Experimental and numerical investigation of thermomechanical cycling of notched NiTi shape memory ribbon using SMA model accounting for plastic deformation

0546011 - FZÚ 2022 RIV BR eng J - Journal Article
Shayanfard, Pejman - Heller, Luděk - Šandera, P. - Šittner, Petr
Experimental and numerical investigation of thermomechanical cycling of notched NiTi shape memory ribbon using SMA model accounting for plastic deformation.
Journal of Materials Research and Technology-JMR&T. Roč. 15, Nov (2021), s. 1759-1776. ISSN 2238-7854. E-ISSN 2214-0697
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA20-14114S; GA ČR GA18-03834S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : shape memory alloy actuator * thermal actuator * stress riser * martensitic transformation * plastic deformation * conventional plasticity * SMA model * DIC
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.267, year: 2021
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0322652