scholarly journals Durability of the Flexible Shape Memory Device

2015 ◽  
Vol 11 (2) ◽  
pp. 36-40
Author(s):  
Hee-Kyung Yang ◽  
Hae-Jin Kim ◽  
Dae-Eun Kim
Keyword(s):  
Shape Memory ◽  
Memory Device

Electromagnetic induction heating of an orthopaedic nickel-titanium shape memory device

2010 ◽  
Vol 28 (12) ◽  
pp. 1671-1676 ◽  
Author(s):  
Christian W. Müller ◽  
Ronny Pfeifer ◽  
Tarek El-Kashef ◽  
Christof Hurschler ◽  
Dirk Herzog ◽  
...  
Keyword(s):  
Shape Memory ◽  
Induction Heating ◽  
Electromagnetic Induction ◽  
Memory Device ◽  
Nickel Titanium ◽  
Electromagnetic Induction Heating

scholarly journals Proof of Concept Study for the Design, Manufacturing, and Testing of a Patient-Specific Shape Memory Device for Treatment of Unicoronal Craniosynostosis

2018 ◽  
Vol 29 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Alessandro Borghi ◽  
Will Rodgers ◽  
Silvia Schievano ◽  
Allan Ponniah ◽  
Owase Jeelani ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Device ◽  
Patient Specific ◽  
Proof Of Concept ◽  
Concept Study ◽  
Specific Shape

Characterizing the nonlinear behavior of a pseudoelastic oscillator via the wavelet transform

2015 ◽  
Vol 230 (1) ◽  
pp. 120-132 ◽  
Author(s):  
Vinicius Piccirillo ◽  
José M Balthazar ◽  
Angelo M Tusset ◽  
Davide Bernardini ◽  
Giuseppe Rega
Keyword(s):  
Wavelet Transform ◽  
Shape Memory ◽  
Nonlinear Behavior ◽  
Memory Device ◽  
Internal Variable ◽  
Hysteretic Behavior ◽  
Thermomechanical Model ◽  
Restoring Force ◽  
External Sources ◽  
Scalogram Analysis

The nonlinear dynamics of a shape memory oscillator (SMO) subjected to an ideal or nonideal excitation is studied. The restoring force of the oscillator is provided by a shape memory device (SMD), described by a thermomechanical model capable of reproducing the hysteretic behavior via the evolution of a suitable internal variable. Due to nonlinearities in the model, the SMO can exhibit periodic or non-periodic behaviors. The effects of the external sources on the response of SMO are studied through the scalogram analysis of continuous wavelet transform by using a new measure, called the Scale index (Benitez R, Bolos VJ and Ramirez ME. A wavelet-based tool for studying non-periodicity. Comput Math Appl 2010; 60: 634–641). Numerical results show that the Scale index can successfully detect the behavior of the system when the signal is periodic or nonperiodic, and distinguish between them in a way consistent with the indications provided by the alternative 0-1 test.

A shape memory device for the treatment of high myopia

2008 ◽  
Vol 481-482 ◽  
pp. 651-653 ◽  
Author(s):  
I.Yu. Khmelevskaya ◽  
E.P. Ryklina ◽  
S.D. Prokoshkin ◽  
G.A. Markossian ◽  
E.P. Tarutta ◽  
...  
Keyword(s):  
Shape Memory ◽  
High Myopia ◽  
Memory Device

scholarly journals ELEMENTS OF STRUCTURE CALCULATION FOR SHAPE MEMORY DEVICE

1991 ◽  
Vol 01 (C4) ◽  
pp. C4-151-C4-156
Author(s):  
Y. GILLET ◽  
E. PATOOR ◽  
M. BERVEILLER
Keyword(s):  
Shape Memory ◽  
Memory Device ◽  
Structure Calculation

Application of a Shape Memory Absorber in Vibration Suppression

2016 ◽  
Vol 849 ◽  
pp. 27-35 ◽  
Author(s):  
Vinícius Piccirillo ◽  
José M. Balthazar ◽  
Angelo Marcelo Tusset ◽  
Davide Bernardini ◽  
Giuseppe Rega
Keyword(s):  
Shape Memory ◽  
Vibration Suppression ◽  
High Amplitude ◽  
Memory Device ◽  
Internal Variable ◽  
Hysteretic Behavior ◽  
Thermomechanical Model ◽  
Dynamic Vibration Absorber ◽  
Restoring Force ◽  
Dynamic Vibration

The dynamic response of structures subjected to high-amplitude vibration is often dangerous and undesirable. Dynamic vibration absorbers (DVA) have received special attention in recent years due to vibration attenuation offered by them. Thus, the present study analyzes the nonlinear dynamics of a system with a dynamic vibration absorber (DVA) using a shape memory material (SMM) whose characteristics are highly dependent upon temperature. The restoring force of the oscillator is provided by a shape-memory device (SMD) described by a thermomechanical model capable to describe the hysteretic behavior via the evolution of a suitable internal variable. Numerical simulations show the effectiveness of using the SMM in reducing oscillations of a harmonic oscillator.

Tensile Failure of 55-Nitinol Wire

1975 ◽  
Vol 33 ◽  
pp. 46-47
Author(s):  
F. I. Grace
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stoichiometric Composition ◽  
Tensile Failure ◽  
Initial State ◽  
Initial Shape ◽  
Nitinol Wire ◽  
Cscl Type ◽  
Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

TEM study of order, structure and defects of β and martensite in Cu-Al-Mn shape memory alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 188-189
Author(s):  
J.M. Guilemany ◽  
F. Peregrin
Keyword(s):  
Shape Memory ◽  
Orthophosphoric Acid ◽  
Isopropyl Alcohol ◽  
Metastable Phase ◽  
Characteristic Temperature ◽  
Ethanol Solution ◽  
Order Structure ◽  
Thin Foils ◽  
Polycrystalline Alloys ◽  
Diamond Saw

The shape memory effect (SME) shown by Cu-Al-Mn alloys stems from the thermoelastic martensitic transformation occuring between a β (L2,) metastable phase and a martensitic phase. The TEM study of both phases in single and polycrystalline Cu-Al-Mn alloys give us greater knowledge of the structure, order and defects.The alloys were obtained by vacuum melting of Cu, Al and Mn and single crystals were obtained from polycrystalline alloys using a modified Bridgman method. Four different alloys were used with (e/a) ranging from 1.41 to 1.46 . Two different heat treatments were used and the alloys also underwent thermal cycling throughout their characteristic temperature range -Ms, Mf, As, Af-. The specimens were cut using a low speed diamond saw and discs were mechanically thinned to 100 μm and then ion milled to perforation at 4 kV. Some thin foils were also prepared by twin-jet electropolishing, using a (1:10:50:50) urea: isopropyl alcohol: orthophosphoric acid: ethanol solution at 20°C. The foils were examinated on a TEM operated at 200 kV.

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