Experimental Observations for Shape Memory Alloys and Transformation Induced Plasticity Phenomena

Gautier, E.; Patoor, Étienne

doi:10.1007/978-3-7091-2660-8_3

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…It is the closest oriented regarding the loading direction. Since no interaction occurs between grains (there is only one grain with a unique crystallographic orientation), single crystal SMAs show higher transformation strains than polycrystalline SMAs [14,15]. As a result, the single crystal CuAlBe SMA allows reaching higher strain level (10%-12%) than the conventional polycrystalline NiTi used in endodontics (4%-6%) [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of penetration/removal response of endodontic instrument made of single crystal Cu-based SMA: comparison with NiTi SMA instruments

Vincent

Xolin

Gevrey

et al. 2017

Smart Mater. Struct.

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This paper presents an experimental and numerical study showing that single crystal shape memory alloy (SMA) Cu-based endodontic instruments can lead to equivalent mechanical performances compared to NiTi-based instruments besides their interesting biological properties. Following a previous finite element analysis (FEA) of single crystal CuAlBe endodontic instruments (Vincent et al 2015 J. Mater. Eng. Perform. 24 4128–39), prototypes with the determined geometrical parameters were machined and experimentally characterized in continuous rotation during a penetration/removal (P/R) protocol in artificial canals. The obtained mechanical responses were compared to responses of NiTi endodontic files in the same conditions. In addition, FEA was conducted and compared with the experimental results to validate the adopted modeling and to evaluate the local quantities inside the instrument as the stress state and the distribution of volume fraction of martensite. The obtained results highlight that single crystal CuAlBe SMA prototypes show equivalent mechanical responses to its NiTi homologous prototypes in the same P/R experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of penetration/removal response of endodontic instrument made of single crystal Cu-based SMA: comparison with NiTi SMA instruments

Vincent

Xolin

Gevrey

et al. 2017

Smart Mater. Struct.

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“…In these alloys, austenite first transforms into a trigonal structure called the R-phase, and then by the reduction of the temperature, it changes into martensite. Three ways exist for achieving the sequential transformation of austenite-R-martensite: addition of a third element such as Fe, aging of the alloys with a higher Ni content and cold work [33].…”

Section: Mechanism Of Shape Memory Effect In Alloysmentioning

confidence: 99%

Self-expanding stents based on shape memory alloys and shape memory polymers

Omid

Goudarzi

Kangarshahi

et al. 2020

jcc

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A stenotic vessel can be opened using net-shape tubes called "stents" leading to the restoration of the bloodstream.Compared to the commonly used stainless steel stent, self-expandable stents have some advantages. They do not suffer from the risks of damage to the vascular tissue due to the balloon expansion. Moreover, overexpansion for compensating the elastic recoil is not needed, and there is no constant force applied on the artery until the occlusion of the device by the artery stops. However, the stent cannot restore the original dimensions of the vessel in the case of calcified plaques. Self-expandable stents can be utilized for the treatment of atherosclerotic lesions in the carotid, coronary, and peripheral arteries. Shape memory alloys (SMAs), mainly NiTi (nitinol), are employed for self-expandable vascular stent applications. Nitinol is widely applied for medical devices and implants due to its excellent fatigue performance, mechanical properties, and biocompatibility, which make this alloy suitable for long-term installations. Other materials used for self-expandable cardiovascular stents are shape memory polymers (SMPs). Shape memory effect is triggered by the hydration of polymers or temperature change preventing the collapse of small blood vessels. This review has focused on the mechanisms and properties of SMAs and SMPs as promising materials for stent application.

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“…Three-dimensional analysis, that is, finite element analysis (FEA), has been performed on most proposed forms, even considering such complexities as martensitic reorientation (Arghavani et al, 2010; Marketz and Fischer, 1996; Panico and Brinson, 2007; Thamburaja, 2005), porosity (Entchev and Lagoudas, 2002; Panico and Brinson, 2008), full thermal coupling (Morin et al, 2011; Nae et al, 2003), plasticity (Hartl and Lagoudas, 2009; Peng et al, 2012; Saint-Sulpice et al, 2009), visco-plasticity (Chemisky et al, 2014; Hartl et al, 2010), anisotropy (Sedlák et al, 2012), and finite strain (Panoskaltsis et al, 2014). Motivation for these analysis studies has included experimental interpretation (Gautier and Patoor, 1997; Nohouji et al, 2014; Rejzner et al, 2002), analysis-driven iterative design (Bhattacharyya et al, 1995; Chemisky et al, 2009; Godard et al, 2003; Jardine et al, 1997; Seeley and Chattopadhyay, 1993; Strelec et al, 2003; Troisfontaine et al, 1999), and topology optimization (Langelaar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Efficiency and effectiveness of implicit and explicit approaches for the analysis of shape-memory alloy bodies

Scalet

Auricchio

Hartl

2015

Journal of Intelligent Material Systems and Structures

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The increasing number of applications incorporating shape-memory alloy (SMA) components motivates the development of three-dimensional constitutive models to enhance their analysis and design. These models only reach their full utility if they are then implemented into numerical (e.g. often finite-element-based) frameworks. The present article addresses a topic rarely considered in the myriad of SMA computational analysis works in the literature: the analysis of the time and accuracy of implementation options. In particular, this work proposes to compare the performance of the implicit and explicit integration methods for two common three-dimensional phenomenological constitutive models: (i) the model by Lagoudas et al.; and (ii) the model by Auricchio et al. available in all installations of Abaqus. In doing so, the present work develops and implements an explicit algorithm for the model by Lagoudas et al. for the first time. The investigated models are compared in a chosen benchmark boundary value problem analysis considering both thermally induced actuation and isothermal stress-induced transformation of an SMA beam. The performance of the methods in terms of analysis time and parallelization efficiency are also investigated.

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Experimental Observations for Shape Memory Alloys and Transformation Induced Plasticity Phenomena

Cited by 6 publications

References 37 publications

Experimental and numerical analysis of penetration/removal response of endodontic instrument made of single crystal Cu-based SMA: comparison with NiTi SMA instruments

Experimental and numerical analysis of penetration/removal response of endodontic instrument made of single crystal Cu-based SMA: comparison with NiTi SMA instruments

Self-expanding stents based on shape memory alloys and shape memory polymers

Efficiency and effectiveness of implicit and explicit approaches for the analysis of shape-memory alloy bodies

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