests of single-crystals or polycristalline NiTi [13][14][15][16], as shown in Figure 3(b) and Figure 5(a), or in tension-compression tests of Cu based SMAs [17][18][19], as shown in Figure 3(a). In tension tests of NiTi SMAs, this localisation is hindered when using bulk specimens [20].…”

Section: Non-homogeneity Of the Tensile Testmentioning

confidence: 99%

Stress state effect on mechanical behaviour of shape memory alloys : Experimental characterisation and modelling

Orgéas

Favier

2001

J. Phys. IV France

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Abstract. As engineering components utilising the beneficial properties of shape memory alloys (SMA) become geometrically complex and as applications involve combinations of loading states, a full evaluation of the effects of stress state on stress-strain response of these materials becomes critical for the success of these applications. Such evaluation is required to establish reliable constitutive relationship to model the complex thermomechanical behaviour of SMAs. This paper is intended to present a non-exhaustive overview on studies and results dealing with experimental characterisation and modelling of the effects of stress state on mechanical behaviour of shape memory alloys. In that respect, our presentation is mainly focused on one hand on experimental results on superelastic and ferroelastic deformation of polycrystalline alloys and on the other hand on the modelling at the macroscopic level, yielding critical reorientation or transformation constitutive equations. INTRODUCTIONShape memory alloys (SMAs) are known to exhibit a range of novel thermomechanical properties due to thermoelastic martensitic transformations. The superelasticity is a quasi-elastic deformation far beyond the conventional elastic limit of the material when deformed at certain temperature above A p the finishing temperature of the reverse martensite-to-austenite transformation. This phenomenon is associated with stress-induced martensitic (SIM) transformation. If the temperature is lowered to below M p the finishing temperature of the forward austenite-to-martensite transformation, the deformation proceeds by martensite reorientation. Martensite may deformed by reorientation forth and back with alternating stresses in opposite directions. This deformation mode is known as the ferroelasticity, in recognition of its phenomenological similarity to ferromagnetism. The one-way shape memory effect is observed when a specimen deformed by martensite reorientation reverts to its original shape upon heating to above A f Numerous experimental works have been performed in the past three decades aiming at characterising the thermo-mechanical behaviour in order to provide experimental evidences for the establishment of constitutive models. These experimental studies have been devoted to both single-crystal and polycrystal specimens, mainly using Cu-based and NiTi SMAs. Most mechanical testing has been carried out in tension using wire specimens. Less work has been done to characterise properties under other stress states. As engineering components become geometrically complex and as applications involve combinations of loading states, it becomes important to characterise material properties in different stress states. This will allow the establishment of reliable constitutive equations to model the complex thermomechanical behaviour of SMAs.The present paper is intended to give a non-exhaustive overview on the studies and results dealing with experimental characterisation and modelling of the influence of stress state on mechanical behaviour of...

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“…Experiments in tension have been performed on the NiTi alloy at 37°C and a constitutive equation has been fitted on these experimental results, as shown in Fig.8.c. The proposed constitutive equation takes into account the non-symmetric behavior observed in tensioncompression for the superelastic deformation of NiTi alloys [10]. Simulation shows that, during the expansion of the stent, the straight segments experience negligible strains and stresses, as shown in Fig.8.d.…”

Section: Influence Of the Manufacturing Process On The Transformationmentioning

confidence: 99%

Influence of manufacturing methods on the homogeneity and properties of nitinol tubular stents

Favier

Orgéas

Ferrier³

et al. 2001

J. Phys. IV France

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Abstract. Nitinol has found growing applications in vascular stents, with the recent introduction on the market of a number of new nitinol tubular devices for coronary and peripheral usage. These stents can be produced either through the expansion of a pattern cut on a small tube (pre-cut) or by cutting the deployed design on a tube of a larger size (pre-expanded) [l].The aim of the study was to analyze the differences of properties induced by the two manufacturing methods. For this purpose, Differential Scanning Calorimetry (DSC) measurements were performed on various specimens from the two types of stents. A first set of measurements shows that pre-expanded stents exhibit usual A<-»R<->M transformations whereas multi-stage transformations occur for pre-cut stents. Two types of DSC specimens were then prepared for each stent, corresponding to the straight sections and the curved parts of the stent. It is shown that the pre-cut stents exhibit less homogeneous thermomechanical properties of the material within each stent compared to the pre-expanded stents. This is attributed to the manufacturing method which involves non-homogeneous bending stress-state for the pre-cut stents.

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Stress-induced martensitic transformation of a NiTi alloy in isothermal shear, tension and compression

Cited by 237 publications

References 30 publications

Determination of the Characteristic Parameters of Tension-Compression Asymmetry of Shape Memory Alloys Using Full-Field Measurements

Determination of the Characteristic Parameters of Tension-Compression Asymmetry of Shape Memory Alloys Using Full-Field Measurements

Stress state effect on mechanical behaviour of shape memory alloys : Experimental characterisation and modelling

Influence of manufacturing methods on the homogeneity and properties of nitinol tubular stents

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