Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy

Jacobus, Kurt; Şehitoğlu, Hüseyin; Balzer, Mark A.

doi:10.1007/bf02663855

Cited by 109 publications

(71 citation statements)

References 19 publications

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“…The influence of the direction of a uniaxial normal stress (tension vs. compression) on superelastic stressinduced martensitic transformation has been observed on SMA single crystals as well as on textured or non-textured SMA polycrystals [6,[13][14]17,19,[24][25][26][27][28][29][30][31][32]. As an example, Figure 3 displays engineering stress-strain curves for a cyclic superelastic tension-compression test performed on one polycrystalline CuZnAl (Figure 3(a), [19]) and for two monotonic tension and compression tests performed at the same testing temperature on two identical NiTi polycrystalline plate samples (Figure 3(b), [14]).…”

Section: Comparison Between Compression and Tensionmentioning

confidence: 99%

“…In order to improve description of the criterion for 3D yield by transformation, stress-induced martensitic transformation was also investigated under multi-axial stress state [26][27][28][34][35]. Lexcellent et al [26] performed combined tension-compression-torsion experiments using NiTi polycrystalline tubular samples as sketched in Figure 7(a).…”

Section: Combined Loadingmentioning

confidence: 99%

“…A further understanding of stress-induced martensitic transformation was obtained on textured NiTi and CuZnAl polycrystals deformed during revolution triaxial tests [27][28]. Results indicate that stressinduced martensitic transformation in textured SMAs is dependent on the applied hydrostatic pressure.…”

Section: Combined Loadingmentioning

confidence: 99%

“…The results presented in section 3 demonstrate that this criterion, independent of l a and (p a , cannot satisfactorily model transformation/reorientation yield surface in SMAs. The role of pressure (or I a ) on superelastic behaviour has been studied experimentally only in the case of textured SMAs [27][28]. In that respect, as transformation/reorientation occur with a quasi-nil volume variation, all the developed macroscopic models assume that the pressure effect in isotropic SMAs is negligible.…”

Section: Macroscopic Transformation/reorientation Criteriamentioning

confidence: 99%

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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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Section: Comparison Between Compression and Tensionmentioning

confidence: 99%

Section: Combined Loadingmentioning

confidence: 99%

Section: Combined Loadingmentioning

confidence: 99%

Section: Macroscopic Transformation/reorientation Criteriamentioning

confidence: 99%

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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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“…[3] As a consequence, the study of the deformation and fracture behavior of Nitinol and its composites under various loading conditions becomes critical for the large-scale utilization of Nitinol. The mechanical response of Nitinol has been extensively studied experimentally and theoretically, at both quasistatic [10][11][12][13][14][15][16][17] and high strain rates. [18][19][20][21][22][23] However, the utilization and the potential application of Nitinol in long-life components as a structural material requires a thorough understanding of the dominant deformation and fracture mechanisms of Nitinol under different loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Fracture of Nitinol under Quasistatic and Dynamic Loading

Jiang

Vecchio

2007

Metall Mater Trans A

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Owing to the potential application of Nitinol as an advanced structural material, it is essential to thoroughly understand the deformation and fracture behavior of Nitinol under various loading conditions. The present study explores the fracture behavior of Nitinol under quasistatic and dynamic loading, with emphasis on the fracture toughness and fracture mechanism of Nitinol. To this end, the precracked bend sample was employed to perform dynamic fracture testing using a modified (pulse-shaped) Hopkinson-pressure-bar-loaded fracture-testing system. The dynamic fracture initiation toughness was measured under stress-state equilibrium conditions at a loading rate of $ 10 6 MPa ffiffiffiffi m p /s. To further investigate the fracture mechanism, additional dynamic fracture tests were performed using double-crack, four-point bend samples. The experimental results indicate that the dynamic fracture toughness of Nitinol is higher than it is under quasistatic loading, and that the loading rate influences the fracture mechanisms of Nitinol. The interplay between the dynamic strength of Nitinol and the activation stress for stress-induced martensite (SIM) transformation plays an important role in the fracture behavior of Nitinol.

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Mathematical Modeling and Simulation

Mirzaeifar¹,

Elahinia²

2015

Shape Memory Alloy Actuators

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Effect of stress state on the stress-induced martensitic transformation in polycrystalline Ni-Ti alloy

Cited by 109 publications

References 19 publications

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

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

Fracture of Nitinol under Quasistatic and Dynamic Loading

Mathematical Modeling and Simulation

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