A comparison of the DSC measurements of shape memory alloys and the material's thermal characteristics in a large scale actuator

2006 ◽  
Author(s):  
James H. Mabe ◽  
Chin-Jye Yu ◽  
Ed Rosenzweig
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Large Scale ◽  
Thermal Characteristics ◽  
Dsc Measurements

Design of a Large-Scale High-Lift Morphing A320 Wing Based on Electro-Mechanical Actuators and Shape Memory Alloys

2019 ◽  
Author(s):  
Yannick T. Bmegaptche Tekap ◽  
Alexandre Giraud ◽  
Gurvan Jodin ◽  
Clément Nadal ◽  
Abderahmane Marouf ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Large Scale ◽  
High Lift

scholarly journals Effect of Nb Content in the Microstructural and Thermal Characteristics of NiTiNb Shape Memory Alloys

2019 ◽  
Vol 22 (suppl 1) ◽  
Author(s):  
Maria Eurenice Rocha Cronemberger ◽  
Vitória Honorato Franco Menezes ◽  
Rodrigo da Silva ◽  
Ícaro G.R. Santos ◽  
Vitor L. Sordi ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thermal Characteristics ◽  
Nb Content

scholarly journals Study of Shape Memory Alloys and the Phase Transition by DMTA and DSC Measurements

2015 ◽  
Vol 602 ◽  
pp. 012024
Author(s):  
Kis Dávid ◽  
Béres Gábor ◽  
Dugár Zsolt ◽  
Hansághy Pál
Keyword(s):  
Phase Transition ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Dsc Measurements

Thermal cycling effects in high temperature Cu–Al–Ni–Mn–B shape memory alloys

1997 ◽  
Vol 12 (9) ◽  
pp. 2288-2297 ◽  
Author(s):  
J. Font ◽  
J. Muntasell ◽  
J. Pons ◽  
E. Cesari
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Parent Phase ◽  
Aluminum Boride ◽  
Transformation Temperatures ◽  
Dsc Measurements ◽  
Number Of Cycles

The effects of thermal cycling through the martensitic transformation have been studied in three Cu–Al–Ni–Mn–B high temperature shape memory alloys. An increase of the martensitic transformation temperatures with the number of cycles (up to ∼7 K after 60 cycles) has been generally observed by DSC measurements. The microstructure of these alloys is rather complicated, with the presence of big manganese or aluminum boride particles and small boron precipitates, as well as the formation of dislocations during thermal cycling. By means of aging experiments, it has been shown that the evolution of transformation temperatures during cycling is mainly due to the step-by-step aging in parent phase accompanying the thermal cycling, and that the dislocations formed during cycling have only a very small effect, at least up to 60 cycles.

Recent Developments on Seismic Resistant Technologies for Accelerated Bridge Construction

2019 ◽  
Author(s):  
Mustafa Mashal ◽  
Alessando Palermo
Keyword(s):  
United States ◽  
New Zealand ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Large Scale ◽  
The United States ◽  
Accelerated Bridge Construction ◽  
Bridge Construction ◽  
Recent Developments ◽  
Seismic Regions

<p>The paper provides an overview of the technologies and connections proposed and tested for accelerated bridge construction (ABC) in seismic regions from New Zealand and the United States in the last seven years. These solutions can be divided in terms of emulative and non‐emulative cast‐in‐place connections. Emulative cast‐in‐place connections aim to achieve a similar seismic performance to that of conventional cast‐in‐place construction during an earthquake. A variety of emulative connections have been tested in New Zealand and in the United States, with some being implemented in actual bridges. These connections include grouted ducts, member socket, pocket, splice‐sleeve, and other connections. Similarly, various non‐emulative connection were tested using large‐scale specimens. These include dissipative controlled rocking, hybrid sliding‐rocking, shape‐memory alloys, and pre‐tensioned rocking. From these, only the dissipative controlled rocking and shape‐memory alloys, have been recently implemented in construction of actual bridges in seismic regions in New Zealand and in the United States, respectively. The paper discusses the aspects associated with emulative and non‐emulative connections.</p>

Alteration of Thermal Characteristics of Polymer for the Purpose of Creating a Two-Stage Shape Memory Polymer

2010 ◽  
Vol 93-94 ◽  
pp. 304-311
Author(s):  
Hirohisa Tamagawa
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Soft Segment ◽  
Shape Memory Polymer ◽  
Thermal Characteristics ◽  
Two Stage ◽  
Dsc Measurements ◽  
Two Distinct Temperatures

A polymer fabricated by mixing PU soft segment and epoxy bore the thermal characteristics of the melting temperature, Tm, of PU soft segment and the glass transition temperature, Tg, of epoxy. The polymer fabricated even exhibited the shape memory effect at the Tg and Tm. Based on this observation, it was speculated that simply mixing two polymers bearing totally different thermal characteristics each other could result in a two-stage SMP, which could exhibit the shape memory effect at the two distinct temperatures. However, it was actually observed that the two-stage SMP was not always successfully created by that method. But DSC measurements revealed that such an unsuccessfully fabricated SMP still bore the thermal characteristics of its ingredient polymers. Hence, the mixing of appropriate polymers still could result in a new two-stage SMP, and the method of two-polymer-mixing must be still an effective method for creating a two-stage SMP.

scholarly journals A Combined Smart-Materials Approach for Next-Generation Airfoils

2016 ◽  
Vol 251 ◽  
pp. 106-112 ◽  
Author(s):  
Johannes Scheller ◽  
Gurvan Jodin ◽  
Karl Joseph Rizzo ◽  
Eric Duhayon ◽  
Jean François Rouchon ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shear Layer ◽  
Analytical Model ◽  
Smart Materials ◽  
Large Scale ◽  
Fiber Composites ◽  
Low Frequencies ◽  
Mission Profile

This article will present a morphing wing actuated using both surface embedded Shape memory alloys (SMAs) and trailing edge Macro-fiber composites (MFCs). This combination enables the airfoil to simultaneously achieve large scale deformations at low frequencies as well as rapid actuation with a limited amount of displacement. Thereby not only can the shape of the airfoil be optimized in function of the current mission profile but also the shear layer can be influenced. Each actuator is modelled using both a finite element and/or an analytical model and the results will be verified experimentally.

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