Thermo-mechanical properties of snake-like NiTi wires and their use in miniature devices

Nespoli, Adelaide; Villa, Elena; Besseghini, Stefano
July 2012
Journal of Thermal Analysis & Calorimetry;Jul2012, Vol. 109 Issue 1, p39
Academic Journal
In this study, we present the thermo-mechanical characterization of snake-like shape memory alloy (SMA) NiTi wires. Several samples were formed at different thermal treatments and analyzed through calorimetry and thermo-mechanical tests. It was found that for small deformations the snake-like SMA wire behaves as a quasi-elastic material, presenting the flag-shape pseudoelastic behavior at high thermal treatment temperatures. The mechanical performance seems to depend basically on the snake geometry instead on the thermal treatment; only for the 773 K treatment sample the performance rapidly gets worse. Stabilization is reached in few cycles. After the thermo-mechanical characterization, we studied the performance of the snake-like SMA wire mounted in a miniature rotational actuator, suggesting an innovative application in the actuator field.


Related Articles

  • Thermomechanical Forming of NiTi Shape Memory Alloy Wire. Kuang-Jau Fann; Hau-Chi Hsu // Advanced Materials Research;2014, Issue 939, p430 

    Because of their smart characteristics with shape memory effect and superelasticity, NiTi shape memory alloys used in sensors and actuators are regarded as an emerging applied material with high added value by their additional biomedical compatibility for medical devices and implants. It is...

  • Transients and Evolution in NiTi. Padula, S.; Gaydosh, D.; Saleeb, A.; Dhakal, B. // Experimental Mechanics;Jun2014, Vol. 54 Issue 5, p709 

    Many of the applications that seek to utilize shape memory alloys for their unique set of properties inevitably must deal, on some level, with the dimensional instability that is inherent to these materials under cyclic thermomechanical loading conditions. As a result, a better understanding of...

  • Laser and Surface Processes of NiTi Shape Memory Elements for Micro-actuation. Nespoli, Adelaide; Biffi, Carlo; Previtali, Barbara; Villa, Elena; Tuissi, Ausonio // Metallurgical & Materials Transactions. Part A;Apr2014, Vol. 45 Issue 4, p2242 

    In the current microtechnology for actuation field, shape memory alloys (SMA) are considered one of the best candidates for the production of mini/micro devices thanks to their high power-to-weight ratio as function of the actuator weight and hence for their capability of generating high...

  • Application of Thermomechanically Treated Ti-Ni SMA. Khmelevskaya, Irina; Ryklina, Elena; Korotitskiy, Andrey // Materials Science Foundations;2015, Vol. 81/82, p603 

    The main fields of the practical application of Ti-Ni-based alloys, with shape memory and superelasticity effects, in engineering and medicine, have been identified in the past decade. There are temperature-sensitive elements for the actuators, damping devices, fasteners, medical instruments and...

  • Fatigue of NiTi for dampers and actuators. Isalgue, Antonio; Torra, Vicenç; Casciati, F.; Casciati, S. // Advances in Science & Technology;2013, Vol. 83, p18 

    The application of Shape Memory Alloy (SMA) devices to practical uses need well established performance. The reliable application in some areas, as dampers in engineering, needs a known, relatively long fatigue life (some million oscillations). The thermomechanical properties of SMA, based on...

  • NONDESTRUCTIVE EVALUATION OF NI-TI SHAPE MEMORY ALLOY. Meir, S.; Gordon, S.; Karsh, M.; Wiezman, A.; Ayers, R.; Olson, D. L. // AIP Conference Proceedings;6/23/2011, Vol. 1335 Issue 1, p1208 

    The nondestructive evaluation of nickel titanium (Ni-Ti) alloys for applications such as heat treatment for biomaterials applications (dental) and welding was investigated. Ni-Ti alloys and its ternary alloys are valued for mechanical properties in addition to the shape memory effect. Two...

  • Textile Materials with SMA Elements for Active Protection against Heat and Flame. BARTKOWIAK, GRAŻYNA; DĄBROWSKA, ANNA // Advances in Science & Technology;2017, Vol. 100, p11 

    The latest research directions related to the design of protective clothing concern implementation of smart materials, such as shape memory alloys (SMA), that allow for its functionalization which could not be achieved with traditional materials. As a result of the research project, a...

  • Nanocrystallization of the TiNiCo Shape Memory Alloy by Thermomechanical Treatment. Mohammad Sharifi, E.; Karimzadeh, F.; Kermanpur, A. // Journal of Materials Engineering & Performance;Jan2015, Vol. 24 Issue 1, p445 

    The microstructural evolution during nanostructuring of the TiNiCo shape memory alloy by thermomechanical processing is investigated. The high purity ingots were fabricated by a copper boat vacuum induction melting technique. The differential scanning calorimetry measurements showed that the...

  • Application of Ni-Ti shape memory alloy actuators in a walking micro-robot. Doroftei, I.; Stirbu, B. // Mechanika;2014, Vol. 20 Issue 1, p70 

    As walking robots are requested to perform tasks in rough terrain, the development of actuators capable to flexibly adapt to the unstructured environment becomes more and more necessary. The conventional mechanisms with stiff joints make the robots more complex, heavy, large and expensive. Shape...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics