Cyclic super elasticity in shape memory alloys (SMAs) is governed by complex transformation mechanisms that evolve under repeated loading, yet these stabilization effects remain insufficiently resolved at the full-field scale. This work presents an experimental investigation of the cyclic superelastic response of Nitinol subjected to 77 loading cycles, with particular emphasis on the progression of stress-induced martensitic transformation. High-resolution digital image correlation (DIC) was employed to capture in-situ strain localization and the corresponding evolution of transformation morphology. The full-field measurements reveal distinct changes in transformation band formation, propagation, and recovery as cyclic stabilization develops. Local strain evolution was further analyzed to elucidate micromechanical deformation pathways that influence functional fatigue behavior. The results provide new insight into the spatially heterogeneous deformation characteristics of Nitinol under cyclic superelastic loading, offering experimentally grounded evidence critical for advancing intelligent material systems and their reliability in repetitive actuation or structural applications.
BianXSalehAAPerelomaEV, et al. (2018) A digital image correlation study of a NiTi alloy subjected to monotonic uniaxial and cyclic loading-unloading in tension. Materials Science and Engineering A726: 102–112. https://doi.org/10.1016/j.msea.2018.04.081
2.
BoucharebNFellahMHezilN, et al. (2026) A review of nitinol shape memory alloys for biomedical applications: Advancements and biocompatibility. JOM78: 140–167. https://doi.org/10.1007/s11837-025-07932-9
3.
ChenJLiuFFangG, et al. (2025a) Intermittent healing for alleviating the functional fatigue and restoration of the elastocaloric effect in superelastic NiTi shape memory alloy. Journal of Material Science and Technology227: 289–303. https://doi.org/10.1016/j.jmst.2024.11.071
4.
ChenJWangWLiuF, et al. (2025b) Functional fatigue and restoration in superelastic NiTi shape-memory alloys. International Journal of Plasticity194. https://doi.org/10.1016/j.ijplas.2025.104483
5.
DavarniaDChengSVan EngelenN (2025) Mechanical behavior of NiTi shape memory alloy under cyclic loading: A state-of-the-art review. Frontiers of Structural and Civil Engineering19: 1041–1060. https://doi.org/10.1007/s11709-025-1195-2
6.
DilibalS (2013) Investigation of nucleation and growth of detwinning mechanism in martensitic single crystal NiTi using digital image correlation. Metallography Microstructure and Analysis2: 242–248. https://doi.org/10.1007/s13632-013-0083-7
7.
DilibalSHamiltonRFLanbaA (2017) The effect of employed loading mode on the mechanical cyclic stabilization of NiTi shape memory alloys. Intermetallics89: 1–9. https://doi.org/10.1016/j.intermet.2017.05.014
8.
EggelerGHornbogenEYawnyA, et al. (2004) Structural and functional fatigue of NiTi shape memory alloys. Materials Science and Engineering A378(1–2): 24–33. https://doi.org/10.1016/j.msea.2003.10.327
9.
ElahiniaMShayesteh MoghaddamNMTaheri Andani, et al. (2016) Fabrication of NiTi through additive manufacturing: A review. Progress in Materials Science83: 630–663. https://doi.org/10.1016/j.pmatsci.2016.08.001
10.
EngebergEDDilibalSVataniM, et al. (2015) Anthropomorphic finger antagonistically actuated by SMA plates. Bioinspiration & Biomimetics10(5): 056002. https://doi.org/10.1088/1748-3190/10/5/056002
11.
HartlDJLagoudasDC (2007) Aerospace applications of shape memory alloys. Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering221(4): 535–552. https://doi.org/10.1243/09544100jaero211
12.
JoulaMDilibalSMafratogluG, et al. (2022) Hybrid battery thermal management system with NiTi SMA and phase change material (PCM) for Li-ion batteries. Energies15(12): 4403. https://doi.org/10.3390/en15124403
13.
LanbaAHamiltonRF (2015) The impact of martensite deformation on shape memory effect recovery strain evolution. Metallurgical and Materials Transactions A46(8): 3481–3489. https://doi.org/10.1007/s11661-015-2943-z
14.
LanbaASabirovTMelansonA, et al. (2025) Enhanced two-dimensional super elasticity in a laser micromachined auxetic nitinol geometry. Materials & Design252: 257. https://doi.org/10.1016/j.matdes.2025.113793
15.
LiBLiuXHeT, et al. (2024) Temperature and strain-rate dependence of the superelastic response in EBF3-fabricated and post-heat-treated NiTi shape memory alloy. Journal of Materials Research and Technology28: 3775–3780. https://doi.org/10.1016/j.jmrt.2024.01.010
16.
LinMVataniMChoiJW, et al. (2020) Compliant underwater manipulator with integrated tactile sensor for nonlinear force feedback control of an SMA actuation system. Sensors and Actuators A Physical315: 112221. https://doi.org/10.1016/j.sna.2020.112221
17.
MiyazakiSImaiTIgoY, et al. (1986) Effect of cyclic deformation on the pseudo elasticity characteristics of Ti-Ni alloys. Metallurgical Transactions17: 115–120. https://doi.org/10.1007/bf02644447
18.
NargattiKAhankariS (2022) Advances in enhancing structural and functional fatigue resistance of superelastic NiTi shape memory alloy: A review. Journal of Intelligent Material Systems and Structures33(4): 503–531. https://doi.org/10.1177/1045389X211023582
19.
ReedlunnBDalySHectorL, et al. (2013) Tips and tricks for characterizing shape memory wire part 5: Full-field strain measurement by digital image correlation. Experimental Techniques37: 62–78. https://doi.org/10.1111/j.1747-1567.2011.00717.x
20.
RodinòSMalettaC (2024) Design considerations and applications of shape memory alloy-based actuation in morphing structures: A systematic review. Progress in Engineering Science1(4): 100021. https://doi.org/10.1016/j.pes.2024.100021
21.
SabirovTDilibalSLanbaA, et al. (2026) Calorimetric energetics and localized strain recovery in electron beam powder-bed fusion built NiTi shape memory alloy. Materials Today Communications52: 114948. https://doi.org/10.1016/j.mtcomm.2026.114948
22.
SedmákPPilchJHellerL, et al. (2016) Grain-resolved analysis of localized deformation in nickel-titanium wire under tensile load. Science353(6299): 559–562. https://doi.org/10.1126/science.aad6700
23.
ShariatBSLiYYangH, et al. (2022) On the Lüders band formation and propagation in NiTi shape memory alloys. Journal of Material Science and Technology116: 22–29. https://doi.org/10.1016/j.jmst.2021.11.028
ShuaiJXiaoY (2020) In-situ study on texture-dependent martensitic transformation and cyclic irreversibility of superelastic NiTi shape memory alloy. Metallurgical and Materials Transactions A51: 562–567. https://doi.org/10.1007/s11661-019-05563-9
26.
SidharthRMohammedASKSehitogluH (2022) Functional fatigue of NiTi shape memory alloy: Effect of loading frequency and source of residual strains. Shape Memory and Super elasticity8(4): 394–412. https://doi.org/10.1007/s40830-022-00397-8
27.
SongDGongSXuB, et al. (2025) Cyclic functional degradation of NiTi shape memory alloy wires in wide ranges of strain rate and ambient temperature. International Journal of Fatigue191: 108683. https://doi.org/10.1016/j.ijfatigue.2024.108683
28.
XiaoYChenDJiangT, et al. (2024) Transformation pattern of shape-memory NiTi alloy during stress-biased thermal cycling. European Journal of Mechanics - A/Solids107: 105393. https://doi.org/10.1016/j.euromechsol.2024.105393
29.
XiaoYJiangD (2020) Constitutive modelling of transformation pattern in superelastic NiTi shape memory alloy under cyclic loading. International Journal of Mechanical Sciences182: 105743. https://doi.org/10.1016/j.ijmecsci.2020.105743
30.
XiaoYJiangD (2022) Thermomechanical modeling on cyclic deformation and localization of superelastic NiTi shape memory alloy. International Journal of Solids and Structures250: 259. https://doi.org/10.1016/j.ijsolstr.2022.111723
31.
XueDZuoQPanY, et al. (2024) Design of shape memory alloys with low hysteresis via multiple phase coexistence. Applied Physics Letters125(11): 112201. https://doi.org/10.1063/5.0206923
32.
ZhangYChaiXJuX, et al. (2023) Concentration of transformation-induced plasticity in pseudo elastic NiTi shape memory alloys: Insight from austenite–martensite interface instability. International Journal of Plasticity160: 103481. https://doi.org/10.1016/j.ijplas.2022.103481
33.
ZhangYYouYMoumniZ, et al. (2017) Experimental and theoretical investigation of the frequency effect on low cycle fatigue of shape memory alloys. International Journal of Plasticity90: 1–30. https://doi.org/10.1016/j.ijplas.2016.11.012
34.
ZhaoZJiangDXiaoY, et al. (2023a) Intrinsic response of nanocrystalline superelastic NiTi shape memory alloy. Extreme Mechanics Letters60: 101988. https://doi.org/10.1016/j.eml.2023.101988
35.
ZhaoZXiaoYLinJ, et al. (2023b) The roles of residual martensite and plastic deformation in thermomechanically coupled functional degradation of nanocrystalline superelastic NiTi alloys. Journal of Materials Research and Technology24: 6791–6807. https://doi.org/10.1016/j.jmrt.2023.05.011
36.
ZotovNPfundMPolatidisE, et al. (2017) Change of transformation mechanism during pseudo elastic cycling of NiTi shape memory alloys. Materials Science and Engineering A682: 178–191. https://doi.org/10.1016/j.msea.2016.11.052
