NDLI: Applicability of Shape Memory Alloy Wire for an Active, Soft Orthotic

Content Provider	Springer Nature Link
Author	Stirling, Leia Yu, Chih Han Miller, Jason Hawkes, Elliot Wood, Robert Goldfield, Eugene Nagpal, Radhika
Copyright Year	2011
Abstract	Current treatments for gait pathologies associated with neuromuscular disorders may employ a passive, rigid brace. While these provide certain benefits, they can also cause muscle atrophy. In this study, we examined NiTi shape memory alloy (SMA) wires that were annealed into springs to develop an active, soft orthotic (ASO) for the knee. Actively controlled SMA springs may provide variable assistances depending on factors such as when, during the gait cycle, the springs are activated; ongoing muscle activity level; and needs of the wearer. Unlike a passive brace, an active orthotic may provide individualized control, assisting the muscles so that they may be used more appropriately, and possibly leading to a re-education of the neuro-motor system and eventual independence from the orthotic system. A prototype was tested on a suspended, robotic leg to simulate the swing phase of a typical gait. The total deflection generated by the orthotic depended on the knee angle and the total number of actuators triggered, with a max deflection of 35°. While SMA wires have a high energy density, they require a significant amount of power. Furthermore, the loaded SMA spring response times were much longer than the natural frequency of an average gait for the power conditions tested. While the SMA wires are not appropriate for correction of gait pathologies as currently implemented, the ability to have a soft, actuated material could be appropriate for slower timescale applications.
Starting Page	658
Ending Page	662
Page Count	5
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	20
Issue Number	4-5
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2011-02-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	gait orthotic shape memory alloy springs Materials Science Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Thermomechanical Modeling of Stress Relaxation in Shape Memory Alloy Wires

Experimental Investigation on the Mechanical Instability of Superelastic NiTi Shape Memory Alloy

Characterization of Polylactide Layer Deposited on Ni-Ti Shape Memory Alloy

Facile Design and Fabrication of Two-Way Shape Memory TiNi Springs with Narrow Hysteresis

Comparison of shape memory effect between casting and forged alloys of Fe14Mn6Si9Cr5Ni

On the Potentials of Shape Memory Alloy Valves

Martensitic Transformation and Shape Memory Effect of NiCoMnSn High Temperature Shape Memory Alloy

Compressive training of the shape memory alloy washer

Theoretical and Experimental Investigation on SMA Superelastic Springs

Applicability of Shape Memory Alloy Wire for an Active, Soft Orthotic

Similar Documents

Thermomechanical Modeling of Stress Relaxation in Shape Memory Alloy Wires

Experimental Investigation on the Mechanical Instability of Superelastic NiTi Shape Memory Alloy

Characterization of Polylactide Layer Deposited on Ni-Ti Shape Memory Alloy

Facile Design and Fabrication of Two-Way Shape Memory TiNi Springs with Narrow Hysteresis

Comparison of shape memory effect between casting and forged alloys of Fe14Mn6Si9Cr5Ni

On the Potentials of Shape Memory Alloy Valves

Martensitic Transformation and Shape Memory Effect of NiCoMnSn High Temperature Shape Memory Alloy

Compressive training of the shape memory alloy washer

Theoretical and Experimental Investigation on SMA Superelastic Springs

Applicability of Shape Memory Alloy Wire for an Active, Soft Orthotic