Experimental Determination of the Hysteretic Properties in Shape Memory Alloys

Tourabi, A.; Wack, B.; Favier, Damien

doi:10.4028/www.scientific.net/msf.56-58.535

Cited by 4 publications

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“…Figure 6(b) also shows that the shear modulus of elasticity, taken as the maximum value of the slope after each reversion point is dependent on the strain. This observation agrees with previous studies by Tourabi et al [18] and by Liu and Xiang [10). In linear isotropic elasticity, the moduli of elasticity in compression, tension and shear are related by E = E, = 2/i(l+v).…”

Section: Comparison Between Torsion/shear and Tension/compressionsupporting

confidence: 83%

“…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%

“…Figure 6(a) represents shear stress-strain curve, with the shear strain being measured by strain gages bonded to the specimen gauge section. The shear stress is calculated from the recorded torque, since the thickness of the tube is rather small compared to the average radius [18]. The evolutions of the slope of the shear stress-strain curve during the first 0.4% shear strain variation on the unloading branches after each reversion are plotted in Figure 6(b).…”

Section: Comparison Between Torsion/shear and Tension/compressionmentioning

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 Torsion/shear and Tension/compressionsupporting

confidence: 83%

Section: Non-homogeneity Of the Tensile Testmentioning

confidence: 99%

Section: Comparison Between Torsion/shear and Tension/compressionmentioning

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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“…The experimental results reported above reveal a close parallelism between the irreversible nature of the two mechanical deformation modes in SMAs [19]. The irreversible nature of these two processes appears to respect a common set of phenomenological rules Ell], which are reformulated and summarised as following.…”

Section: Discussionmentioning

confidence: 86%

Experimental Study of Mechanical Hysteresis of NiTi During Ferroelastic and Superelastic Deformation

1997

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Abstract. Shape memoxy alloys are known to exhibit a range of novel thermomechanical behaviour associated with the unique themoelastic martensitic transformation. Such behaviour includes the superelasticity associated with stress-induced martensitic transformation at relatively high temperatures and the ferroelasticity associated with a martensite reorientation process at low temperatures. Both the stress-induced martensitic transformation and the martensite reorientation are energy-dissipative processes, i.e., hysteretic between the forward and reverse processes. This work was aimed at studying the hysteretic behaviour of the ferroelasticity and superelasticity observed in a polycrystalline NiTi alloy by canying out simple shear deformation tests through both major and subloop cycles. It was found that subloops are always closed and enclosed inside the major loop and that the stress hysteresis of a subloop is only dependent on the strain amplitude of the subloop, regardless of the position of the subloop inside the major loop.

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“…A large number of experimental studies have been devoted to the analysis of the complex hysteretic behaviour of polycrystalline or single crystal SMAs (Cu-based or NiTi-based alloys). They focused on hysteresis occurring during thermallyinduced martensitic transformation [2][3][4], stress-induced martensitic transformation in superelasticity [5][6][7][8][9][10], and martensite reorientation in ferroelasticity [10,12]. A set of phenomenological observations describing the hysteresis have been deduced from such experimental results [10,11].…”

Section: Introductionmentioning

confidence: 99%

Hysteretic behaviour of a Cu–Zn–Al single crystal during superelastic shear deformation

Orgéas¹,

Vivet²,

Favier³

et al. 2004

Scripta Materialia

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Experimental Determination of the Hysteretic Properties in Shape Memory Alloys

Cited by 4 publications

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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

Experimental Study of Mechanical Hysteresis of NiTi During Ferroelastic and Superelastic Deformation

Hysteretic behaviour of a Cu–Zn–Al single crystal during superelastic shear deformation

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