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

Shayanfard, Pejman; Heller, Luděk; Šandera, Pavel; Šittner, Petr

doi:10.1016/j.jmrt.2021.08.132

Cited by 4 publications

(2 citation statements)

References 88 publications

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“…In order to analyze the mechanical response of the NiTi superelastic male attachment part the evolution of the martensite phase fraction and local stress magnitude under multiaxial loading occurring as a consequence of mastication seemed to be important. To that end, a three-dimensional mathematical phenomenological SMA model proposed by Choudhry and Yoon [30], which has also been numerically implemented in the MSC Marc finite element software and which has also been comprehensively outlined in the supplementary material of Ref [31] was used. This model's capabilities include capturing phase transformation between the austenite and martensite phases, as well as the tensioncompression asymmetry in SMAs by the Conical Drucker approach.…”

Section: Finite Element Simulation Methodsmentioning

confidence: 99%

Design and Numerical-Method-Aided Optimization of a Novel Attachment System for Implant-Retained Dental Prostheses Using NiTi Shape Memory Alloys

et al. 2022

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While nickel-titanium (NiTi) is the primary shape memory alloy (SMA) used in endodontic instruments, restorative dental components so far have not been fabricated from SMAs. The flexibility of these materials may solve problems in implant prosthodontics resulting from non-parallel implant positions and transfer inaccuracies. Based on a prototype of a novel attachment system for implant overdentures, a finite element model was created and used for studying different loading situations and design parameters followed by numerical analysis aided design optimization. The results revealed that the basic design of the attachment is capable of compensating misalignments of supporting implants as well as transfer inaccuracies of a clinically relevant magnitude by accommodating the large deformations induced under masticatory loading upon martensitic phase transformation at almost constant stress. The application of NiTi resulted in the reduction of the reaction forces recorded in the surrounding of the supporting implant, as well, the reaction forces between male and female parts of the attachment system could be reduced which will minimize wear phenomena and subsequent maintenance costs. These effects were seen to be enhanced in the optimized design.

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Section: Finite Element Simulation Methodsmentioning

confidence: 99%

Design and Numerical-Method-Aided Optimization of a Novel Attachment System for Implant-Retained Dental Prostheses Using NiTi Shape Memory Alloys

et al. 2022

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“…On the other hand, NiTi alloys may deform plastically in service, for example, during superelastic [6] and actuator [7] cycling, when superelastic NiTi stent is crimped into delivery tube [8], during shape setting [9] or, generally, when deformed NiTi element is heated far above 100 °C under external constraint [10]. Plastic deformation may also appear locally at stress concentrators-e.g., when cracks propagate during thermal actuation [11]. Plastic deformation frequently accompanies martensitic transformation, introduces irrecoverable strains, lattice defects, and internal stress into the austenitic microstructure [12] and affects functional thermomechanical properties of NiTi components.…”

Section: Introductionmentioning

confidence: 99%

Localized Plastic Deformation of Superelastic NiTi Wires in Tension

Kadeřávek

Šittner

Molnárová

et al. 2023

Shap. Mem. Superelasticity

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Tensile deformation of superelastic NiTi shape memory alloy wires at temperatures above austenite finish temperature proceeds via stress-induced martensitic transformation followed by plastic deformation of oriented martensite. While superelastic deformation tends to proceed in localized manner, plastic deformation of martensite is considered to be homogeneous. In this work, we have investigated strain localization patterns in tensile tests on superelastic NiTi wires deformed until fracture in wide temperature range from 10 to 400 °C using in situ digital image correlation analysis of local strains and analyzed lattice defects created during the deformation in TEM. We have found that plastic deformation of oriented martensite can be either homogeneous or localized, depending on the yield stress and strain hardening rate (on the Considere criterion for stability of tensile deformation). Plastic deformation of martensite proceeds via peculiar deformation mode involving combination of deformation twinning and dislocation-based kinking. Strain localization takes the form of either necking leading to wire fracture at 13–15% strain or via propagation of macroscopic deformation band fronts at constant stress. Regardless the deformation is homogeneous or localized, plastic strains at fracture reach ~ 50%. Strain localized within the propagating band front as large as ~ 40% was observed in tensile tests test on NiTi wires having specific microstructures (grain size ~ 230 nm) in a narrow temperature range (~ 10–60 °C).

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A deep insight of re-entrant martensitic transformation mechanism in Co2Cr(Ga,Si) shape memory alloys

Zhao,

et al. 2024

Journal of Alloys and Compounds

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

Cited by 4 publications

References 88 publications

Design and Numerical-Method-Aided Optimization of a Novel Attachment System for Implant-Retained Dental Prostheses Using NiTi Shape Memory Alloys

Design and Numerical-Method-Aided Optimization of a Novel Attachment System for Implant-Retained Dental Prostheses Using NiTi Shape Memory Alloys

Localized Plastic Deformation of Superelastic NiTi Wires in Tension

A deep insight of re-entrant martensitic transformation mechanism in Co2Cr(Ga,Si) shape memory alloys

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