Characterization of NiTi SMA in its unusual behaviour in wear tests

Levintant-Zayonts, N.; Starzyński, G.; Kopeć, Mateusz; Kucharski, S.

doi:10.1016/j.triboint.2019.05.005

Cited by 37 publications

(7 citation statements)

References 28 publications

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“…This change process is actually a phase transfer process in the material, as shown in Figure 1, which shows the shape memory process of Ni-Ti (Nickel Titanium) alloy (Levintant-Zayonts et al, 2019; Shayanfard et al, 2018). Current heating makes the temperature of the material rise, and natural cooling makes the temperature of the material lower, so as to realize the shape change of the material.…”

Section: Materials Properties Of Smamentioning

confidence: 97%

Stochastic recruitment limited control of shape memory alloy based on Markov chain model

Cui

Liu

Zhang

2021

Journal of Intelligent Material Systems and Structures

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A new control method of Shape Memory Alloy (SMA) actuators based on stochastic recruitment is proposed. From the perspective of bionic control, the physiological basis of stochastic recruitment limited feedback control of artificial muscle is explained. The limited feedback control system of two-state cells and multi-state cells are established, and the limited feedback control law is deduced for these two kinds of systems. In the Simulink environment, two kinds of limited feedback control algorithms are simulated and compared, which verifies the feasibility of the algorithm. Aiming at the key problem of scaling coefficient in the system, the longitudinal and transverse comparative experiments are carried out to analyze the influence of the scaling coefficient on the system.

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Section: Materials Properties Of Smamentioning

confidence: 97%

Stochastic recruitment limited control of shape memory alloy based on Markov chain model

Cui

Liu

Zhang

2021

Journal of Intelligent Material Systems and Structures

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“…The results of DSC show As = 29.4 °C and Ms = -31.1 °C in the aged alloy, and Ms is below -120 °C in the solutionized alloy, which illustrates that the matrix of both alloys will be in the B2 state before the wear test at room temperature. The elastic modulus substantially affects the contact stress according to the Hertz theory, while the superelasticity of the TiNi alloy significantly influences its wear behavior [6][7][8].…”

Section: Microstructural and Calorimetric Features Before Frictionmentioning

confidence: 99%

“…Their potential SE adds to the combination of high coefficient of friction (COF) and an impressive wear resistance, which incites researchers to investigate them as wear-resistant materials [2−5]. The existing studies on the tribological applications of TiNi SMAs primarily illustrate the influence from the microstructure and experimental conditions on its tribological behaviors, e.g., phase states [6], grain size [2], temperature [7], and loading [8]. The tribological features of SMAs significantly depend on stress induced martensitic (SIM) transformation and reversible transformation [2, 9−11], and no efforts have been spared to study the oxidation of TiNi SMAs induced by dry sliding.…”

Section: Introductionmentioning

confidence: 99%

Self-lubrication of tribologically-induced oxidation during dry reciprocating sliding of aged Ti-Ni51.5 at% alloy

Yang

Duan

et al. 2020

Friction

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The tribological behaviors of Ti-Ni51.5 at% alloy strengthened by finely dispersed Ni4Ti3 particles in reciprocating sliding against GCr15, Al2O3, and ZrO2 at room temperature were studied. Interestingly, the coefficient of friction (COF) suffered a sheer drop (from 0.9 to 0.2) when the aged alloy slid against GCr15 at a frequency of 20 Hz under a 20 N load without lubrication. However, severe-mild wear transition disappeared when a solutionized alloy was used. Moreover, the COF stabilized at a relatively high level when Al2O3 and ZrO2 were used as counterparts, although their wear mechanisms showed signs of oxidation. Scanning electron microscopy (SEM) and X-ray element mappings of the wear scars of the counterparts clearly indicate that the formation of well-distributed tribo-layer and material transfer between the ball and disk are pivotal to the severe-to-mild wear transition in the aged Ti-Ni51.5 at% alloy/GCr15 friction pair. The higher microhardness and superelasticity of the aged alloy significantly accelerate the material transfer from GCr15 to the disk, forming a glazed protective tribo-layer containing Fe-rich oxides.

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“…The strain resulting from the reorientation of the molecular structure can be up to about 8% (Jani et al, 2014;Mosley and Mavroidis, 2001;Paiva and Savi, 2006). NiTi is an SMA made of titanium and nickel, which provide large strain in the superelastic condition, making NiTi a realistic actuators for many potential applications in biomedical, electrical and aerospace engineering (Levintant-Zayonts et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Stress-dependent generalized Prandtl–Ishlinskii hysteresis model of a NiTi wire with superelastic behavior

Yeo

2021

Journal of Intelligent Material Systems and Structures

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The extremely useful superelastic behavior of NiTi has been poorly explored because of the limited number of models that can describe the complete hysteretic behavior of NiTi, including a superelastic condition that strongly depends on the applied stress. This paper presents the development of a stress-dependent phenomenological model of NiTi by modifying the existing generalized Prandtl–Ishlinskii (GPI) model. The parameters of the envelop function of the GPI model’s play operator are reformulated as quadratic functions of the applied stress. The stress-dependent GPI model can satisfactorily predict the output strain of a NiTi #6 wire under temperature and stress variation.

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Characterization of NiTi SMA in its unusual behaviour in wear tests

Cited by 37 publications

References 28 publications

Stochastic recruitment limited control of shape memory alloy based on Markov chain model

Stochastic recruitment limited control of shape memory alloy based on Markov chain model

Self-lubrication of tribologically-induced oxidation during dry reciprocating sliding of aged Ti-Ni51.5 at% alloy

Stress-dependent generalized Prandtl–Ishlinskii hysteresis model of a NiTi wire with superelastic behavior

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