Optimisation of Ni–Ti shape memory alloy response time by transient heat transfer analysis

Huang, Shunmei; Leary, Martin; Ataalla, T.; Probst, K.J.; Subic, Aleksandar

doi:10.1016/j.matdes.2011.09.043

Cited by 40 publications

(26 citation statements)

References 33 publications

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“…This could be reduced by using a smaller diameter wire, since the cooling-rate is proportional to the quotient of wire-mass to wire-surface, which decreases linearly with the wire diameter. Another approach is to surround the wire with a thermal compound and a shell in order to increase the wire-surface and therefore the wire's cooling rate, as shown in [4]. However this technique increases the actuator volume and consequently decreases the work density.…”

Section: Discussionmentioning

confidence: 99%

Shape Memory Microactuator for Surgical Instruments

Rothfuss

Schächtele

Stallkamp

2013

Biomedical Engineering / Biomedizinische Technik

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Shape memory alloys have great potential for use as an actuation material in miniaturized actuators for surgical instruments. Their performance and possible applications are discussed in this paper. A wire-based SMA actuator was designed and a controller for the wire-length was designed and implemented. The closed loop performance and possibilities for optimization are also discussed in this paper.

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Section: Discussionmentioning

confidence: 99%

Shape Memory Microactuator for Surgical Instruments

Rothfuss

Schächtele

Stallkamp

2013

Biomedical Engineering / Biomedizinische Technik

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“…MR fluids have been applied in brakes [2,3], clutches [4,5], shock absorbers [6,7], valves [8], and so on. SMAs may undergo mechanical shape changes at relatively low temperatures and retain them until heated, then coming back to the initial shape [9]. This makes SMAs unique compared to other smart materials that can be used for actuator applications [10].…”

Section: Introductionmentioning

confidence: 99%

Model of Torque in Disc-Type Magnetorheological Brake Driven by Shape Memory Alloy

Ma¹,

Zhao²,

Tian³

2017

Proceedings of the 2017 2nd International Conference on Electrical, Automation and Mechanical Engineering (EAME 2017)

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Abstract-A magnetorheological brake driven by shape memory alloy is presented in this paper. The shape memory alloy spring is used to push the magnetorheological fluid into the working gap under thermal effect. Herschel-Bulkley model is used to describe the constitutive characteristics of magnetorheological fluids subject to an applied magnetic field. The braking torque developed by magnetorheological fluid is derived to evaluate the braking performance. The results indicate that, the braking torque changes rapidly according to strength of applied magnetic field.

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“…These properties are the result of phase martensite-austenitic transformations [1]. Martensite phase transformation of alloys can be caused by other factors as well, but they mostly depend on temperature [2]. In the austenite phase, shape-memory alloys are a hard and solid material, and when these alloys are in the state of martensite -they are soft and flexible.…”

Section: Introductionmentioning

confidence: 99%