Shape Memory Sensor and Actuator for Air Conditioners

Todoroki, Tsunehiko

doi:10.1016/b978-0-7506-1009-4.50031-7

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…The R-phase transformation shows a high stability during thermomechanical cycling. 52,[60][61][62][63][64] As shown in Fig. 5, 60 the Rphase transformation has superior functional fatigue resistance than the B199 martensite transformation during thermal cycling.…”

Section: Unique Properties and Applicationsmentioning

confidence: 93%

“…Moreover, the R-phase transformation can generate recovery stresses (up to 374 MPa) with a fast response to the temperature change (stress recovery rate up to 17 MPa K 21 ). 29,50,53,61 Based on the above properties, various devices have been developed based on the Rphase transformation, 4,5,60,61,63 such as air conditioner sensor flaps, water mixing valves, oil volume adjustment equipment and so on. 63 Based on the R-phase transformation, NiTi fibres were embedded to control the vibration frequency of a composite material.…”

Section: Unique Properties and Applicationsmentioning

confidence: 99%

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R-phase transformation in NiTi alloys

Wang

Verlinden

Humbeeck

2014

Materials Science and Technology

110

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In near equiatomic NiTi alloys, the thermoelastic transformation between austenite and the R-phase shows unique properties, which make the R-phase transformation very promising for applications. In the present paper, the fundamental issues related to the R-phase transformation, especially the effects of different thermomechanical treatments, are reviewed. Inspired by the literature review, recent work on controlling the R-phase transformation temperature by low temperature aging treatments is summarised.

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Section: Unique Properties and Applicationsmentioning

confidence: 93%

Section: Unique Properties and Applicationsmentioning

confidence: 99%

R-phase transformation in NiTi alloys

Wang

Verlinden

Humbeeck

2014

Materials Science and Technology

110

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“…neglecting the hysteresis. This temperature range is too high for in vivo applications, but because transformation temperatures can be influenced by composition and heat treatment, 17,18 shifting them to lower temperatures is possible.…”

Section: A One-dimensional Casementioning

confidence: 99%

Modeling of a Shape Memory Alloy Active Catheter

Langelaar¹,

Keulen²

2004

45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics &Amp;amp; Materials Conference

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Shape memory alloys (SMAs) have interesting properties for application in adaptive structures, and many researchers have already explored their possibilities. However, the complex behavior of the material makes the development of SMA adaptive structures a challenging task. It is generally accepted that systematic, model-based design approaches and design optimization techniques can be of great assistance in this case. Although some studies on design optimization of relatively simple SMA structures have been published, formal design optimization of more complex SMA devices still requires further exploration. By considering a typical example, i.e. an active catheter, the present paper aims to provide new insights into and solutions for the problems encountered in the practical application of model-based design approaches to SMA adaptive structures. Active catheters are equipped with integrated micro-actuators that enable controlled bending, which yields enhanced maneuverability compared to conventional catheters. Next to a detailed discussion of an SMA active catheter finite element model, a novel SMA constitutive model is introduced. This model combines an adequate representation of the experimentally observed behavior with computational efficiency. Moreover, its history-independent nature significantly simplifies sensitivity analysis. Due to these features, application of optimization techniques to shape memory alloy adaptive structures becomes a realistic possibility.

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“…Like the A $ M transformation, the A $ R transformation also shows shape memory effect and pseudoelasticity [8,9]. Moreover, the A $ R transformation shows attractive properties, such as narrow thermal or stress hysteresis [10,11], fast response to temperature change [1,12,13], as well as high functional stability during thermomechanical cycling [13][14][15][16]. Based on these unique properties, although the transformation strain is small (*1 %) [9,17], various devices have been developed applying the A $ R transformation after proper structural design [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 97%

Fundamental Development on Utilizing the R-phase Transformation in NiTi Shape Memory Alloys

Wang

Kustov

Verlinden

et al. 2015

Shap. Mem. Superelasticity

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In near equiatomic NiTi alloys, the reversible thermoelastic transformation between B2-structured austenite phase and the R-phase is attracting increasing interest for practical applications. However, the following two issues limit the widespread utilization of the R-phase transformation: (1) there is no effective approach to control the R-phase transformation temperatures; (2) it is not easy to largely separate the temperature domain of the R-phase and the B19 0 martensite phase transformation, especially in the presence of an external force. This article reviews concisely the work of the present authors on solving the above two problems. The effect of grain size on the aging microstructure and related transformation behavior is first discussed. Inspired by these findings, an approach to solve the above two problems has been developed by introducing nanoscaled Ni 4 Ti 3 precipitates in the samples with micronsized grains. The performance of alloys associated with the R-phase transformation, which shows controllable transformation temperatures, is summarized.

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Shape Memory Sensor and Actuator for Air Conditioners

Cited by 8 publications

References 5 publications

R-phase transformation in NiTi alloys

R-phase transformation in NiTi alloys

Modeling of a Shape Memory Alloy Active Catheter

Fundamental Development on Utilizing the R-phase Transformation in NiTi Shape Memory Alloys

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