NiTi shape memory alloys
Laser welding of Cu-Al-Be shape memory alloys: Microstructure and mechanical properties
... Cu-based shape memory alloys are potential substitutes of NiTi shape memory alloys, owing to their lower pro-duction costs and recent increase in mechanical properties ...
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Phenomenological model for phase transformation characteristics of textured shape memory alloys
... of niti using circular bulge testing of thin plates,” Scripta Materialia, ...anisotropic shape memory alloys,” Mechanics of Materials, ...
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THEORETICAL AND NUMERICAL ANALYSIS OF FRACTURE OF SHAPE MEMORY ALLOYS
... volume fraction can be estimated from the distributions of the equivalent plastic strain. They concluded that the extent of transformation start region decreases rapidly with increasing temperature but the extent of ...
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A comprehensive approach for fatigue analysis of shape memory alloys
... 4.6 conclusion The monocycle ZM model for SMA is extended to account for thermomechanical coupling. It is implemented into the finite element code Cast3m, considering strong coupling between me- chanical and thermal ...
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Multi-scale Analysis of the Fatigue of Shape Memory Alloys
... in NiTi polycrystals is a complicated phenomenon including multi-scale structures as already illustrated in ...a NiTi polycrystalline strip under uniaxial ...various NiTi structures (wire/strip/tube) ...
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A thermomechanical Hencky strain constitutive model for shape memory alloys
... data in Figure 2(b-d). Specifically, Figure 2(b) shows the scaled shear stress √ 3τ versus axial stress σ, Figure 2(c) shows axial stress σ versus axial strain ε and Figure 2(d) shows √ 3τ versus the scaled shear strain ...
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Constitutive Modeling of the Thermomechanical and Cyclic Behavior of Shape Memory Alloys in Finite Deformations
... With the increasing trends towards miniaturization of robotic system, SMAs have been exploited as micro-actuators and artificial muscles in a diverse range of commercial robotic systems. Kheirikhah et al. ( 2011 ) ...
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Multiscales analysis of stress induced martensitic transformation in the shape memory alloys: microstructure-stresses correlation
... Une étude expérimentale a été réalisée par Brinson [22] qui a examiné le comportement microstructural et macroscopique lors de la transformation martensitique des AMF polycristallins de NiTi au cours de chargement ...
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Experimental analysis of the quasi-static and dynamic torsional behaviour of shape memory alloys
... frequencies, and it decreases monotonically at high frequencies. This partic- ular non-monotonic evolution of the loop area as function of the frequency was already observed experimentally in NiTi SMA under ...
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Nitride coating enhances endothelialization on biomedical NiTi shape memory alloy
... of actin cytoskeleton was visualized by incubation with Alexa Fluor 488 Phalloidin (Fig. 5). Obvious focal adhesions marked by dot-like vinculin were detected in the HUVECs cultured on both alloys at 2 h ...
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Investigation and Composition Characterization of a “NiTi-like” Alloy Combining High Temperature Shape Memory and High Entropy
... studied shape memory alloys [ 19 , 26 , 27 ...the memory effect decreases from the fiftieth thermal cycle for this ...the shape memory ...
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2020 — Modeling of bulk and porous shape memory alloys
... model for elastic modulus, while this value is significantly different between austenite and martensite. The literature contains some examples of material modeling for SMAs, taking into account this orientational ...
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Low cycle fatigue of shape memory alloys
... Chapter 2 Experimental investigations This chapter documents a comprehensive experimental investigation of the cyclic behavior and low cycle fatigue of pseudoelastic shape memory alloys (SMAs). To ...
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Study of burr formation and phase transformation during micro-milling of NiTi alloys
... nickel-titanium alloys; design of experiments 1 INTRODUCTION The Nickel-Titanium (NiTi) alloys are shape memory alloys (SMA) which exhibit two properties, pseudoelasticity and ...
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Cyclic multiaxial behavior modeling of Shape Memory Alloys
... 1. SMA MODELING multi-dimensional loading. A simple technique to induce controlled biaxial stress conditions is employing one-dimensional boundary loading on non-conventional geometries, such as the Meuwissen ...
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Computational framework for simulating the deformation and fracture response of oligocrystalline shape memory alloys
... In order to investigate the effects the grain boundary characteristics have on the martensitic phase transformation and transformation-induced fracture, finite element [r] ...
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Micro-end milling of NiTi biomedical alloys, burr formation and phase transformation
... high and as a consequence the tool wear was elevated with a high notch wear. Using emulsion 65 as lubricant reduced cutting forces and tool wear only for the lowest cutting speed value of 20m/min. In the second stage ...
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Numerical Simulation of Pseudoelastic Shape Memory Alloys using the Large Time Increment Method
... [14] Morin, C., Moumni, Z., and Zaki, W., 2011. “Direct Numerical Determination of the Asymptotic Cyclic Behavior of Pseudoelastic Shape Memory Structures”. Journal of Engineering Mechanics, 137(7), pp. ...
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Time Integration and Assessment of a Model for Shape Memory Alloys Considering Multiaxial Nonproportional Loading Cases
... Fig. 5: Hoop stress-strain response for the SMA cylinder. REFERENCES [1] F. Auricchio, E. Bonetti, G. Scalet, and F. Ubertini, 2014. “Theoretical and numerical modeling of shape memory alloys ...
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Optimized design of real-scale A320 morphing high-lift flap with shape memory alloys and innovative skin
... actuators like electromechanical or hydraulic servomotors. Recent advances in the field of smart materials show the potential to overcome difficulties to make a wing both stiff enough to withstand the loads, and ...
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