Shape‐memory Alloys Handbook

Lexcellent, Christian

doi:10.1002/9781118577776

Cited by 129 publications

(108 citation statements)

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“…In parallel, the experimental investigation of SMA microstructure has adopted a variety of means, primarily optical and electron microscopy, originating an extensive literature, see for instance the references in [1][2][3]. Developments in the techniques of full-field measurements have recently also enabled the experimental analysis of the microstructural strain field over extended regions of a sample's surface.…”

Section: Introductionmentioning

confidence: 99%

“…Shape-memory alloys (SMAs) are active crystalline materials with desirable mechanical properties, exploited in a number of applications from engineering to medicine, as actuators, sensors and dampeners [1][2][3]. In these substances, effects such as super-(or pseudo-)elasticity and shape memory originate from a reversible martensitic transformation triggered by either stress or temperature.…”

Section: Introductionmentioning

confidence: 99%

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Strain intermittency in shape-memory alloys

et al. 2015

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We study experimentally the intermittent progress of the mechanically-induced martensitic transformation in a Cu-Al-Be single crystal through a full-field measurement technique: the grid method. We utilize an in-house especially designed gravity-based device, wherein a system controlled by water pumps applies a perfectly monotonic uniaxial load through very small force increments. The sample exhibits hysteretic superelastic behavior during the forward and reverse cubic-monoclinic transformation, produced by the evolution of the strain field of the phase microstructures. The in-plane linear strain components are measured on the sample surface during the loading cycle, and we characterize for the first time the strain intermittency in a number of ways, showing the emergence of power-law behavior for the strain avalanching over almost six decades of magnitude. We also describe the non-stationarity and the asymmetry observed in the forward vs. the reverse transformation. The present experimental approach, which allows for the monitoring of the reversible martensitic transformation both locally and globally in the crystal, proves useful and enhances our capabilities in the analysis and possible control of transition-related phenomena in shape-memory alloys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain intermittency in shape-memory alloys

et al. 2015

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“…4(a). SMA are characterized by a strongly non-linear thermomechanical coupling, which has been modeled and understood during the last decades, [7].…”

Section: Fig 2: Hfvte Actuatormentioning

confidence: 99%

Implementation of a Hybrid Electro-Active Actuated Morphing Wing in Wind Tunnel

Jodin

Scheller

Duhayon

et al. 2017

SSP

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 19940 Abstract. Amongst current aircraft research topics, morphing wing is of great interest for improving the aerodynamic performance. A morphing wing prototype has been designed for wind tunnel experiments. The rear part of the wing -corresponding to the retracted flap -is actuated via a hybrid actuation system using both low frequency camber control and a high frequency vibrating trailing edge. The camber is modified via surface embedded shape memory alloys. The trailing edge vibrates thanks to piezoelectric macro-fiber composites. The actuated camber, amplitude and frequency ranges are characterized. To accurately control the camber, six independent shape memory alloy wires are controlled through nested closed-loops. A significant reduction in power consumption is possible thanks this control strategy. The effects on flow via morphing have been measured during wind tunnel experiments. This low scale mock-up aims to demonstrate the hybrid morphing concept, according to actuator capabilities point of view as well as aerodynamic performance.

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“…In figures 3 and 4, the length parameters have been normalized with respect to the quantity The resolution process is the same than the case of the crack tip without curvature but the calculation more complicated. They are explicated in the book of C. Lexcellent [13].…”

Section: Introductionmentioning

confidence: 99%