Thermal diffusivity of Ni–Ti SMAs

Zanotti, C.; Giuliani, P.; Riva, G.; Tuissi, A.; Chrysanthou, A.

doi:10.1016/j.jallcom.2008.05.040

Cited by 26 publications

(21 citation statements)

References 13 publications

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“…The first step concerned the characterisation of the ceramic support and the procedure was described in one of our earlier publications [8]. The second step was concerned with the estimation of the free convection heat exchange coefficient of the ceramic holder once this was mounted in the sample support.…”

Section: Resultsmentioning

confidence: 99%

“…The code has been written by considering as the forcing term the temperature history of the heated surface and calculates the temperature within the NiTi sample on the basis of the thermophysical properties of the materials. This approach was previously presented in detail by the authors [8,9] and only a brief description is reported here. Fig.…”

Section: Numerical Approachmentioning

confidence: 99%

“…A cylindrical NiTi sample of 8 mm diameter and 8 mm length was placed in a special holder and tightened between an aluminium disc and a ceramic support, as shown in the sketch in [8,9] at different working conditions at pressure values below atmospheric by using a vacuum pump system to reduce the pressure to the working value. The experimental apparatus was equipped with a laser diode system (LW-30250) that provided a maximum power of 250W in a continuous wave mode with a wavelength centred at 805e810 nm.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…While the NiTi phase exists over a narrow stoichiometric range, the temperature of the martensitic transformation is strongly dependent on the chemical composition. The thermal properties in the transformation temperature range can vary significantly and this can influence the response time behaviour of NiTi materials when actuators are thermally activated [8]. For this reason, the characteristic switching time of the actuators is connected to the capability of the NiTi materials to transfer heat during the heating and cooling transient.…”

Section: Introductionmentioning

confidence: 99%

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Martensitic–Austenitic phase transformation of Ni–Ti SMAs: Thermal properties

2012

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Section: Resultsmentioning

confidence: 99%

Section: Numerical Approachmentioning

confidence: 99%

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Martensitic–Austenitic phase transformation of Ni–Ti SMAs: Thermal properties

2012

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“…For this study, the temperature dependent thermal conductivity and heat capacity parameters are obtained from different experimental studies [55][56][57]. For the D2Q9 lattice system, the equilibrium distribution function of heat energy is expressed as [58,59] ( ) ( ) ( ) …”

Section: Lattice Boltzmann (Lb) Methods For Heat Transfermentioning

confidence: 99%

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Gur

Frantziskonis

2016

Modelling Simul. Mater. Sci. Eng.

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Martensitic phase transformation in NiTi shape memory alloys (SMA) occurs over a hierarchy of spatial scales, as evidenced from observed multiscale patterns of the martensitic phase fraction, which depend on the material microstructure and on the size of the SMA specimen. This paper presents a methodology for the multiscale tracking of the thermally induced martensitic phase transformation process in NiTi SMA. Fine scale stochastic phase field simulations are coupled to macroscale experimental measurements through the compound wavelet matrix method (CWM). A novel process for obtaining CWM fine scale wavelet coefficients is used that enhances the effectiveness of the method in transferring uncertainties from fine to coarse scales, and also ensures the preservation of spatial correlations in the phase fraction pattern. Size effects, well-documented in the literature, play an important role in designing the multiscale tracking methodology. Molecular dynamics (MD) simulations are employed to verify the phase field simulations in terms of different statistical measures and to demonstrate size effects at the nanometer scale. The effects of thermally induced martensite phase fraction uncertainties on the constitutive response of NiTi SMA is demonstrated.

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