Mathematical modelling of pseudoelastic behaviour of tapered NiTi bars

Shariat, Bashir S.; Liu, Yinong; Rio, Gérard

doi:10.1016/j.jallcom.2011.12.151

Cited by 28 publications

(24 citation statements)

References 20 publications

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“…This provides nonuniform transformation initiation in the structure, resulting in the global stress–strain variation to deviate from the original flat stress plateau. The geometrical gradient can be created along the loading direction [10] , [11] or perpendicular to the loading direction [12] .…”

Section: Geometrically Graded Nitimentioning

confidence: 99%

Experiments on deformation behaviour of functionally graded NiTi structures

Shariat

Mahmud

et al. 2017

Data in Brief

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Functionally graded NiTi structures benefit from the combination of the smart properties of NiTi and those of functionally graded structures. This article provides experimental data for thermomechanical deformation behaviour of microstructurally graded, compositionally graded and geometrically graded NiTi alloy components, related to the research article entitled “Functionally graded shape memory alloys: design, fabrication and experimental evaluation” (Shariat et al., 2017) [1]. Stress–strain variation of microstructurally graded NiTi wires is presented at different heat treatment conditions and testing temperatures. The complex 4-way shape memory behaviour of a compositionally graded NiTi strip during one complete thermal cycle is demonstrated. The effects of geometrical design on pseudoelastic behaviour of geometrically graded NiTi plates over tensile loading cycles are presented on the stress–strain diagrams.

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Section: Geometrically Graded Nitimentioning

confidence: 99%

Experiments on deformation behaviour of functionally graded NiTi structures

Shariat

Mahmud

et al. 2017

Data in Brief

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“…To our knowledge, the mechanism of B19′ martensites and R phase transformation in NiTi alloy has been well studied for many years. For example, Liu et al 28293031 have carried out systematic studies on the pseudoelastic behavior of NiTi alloy. However, the deformation behavior of NiTi-Nb brazed NiTi wires is not systematically studied and thus the fundamental understanding of phase transformation and superelasticity in TiNiNb SMAs remains substantially unknown.…”

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confidence: 99%

Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires

Wang

Zhang

Chen

et al. 2016

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NiTi wires were brazed together via eutectic reaction between NiTi and Nb powder deposited at the wire contact region. Phase transformation and deformation behavior of the NiTi-Nb eutectic microstructure were investigated using transmission electron microscopy (TEM) and cyclic loading-unloading tests. Results show that R phase and B19′ martensite transformation are induced by plastic deformation. R phase transformation, which significantly contributes to superelasticity, preferentially occurs at the interfaces between NiTi and eutectic region. Round-shaped Nb-rich phase with rod-like and lamellar-type eutectics are observed in eutectic regions. These phases appear to affect the deformation behavior of the brazed NiTi-Nb region via five distinct stages in stress-strain curves: (I) R phase reorientation, (II) R phase transformation from parent phase, (III) elastic deformation of reoriented martensite accompanied by the plastic deformation of Nb-rich phase and lamellar NiTi-Nb eutectic, (IV) B19′ martensitic transformation, and (V) plastic deformation of the specimen.

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“…The main idea of this method is to combine the unique behaviour of shape memory alloys (SMAs), i.e., shape memory effect and superelasticity, and the functionality of the graded material structures to achieve desired performance or new properties for various applications. Gradient of functional properties of NiTi can be achieved in three ways: compositional gradient [[4], [5], [6]], microstructural gradient [[7], [8], [9]], and geometrical gradient [[10], [11], [12]]. Geometrically graded NiTi can provide a stress or strain gradient for progressive transformation.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental and numerical data for transformation propagation in NiTi shape memory structures

et al. 2019

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This article provides experimental and numerical data for the propagation of stress-induced martensitic transformation within NiTi structures with uniform and nonuniform geometries. This article is related to the research paper entitled “Computational and experimental analyses of martensitic transformation propagation in shape memory alloys” [1]. The heterogeneous transformation evolutions within geometrically graded NiTi structures are presented by thermal images recorded by a high-resolution infrared camera during tensile loading. The modelling of transformation and deformation behaviours of those structures is presented by finite element computational method.

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Mathematical modelling of pseudoelastic behaviour of tapered NiTi bars

Cited by 28 publications

References 20 publications

Experiments on deformation behaviour of functionally graded NiTi structures

Experiments on deformation behaviour of functionally graded NiTi structures

Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires

Experimental and numerical data for transformation propagation in NiTi shape memory structures

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