考虑应变幅值影响的超弹性SMA相变棘轮行为宏观唯象本构模型

doi:10.11896/cldb.24050012

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Abstract In order to achieve full potential of the superelastic properties of shape memory alloys (SMA) in practical engineering applications, this work carried out uniaxial cyclic tensile tests were carried out on superelastic SMA filaments, and based on the test results and the improved Graesser's ontological model in the framework of generalized visco-plasticity, established a macroscopic only-imaginary ontological model that can unify the ratcheting behavior of the phase change of SMA and the stable superelasticity. The study first analyzed the influence of strain amplitude and cycle number on the characteristic parameters and energy dissipation characteristics of the phase transition of superelastic SMA through the experimental results. Second, by taking the accumulation of inelastic strain of SMA as the internal variable and considering the martensitic hardening characteristics, it introduced the evolution equation of the characteristic parameters of superelastic SMA into the improved Graesser model to expand the ontological model that can unify the phase transition behavior of superelastic SMA. It then adopted this ontological model to establish the macro-only model that can unify the phase transition ratchet behavior of SMA and the stable superelastic behavior of SMA. Finally the model is used to numerically simulate the hysteresis curve of hyperelastic SMA during uniaxial cyclic stretching, to compare the predicted results with the hysteresis curve of the experimental results, and to evaluate the prediction error of the energy dissipation of hyperelastic SMA in a single loop. The results showed that the new model could broaden the scope of application of the improved model. And on the basis of retaining the original function, it could also accurately describe the phase change ratchet behavior of superelastic SMA under the influence of varying strain amplitude, with a high prediction accuracy of the single-loop energy dissipation value. The output of this work may provide a better applicative theory for the superelastic SMA energy dissipation unit in engineering practice.

Key words： shape memory alloy superelasticity phase transition ratchet behavior strain amplitude Graesser constitutive model

Published: Online: 2025-08-28

CLC number:

TG139.6

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	Articles by authors
	YANG Tao
	LIU Zhangrui
	LIU Bo
	ZHANG Yang

Cite this article:

YANG Tao,LIU Zhangrui,LIU Bo, et al. A Macroscopic Phenomenological Constitutive Model of Superelastic SMA Phase Transition Ratchet Behavior Considering the Effect of Strain Amplitude[J]. Materials Reports, 2025, 39(17): 24050012-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24050012 OR https://www.mater-rep.com/EN/Y2025/V39/I17/24050012

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