Application of Ni-Ti shape memory alloy actuators in a walking micro-robot (original) (raw)
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2020 ASEE Virtual Annual Conference Content Access Proceedings
In December 2003, Dr. Hefzy was elevated to the Grade of American Society of Mechanical Engineers (ASME) Fellow in recognition of his outstanding contributions to research and development, to education and leadership in the Engineering Profession. Dr. Hefzy has published with his students more than 40 peer reviewed journal papers and 100 peer reviewed national and international conference papers, and coauthored more than 19 book chapters in his research areas: Orthopedic Biomechanics and Assistive Technology. Dr. Hefzy has secured more than $5 million in funding as a PI, CO-PI, and CI to support his research program, with sponsors including the OBOR, the NSF and the NIH. He has supervised two postdoctoral fellows and has served as primary graduate advisor to more than 30 masters and doctoral students. In addition, he has supervised more than 130 undergraduate senior design projects at UT as part of his community engagement and service learning activities..
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The Shape memory alloys (SMAs) comes under special class of materials which possesses ability to recover their original shape at some temperatures characteristics. The SMAs are being used in different field in variety of applications. This ability of SMA can be viewed under high applied loads and elastic deformations. In this review paper, the SMA actuators and their applications are discussed. Keywords: SMA, Types of SMA, actuator. I. INTRODUCTION The term ''smart alloy'' was introduced in 1932 and the nomenclature ''shape-memory'' was given in 1941 for polymeric dental material [1, 2, 3]. Shape memory alloys (SMAs) are a unique type of material contains the ability to recover their shape at certain temperature characteristics. These materials are able to regain their original shape, even after reaching large inelastic deformations (near 10%) [1]. The demand for SMAs for engineering applications has been increasing in different fields; such as in industrial applications, automobile industries, aerospace applications, structures and composites, robotics and biomedical applications [4, 5]. Different SMA actuators like wire, compression / tension springs and cantilever had been used in thermal and electrical actuation systems [7, 33]. In this paper, a review on different applications of SMA actuators is presented.
Model Equations of Shape Memory Effect-Nitinol
anale-ing.uem.ro
Even it has been already confirmed that SMA's have high potential for robotic actuators, actuators included in space robotics, underwater robotics, robotics for logistics, safety, as well as "green robotics" (robotics for the environment, energy conservation, sustainable development or agriculture), the number of applications of SMA-based actuators is still quite small, especially in applications in which their large strains, high specific work output and structural integration potential are useful,. The paper presents a formulated mathematical model calculated for binary SMA (Ni-Ti), helpful to estimate the stress distribution along with the transformation ratio of a SMA active element.
Indian Journal of Pure & Applied Physics
Soft Robotics is an emerging field due to high degree of freedom, their soft and delicate interaction, almost no vibration during operations etc. are some among many reasons, why scientists and researchers got attracted towards this field. Nitinol is commonly used in soft robotics and easily available Shape Memory Alloy (SMA) actuator. In present investigation, the authors attempted to understand the characteristics and behaviour of Nitinol SMA Actuator wire with change in various parameters such as length, diameter, current, and temperature. Moreover, it is investigated, how resistance, power consumption, force developed, hysteresis, and displacement changing takes place with current passing through the wire and corresponding temperature developed. Various experiments are performed and based on the results and findings related to the selection of wires for specific requirement have been discussed and suggestions were made for the use of the SMA actuator efficiently and effectively.
Nitinol: shape-memory and super-elastic materials in surgery
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Nitinol (Nickel Titanium Naval Ordinance Laboratory), an alloy containing an almost equal mixture of nickel and titanium, was invented in the late 1960s. For many years, it was considered a ''solution in search of a problem.'' It has generated interest in the medical device world only in the past decade, when it became a key component of several revolutionary medical devices including vascular stents, tools, and grafts.
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