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Experimental and numerical investigation of thermomechanical cycling of notched NiTi shape memory ribbon using SMA model accounting for plastic deformation
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SYSNO ASEP 0549526 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Experimental and numerical investigation of thermomechanical cycling of notched NiTi shape memory ribbon using SMA model accounting for plastic deformation Author(s) Shayanfard, P. (CZ)
Heller, Luděk (UJF-V) ORCID
Šandera, P. (CZ)
Šittner, Petr (UJF-V) ORCID, RID, SAINumber of authors 4 Source Title Journal of Materials Research and Technology-JMR&T. - : Elsevier - ISSN 2238-7854
Roč. 15, NOV (2021), s. 1759-1776Number of pages 18 s. Publication form Print - P Language eng - English Country BR - Brazil Keywords conventional plasticity ; DIC ; double notched ribbon ; finite element analysis ; martensitic transformation ; plastic deformation ; shape memory alloy actuator ; SMA model ; stress riser ; thermal actuator Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_013/0001794 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000734200100010 EID SCOPUS 85114984610 DOI 10.1016/j.jmrt.2021.08.132 Annotation Shape memory alloys (SMAs) are being increasingly applied as thermally driven actuators. The commercially available SMA elements, however, frequently contain stress risers, either due to internal or surface defects or due to the required component shape. Stress risers represent a potential danger for the preliminary fatigue failure of such actuators but its actual mechanism is not very clear. This paper presents a combined experimental (2D DIC analysis of surface strains) and numerical analysis (SMA model with plastic deformation) of the stress, strain and phase fraction fields evolving in a thin NiTi shape memory ribbon with an artificial notch subjected to cyclic cooling-heating through transformation range under constant external force. It appeared that, even if only very low tensile stress is externally applied upon thermal cycling, local tensile stress at the notch tip sharply increases during the first cooling due to the forward martensitic transformation (MT) proceeding heterogeneously in space. This heterogeneity gives rise to plastic deformation at the notch-tip, which gradually accumulates upon thermal cycling and shields the notch tip from tensile overloading. Hence, fatigue performance of thermal NiTi actuator with stress riser depends very much on the plastic deformability of the alloy. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.jmrt.2021.08.132
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