Assessment of tension–compression asymmetry of NiTi using circular bulge testing of thin plates

Grolleau, Vincent; Louche, Hervé; Delobelle, Vincent; Penin, Arnaud; Rio, Gérard; Liu, Yinong; Favier, Denis

doi:10.1016/j.scriptamat.2011.05.003

Cited by 30 publications

(13 citation statements)

References 24 publications

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“…The tension-compression asymmetry is observable not only on the critical stress to trigger the martensitic transformation, but also on the stress-temperature slopes of the phase diagram and on the magnitude of transformation strains [4]. The behavior of processed SMAs also shows a strong anisotropic behavior [5,6]. Like other metals, the texture of the material and the presence of internal stresses are found to be responsible for such anisotropy.…”

Section: Phase Transformation Of Anisotropic Shape Memory Alloys: Thementioning

confidence: 94%

Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity

Chatziathanasiou

Chemisky

Meraghni

et al. 2015

Shap. Mem. Superelasticity

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract In the present study, a new transformation criterion that includes the effect of tension-compression asymmetry and texture-induced anisotropy is proposed and combined with a thermodynamical model to describe the thermomechanical behavior of polycrystalline shape memory alloys. An altered Prager criterion has been developed, introducing a general transformation of the axes in the stress space. A convexity analysis of such criterion is included along with an identification strategy aimed at extracting the model parameters related to tension-compression asymmetry and anisotropy. These are identified from a numerical simulation of an SMA polycrystal, using a self-consistent micromechanical model previously developed by Patoor et al. (J Phys IV 6(C1):277-292, 1996) for several loading cases on isotropic, rolled, and drawn textures. Transformation surfaces in the stress and transformation strain spaces are obtained and compared with those predicted by the micromechanical model. The good agreement obtained between the macroscopic and the microscopic polycrystalline simulations states that the proposed criterion and transformation strain evolution equation can capture phenomenologically the effects of texture on anisotropy and asymmetry in SMAs.

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Section: Phase Transformation Of Anisotropic Shape Memory Alloys: Thementioning

confidence: 94%

Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity

Chatziathanasiou

Chemisky

Meraghni

et al. 2015

Shap. Mem. Superelasticity

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“…In order to design a stent that will interact with the prostate tissues with proper extended and contracted diameters, the behaviour of NiTi wire and tube was investigating under pure bending. NiTi materials present tensioncompression asymmetry [5,6], which makes bending behaviour difficult to predict. A specific *Corresponding author: gabriel.antherieu@imag.fr apparatus has been designed.…”

Section: Methodsmentioning

confidence: 99%

NiTi based stent for the treatment of acute urinary retention due to benign prostatic hyperplasia: a preliminary study on NiTi wires and tubes under pure bending

Antherieu

Connesson

Favier

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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International audienceBenign prostatic hyperplasia (BPH) remains an incompletely understood disease, mostly striking old men. As an alternative to catheterization, an innovative NiTi shape memory alloy (SMA) based stent, made of a helical wire inserted into a helical tube was developed. In particular, this stent presents at least two distinct successive shape memories during heating, allowing an extension phase to release the urethra, and a contraction phase for an easy removal. This paper presents the stent mechanism, and the first mechanical characterization of the NiTi wires and tubes, under pure bending

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“…The transformation functionsΦ F andΦ R are the particular terms in the transformation criteria that consider the shape of the bounding surfaces in the six-dimensional stress hyperspace; here a modified Prager function is chosen that accounts for tension-compression asymmetry but not anisotropy (Bouvet et al, 2004;Grolleau et al, 2011). The following formulation closely follows Patoor et al (1996), Peultier et al (2008), and Chemisky et al (2011).…”

Section: Fully Recoverable Martensitic Transformationmentioning

confidence: 99%

Three-dimensional constitutive model for structural and functional fatigue of shape memory alloy actuators

Chemisky

Hartl

Meraghni

2018

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractA three-dimensional constitutive model is developed that describes the behavior of shape memory alloy actuators undergoing a large number of cycles leading to the development of internal damage and eventual catastrophic failure. Physical mechanisms such as transformation strain generation and recovery, transformation-induced plasticity, and fatigue damage associated with martensitic phase transformation occurring during cyclic loading are all considered within a thermodynamically consistent framework. Fatigue damage in particular is described utilizing a continuum theory of damage. The total damage growth rate has been formulated as a function of the current stress state and the rate of martensitic transformation such that the magnitude of recoverable transformation strain and the complete or partial nature of the transformation cycles impact the total cyclic life as per experimental observations. Simulation results from the model developed are compared to uniaxial actuation fatigue tests at different applied stress levels. It is shown that both lifetime and the evolution of irrecoverable strain are accurately predicted by the developed model.

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Assessment of tension–compression asymmetry of NiTi using circular bulge testing of thin plates

Cited by 30 publications

References 24 publications

Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity

Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity

NiTi based stent for the treatment of acute urinary retention due to benign prostatic hyperplasia: a preliminary study on NiTi wires and tubes under pure bending

Three-dimensional constitutive model for structural and functional fatigue of shape memory alloy actuators

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