Stress-Strain-Temperature Relationship Associated with the R-Phase Transformation in TiNi Shape Memory Alloy

Tobushi, Hisaaki; Tanaka, Kikuaki; Kimura, Kimio; Hori, Tatsuya; Sawada, Takayuki

doi:10.1299/jsmea1988.35.3_278

Cited by 31 publications

(16 citation statements)

References 5 publications

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“…For the investigation of topology optimization of SMA actuators, the focus is on a Ti‐55.3wt%Ni alloy investigated earlier in e.g. 31. This alloy exhibits the R‐phase transformation, which is known for its relatively small hysteresis 2.…”

Section: Structural Modelingmentioning

confidence: 99%

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Electrochemically Informed Synthesis: Oxidation versus Coordination of 5,6‐Bis(phenylchalcogeno)acenaphthenes

et al. 2013

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Section: Structural Modelingmentioning

confidence: 99%

“… (a) Experimentally obtained stress–strain curves at various temperatures 31. Thin lines are unloading curves and (b) schematic representation of a piecewise linear SMA stress–strain relation.…”

Section: Structural Modelingmentioning

confidence: 99%

Electrochemically Informed Synthesis: Oxidation versus Coordination of 5,6‐Bis(phenylchalcogeno)acenaphthenes

et al. 2013

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“…The SMA characteristic testing machine was used for the experiments for the wire [16]. In the tests, temperature on the surface of the wire was measured through a thermocouple with diameter of 0.1 mm.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Characteristics of energy storage and dissipation in TiNi shape memory alloy

Pieczyska

Gadaj

Nowacki

et al. 2005

Science and Technology of Advanced Materials

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The characteristics of energy storage and dissipation in TiNi shape memory alloys were investigated experimentally based on the superelastic properties under various thermomechanical loading conditions. The influence of strain rate, cyclic loading and temperature-controlled condition on the characteristics of energy storage and dissipation of the material was investigated. Temperature on the surface of the material was observed and the influence of variation in temperature on the characteristics was clarified. The results obtained can be summarized as follows. (1) In the case of low strain rate, the stress plateaus appear on the stress-strain curves due to the martensitic transformation and the reverse transformation during loading and unloading. In the case of high strain rate, the slopes of the stress-strain curves are steep in the phase-transformation regions during loading and unloading. The recoverable strain energy per unit volume increases in proportion to temperature, but the dissipated work per unit volume depends slightly on temperature. In the case of low strain rate, the recoverable strain energy and dissipated work do not depend on both strain rate and the temperature-controlled condition. (2) In the case of high strain rate, while the recoverable strain energy density decreases and dissipated work density increases in proportion to strain rate under the temperature-controlled condition, the recoverable strain energy density increases and dissipated work density decreases under the temperature-uncontrolled condition. In the case of the temperature-uncontrolled condition, temperature varies significantly due to the martensitic transformation and therefore the characteristics of energy storage and dissipation differ from these under the temperature-controlled condition. (3) In the case of cyclic loading, both the recoverable strain energy and dissipated work decrease in the early 20 cycles, but change slightly thereafter. (4) The influence of strain rate, cyclic loading and the environment on the characteristics of energy storage and dissipation is important to be considered in the design of shape memory alloy elements. q

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“…This transformation is characterized by a particularly small hysteresis and excellent cyclic stability, which makes it well suited for many actuation applications. Experimental data obtained by Tobushi et al 8 of the stress-strain-temperature behavior of a Ti-55.3wt%Ni alloy exhibiting the R-phase transformation is shown in Fig. 1.…”

Section: Materials Selection and Modeling Considerationsmentioning

confidence: 98%

Design optimization of shape memory alloy active structures using the R-phase transformation

Langelaar

Keulen

2007

SPIE Proceedings

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This article illustrates the opportunities that combining computational modeling and systematic design optimization techniques offer to facilitate the design process of shape memory alloy (SMA) structures. Focus is on shape memory behavior due to the R-phase transformation in Ni-Ti, for which a dedicated constitutive model is formulated. In this paper, efficient topology and shape optimization procedures for the design of SMA devices are described. In order to achieve fast convergence to optimized designs, sensitivity information is computed to allow the use of gradient-based optimization algorithms. The effectiveness of the various optimization procedures is illustrated by numerical examples, including the design of a miniature SMA gripper and a steerable SMA active catheter. It is shown that design optimization enables designers of SMA structures to systematically enhance the performance of SMA devices for a variety of applications.

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Stress-Strain-Temperature Relationship Associated with the R-Phase Transformation in TiNi Shape Memory Alloy

Cited by 31 publications

References 5 publications

Electrochemically Informed Synthesis: Oxidation versus Coordination of 5,6‐Bis(phenylchalcogeno)acenaphthenes

Electrochemically Informed Synthesis: Oxidation versus Coordination of 5,6‐Bis(phenylchalcogeno)acenaphthenes

Characteristics of energy storage and dissipation in TiNi shape memory alloy

Design optimization of shape memory alloy active structures using the R-phase transformation

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