Jee, K. K. Han, J. H. Kim, Y. B. Lee, D. H. Jang, W. Y. 2024-01-20T23:30:56Z 2024-01-20T23:30:56Z 2021-09-03 2008-05 1951-6355 https://pubs.kist.re.kr/handle/201004/133523 This work is related to a SMA coil spring which shows perfect recovery and greater recovery force. When tension spring of common metals is fabricated, `initial tension' can be provided by minus pitch winding. The initial tension is the force for tension springs to contract further in closed state. If a SMA spring has the initial tension, perfect recovery is expected with a greater recovery force. However, the initial tension cannot be given to SMA coils in the conventional way, since heat treatment for shape setting eliminates the tension generated by the minus pitch winding. We have developed a new method of supplying the initial tension to SMA springs by changing coil orientation after the shape setting treatment. In this paper, some examples are introduced that a perfect recovery with a greater force, though permanent deformation is involved in the deformation, can be attained by the initial tension. English SPRINGER HEIDELBERG TI-NI ALLOYS PSEUDOELASTICITY New method for improving properties of SMA coil springs Article 10.1140/epjst/e2008-00685-y 1 EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, v.158, pp.261 - 266 EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS 158 261 266 scie scopus 000255543500042 2-s2.0-43049108473 Physics, Multidisciplinary Physics Article TI-NI ALLOYS PSEUDOELASTICITY SMA coil spring recovery initial tension deformation