Progress of application, research and development, and design guidelines for shape memory alloy devices for cultural heritage structures in Italy

2001 ◽  
Author(s):  
Maria G. Castellano ◽  
Maurizio Indirli ◽  
Alessandro Martelli
Keyword(s):  
Shape Memory Alloy ◽  
Research And Development ◽  
Cultural Heritage ◽  
Shape Memory ◽  
Design Guidelines ◽  
Application Research

Exploration of Magnetically Controlled Shape Memory Alloy Vibration Energy Harvestor

2013 ◽  
Vol 336-338 ◽  
pp. 1041-1044 ◽  
Author(s):  
Qing Xin Zhang ◽  
Hui Yang Yu ◽  
Yu Huan Xie
Keyword(s):  
Power Generation ◽  
Shape Memory Alloy ◽  
Research And Development ◽  
Shape Memory ◽  
Status Quo ◽  
Vibration Energy ◽  
Development Status ◽  
The Status ◽  
Energy Acquisition ◽  
Generation Power

This paper first introduces the research and development status of Magnetically Controlled Shape Memory Alloy and analysis its application in the vibration energy harvestor; next lists several typical vibration energy harvestors, describes the principle of power generation, power generation, and research of them; then makes a study of the status quo of the MSMA energy acquisition, describes the difficulties finally, challenges and trends faced with the MSMA vibration energy harvestor.

Conglomerate Stabilization Curve Design Method for Shape Memory Alloy Wire Actuators With Cyclic Shakedown

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
WonHee Kim ◽  
Brian M. Barnes ◽  
Jonathan E. Luntz ◽  
Diann E. Brei
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Design Method ◽  
Mechanical Strain ◽  
High Energy ◽  
Design Guidelines ◽  
High Energy Density ◽  
Interface Position ◽  
Curve Design ◽  
Actuation Strain

The high energy density actuation potential of shape memory alloy (SMA) wire is tempered by conservative design guidelines set to mitigate complex factors such as functional fatigue (shakedown). In addition to stroke loss, shakedown causes practical problems of interface position drift between the system and the SMA wire under higher stress levels if the wire does not undergo a pre-installation shakedown procedure. Constraining actuation strain eliminates interface position drift and has been reported to reduce shakedown as well as increase fatigue life. One approach to limit actuation strain is using a mechanical strain limiter, which sets a fixed Martensite strain position—useful for the development of in-device shakedown procedures, which eliminates time-consuming pre-installation shakedown procedures. This paper presents a novel conglomerate stabilization curve design method for SMA wire actuators, which accounts for shakedown with and without the use of mechanical strain limiters to enable higher stress designs to maximize actuator performance. Shakedown experimental data including the effect of strain limiters along with stroke and work density contours form the basis for this new design method. For each independent mechanical strain limiter, the maximum of the individual postshakedown Austenite curves at a range of applied stress are combined into a conglomerate stabilization design curve. These curves over a set of mechanical strain limiters including the zero set provide steady-state performance prediction for SMA actuation, effectively decoupling the shakedown material performance from design variables that affect the shakedown. The use and benefits of the conglomerate stabilization curve design method are demonstrated with a common constant force actuator design example, which was validated in hardware on a heavy duty latch device. This new design method, which accounts for shakedown, supports design of SMA actuators at higher stresses with more economical use of material/power and enables the utilization of strain limiters for cost-saving in-device shakedown procedures.

Progress on Study and Application of Shape Memory Alloy in Passive Energy Dissipation

2012 ◽  
Vol 198-199 ◽  
pp. 3-8
Author(s):  
Yu Hong Ling ◽  
Hong Hua Ling
Keyword(s):  
Energy Dissipation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Structural Vibration ◽  
Application Research ◽  
Structural Vibration Control ◽  
The Past ◽  
Passive Energy Dissipation ◽  
Passive Devices ◽  
Unique Shape

Shape memory alloy (SMA) has a good application prospect in structural vibration control due to its unique shape memory effect and superelasticity. First, the characteristics of SMA is briefly introduced. This paper then reviews research results on SMA for passive energy dissipation in the past decades, including development of different mechanisms of SMA-based passive devices and their performance tests and application research. Finally, application of SMA for passive energy dissipation is prospected.

scholarly journals Use the Force: Review of High-Rate Actuation of Shape Memory Alloys

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 140
Author(s):  
Asaf Dana ◽  
Shahaf Vollach ◽  
Doron Shilo
Keyword(s):  
Energy Efficiency ◽  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Electric Pulse ◽  
Design Guidelines ◽  
Experimental Results ◽  
High Rate ◽  
Accurate Design ◽  
Typical Shape

Typical shape memory alloy actuators provide a unique combination of large stresses and strains that result in work-per-volume larger by more than two orders of magnitude than all other actuation methods that are based on active materials. High-rate actuation of shape memory alloys can provide improved energy efficiency, and shorter response and total actuation times, along with large travel-per-wire-length, with respect to slow-rate SMA applications. In this article, we review the different aspects of high-rate actuation of shape memory alloy wires in the high-driving-force regime. We briefly survey previous experimental results about the kinetics and thermodynamics of the phase transformation in view of its practical implications. New experimental results, regarding energy efficiency, total actuation time, repeatability, and fatigue, are presented and discussed. The paper provides general design guidelines for obtaining high actuator performance, as well as guidelines for selecting the source of the electric pulse and its parameters. Finally, we construct and solve detailed simulations of actuator response that can serve as accurate design tools.

Structure and mobility of martensite variant interfaces in a Cu-Zn-AI shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 519-522 ◽  
Author(s):  
W. Cai ◽  
J. X. Zhang ◽  
Y. F. Zheng ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensite Variant
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