Load–Displacement Behavior of Helical Shape Memory Alloy Spring Actuators with Small Spring Diameter to Wire Diameter Ratios

2020 ◽  
Vol 6 (3) ◽  
pp. 301-310
Author(s):  
Ryan Puchaty ◽  
Giovanni De Vita ◽  
Raj Vaidyanathan
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Wire Diameter ◽  
Displacement Behavior ◽  
Load Displacement

Flexure-Based Active Needle for Enhanced Steering Within Soft Tissue

2015 ◽  
Vol 9 (4) ◽  
Author(s):  
Naresh V. Datla ◽  
Parsaoran Hutapea
Keyword(s):  
Soft Tissue ◽  
Shape Memory Alloy ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Torsional Rigidity ◽  
Axial Rotation ◽  
Needle Insertion ◽  
Wire Diameter ◽  
Pig Liver ◽  
Target Locations

Flexible needles with enhanced steerability are desired in minimally invasive surgeries to reach target locations precisely and to bypass critical organs lying in the planned path. We have proposed a flexure-based active needle that enhances steerability by using a flexure element near the needle tip. Needle curvature is controlled by attached shape memory alloy (SMA) wires that apply actuator forces to bend the needle. Using actuator forces rather than axial rotation to control needle curvature minimizes placement errors due to torsional rigidity that is compromised by the flexure element. A prototype of the proposed needle was developed and was demonstrated in air, in tissue-mimicking gel, and in pig liver. Needle insertion studies with the prototype showed that increasing the wire diameter from 0.15 to 0.24 mm insignificantly affected the maximum needle tip deflection (19.4±0.3 mm for 150 mm insertion), but significantly increased the actuation current (from 0.60 to 1.04 A).

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

Compression Experiment and Simulation Study of Shape Memory Alloy Lattice Structure

2019 ◽  
Author(s):  
Osuke Ishida ◽  
Junichi Kitada ◽  
Katsuhiko Nunoani ◽  
Kiyoshi Uzawa
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Simulation Study ◽  
Lattice Structure ◽  
Experiment And Simulation

Analysis of the effect of Heat Treatments in the manufacturing process of Shape Memory Alloy Springs

2017 ◽  
Author(s):  
Ricardo Alexandre Amar de Aguiar ◽  
Pedro Manuel Calas Lopes Pacheco ◽  
Brenno Tavares Duarte
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Manufacturing Process ◽  
Heat Treatments

Comparative Analysis of a Tuned Mass Damper Using Steel and a Ni-Ti Shape Memory Alloy

2019 ◽  
Author(s):  
Marcelio Ronnie Dantas de Sá ◽  
Armando Wilmans Nunes da Fonseca Júnior ◽  
Yuri Moraes ◽  
Antonio Almeida Silva
Keyword(s):  
Comparative Analysis ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Tuned Mass Damper ◽  
Mass Damper

Shape memory alloy actuator: modeling improvements and position control using a temperature inner loop

2018 ◽  
Author(s):  
Thiago Barbosa ◽  
Jés de Jesus Fiais Cerqueira ◽  
Antonio Marcus Nogueira Lima
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Position Control ◽  
Shape Memory Alloy Actuator
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