Mechanical behaviour of shape memory alloys for seismic applications 2. Austenite NiTi wires subjected to tension

Dolce, Mauro; Cardone, Donatello

doi:10.1016/s0020-7403(01)00050-9

Cited by 350 publications

(272 citation statements)

References 19 publications

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“…40 °C and 60 °C), the load-deformation curves became 'narrower', and the load at ultimate deformation increased with increasing temperature. This is coherent with previous research findings for axially loaded SMA wires under various temperatures, where it was generally observed that increasing the temperature could increase the forward/reverse loading plateaus as well as the residual deformation [27][28][29]. The increased residual deformation was caused by some amount of plastic (permanent) deformation of the specimens under elevated temperatures, where the required forward transformation stress might have exceeded the true yield (plastic) stress of the material.…”

Section: Figsupporting

confidence: 91%

“…7(a), and W E is the strain energy stored in a linear system that has the same maximum load and deformation [28].EVD is normally related to the shape of the hysteretic loop, but is not directly dependent on the actual value of the force or displacement; therefore, EVD can be considered as a 'size-independent' measurement of energydissipating ability. It was observed that for the tested specimens, an EVD of up to 7% could be achieved for the first loading cycle.…”

Section: Fig 7 Energy Dissipation Responses Of Specimensmentioning

confidence: 99%

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Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Fang

Zhou

Osofero

et al. 2016

Smart Mater. Struct.

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This study sheds considerable light on the potential of superelastic Shape Memory Alloy (SMA) Belleville washers for innovative seismic resisting applications. A series of experimental studies were conducted on washers with different stack combinations under varying temperatures and loading scenarios. The washers showed satisfactory self-centring and energy dissipation capacities at room temperature, although slight degradations of the hysteretic responses accompanied by residual deformations were induced. The hysteretic loops became stable after a few number of cycles, indicating good repeatability. The washers also showed good flexibility in terms of load resistance and deformation, which could be easily varied via changes in the stack combination. Compromised selfcentring responses were observed at temperatures below 0 °C or above 40 °C, and a numerical study, validated by the experimental results, was adopted to further investigate the deformation mechanism of the washers. A further phenomenological model, taking account of the degradation effects under varied temperatures, was developed to enable effective and accurate simulation of devices incorporating the washers. Good agreements were observed between the test and simulation results, and the model was shown to have good numerical robustness for wide engineering applications.

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Section: Figsupporting

confidence: 91%

Section: Fig 7 Energy Dissipation Responses Of Specimensmentioning

confidence: 99%

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Fang

Zhou

Osofero

et al. 2016

Smart Mater. Struct.

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“…Analysing the stress-strain curve of the base material in Chan et al work [132], it can be observed that the tensile stress of NiTi base material and its elongation at fracture are considerably lower than most studies reported in the literature such as [5,201,202], where NiTi was tested in more demanding conditions, in terms of strain or stress applied, without fracture. Gugel et al [128] reported that similar laser welds presented a stress-strain behaviour similar to the base material, but the UTS of the welded joints was 25% below that of the base material.…”

Section: Tensile Propertiesmentioning

confidence: 93%

“…Superelasticity occurs by the application of stress when the material is in the temperature range of thermally stable austenite. Such property allows for the material to undergo a significant deformation during loading (up to 10% strain) with full recovery of its shape upon unloading [5], as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira

Miranda

Fernandes

2017

Progress in Materials Science

272

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“…For instance, these alloys are highly attractive for energy absorption/storage, impact damping or seismic protection [1][2][3]. Nevertheless, the thermomechanical behaviour of these alloys at impact strain rates, on the order 1-10 2 s -1 , is not yet well known and only a few works deal with the dynamics of propagating phase boundaries at impact strain rates [4], while the maximum strain rate at which the transformation fronts have been observed via infrared radiation has been 10 -2 s -1 [5,6].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation fronts propagation during the stress induced martensitic transformation at impact strain rates in NiTi shape memory alloy wires

Zurbitu

Castillo

Aretxabaleta

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. Propagation of phase transformation fronts during the stress induced martensitic (SIM) transformation at impact strain rates, on the order of 10 s -1 , was observed in situ by measuring changes in infrared radiation on the surface of superelastic NiTi wires. The exothermic/endothermic character of the forward/reverse SIM transformation changes the local temperature making visible the nucleation and propagation of phase transformation fronts. The nucleation during forward SIM transformation usually occurs at both ends of the sample near the grips, where stress concentrations are unavoidable. During unloading, nucleation of the reverse SIM transformation takes place at point where the forward SIM transformation was finished. At impact no more nucleations were observed so that only the phase transformation fronts arising from the mentioned nucleations appear. In the non-transformed zone, the temperature remains similar to that observed for the test in which only the elastic deformation of the austenitic phase occurs. This feature shows that the SIM transformation at impact strain rates is inhomogeneous and, similarly to that observed at very low strain rates, lower than 10 -4 s -1 , when the deformation may be considered as an isothermal process and the temperature in the sample remains almost constant, no multiple transformation fronts appear as is observed when strain rate is on the order of 10 -4 -10 -2 s -1 . For specimens cycled at impact, the nucleation at the beginning of the SIM transformation occurs at several locations and during the deformation more nucleation points arise since the stress necessary to initiate another nucleations is lower than necessary to continue the propagation of the active fronts. These locations are similar for different cycles showing that they do not arise by chance, but rather because there are locations more favourable for the nucleation.

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Mechanical behaviour of shape memory alloys for seismic applications 2. Austenite NiTi wires subjected to tension

Cited by 350 publications

References 19 publications

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Superelastic SMA Belleville washers for seismic resisting applications: experimental study and modelling strategy

Welding and Joining of NiTi Shape Memory Alloys: A Review

Phase transformation fronts propagation during the stress induced martensitic transformation at impact strain rates in NiTi shape memory alloy wires

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