TiNi合金の応力-ひずみ-温度関係について
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In this article, a set of constitutive equations consisting of the mechanical constitutive equation and of the transformation kinetics were presented to describe the transformation pseudoelasticity, the partial pseudoelsasticity and the shape memory effect.Abstract:
The stress-strain-temperature relation in TiNi alloys was investigated from the phenomenological point of view. A set of constitutive equations consisting of the mechanical constitutive equation and of the transformation kinetics were presented to describe the transformation pseudoelasticity, the partial pseudoelasticity and the shape memory effect. The material constants in the theory were determined from the tension tests on TiNi wire specimens at various temperatures. The theory was successfully applied to the calculation of the recovery force induced in the heating process under the condition of constraint strain.read more
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Journal ArticleDOI
Effect of notches on the behavior of superelastic round-bar NiTi-specimens
TL;DR: In this paper, notched round-bar NiTi-specimens have been subjected to a simple set of experimental tests and an extensive numerical investigation Both the cases of tensile loading and one-cycle loading have been studied, and the main results show that notches can have a negative effect on the superelastic behavior in NiTi, and that this is related to the development of plastic strains in the material.
Journal ArticleDOI
Modeling and Numerical Simulation on Thermomechanical Behavior of SMA Plates with Two-Way Shape Memory Effect
TL;DR: In this article, the transformation-induced deformation of SMA plates is described by newly defined transformation expansion coefficients, based on the physical understanding of the mechanism of TWSME.
Book ChapterDOI
DEFORMATION BEHAVIOR OF TiNi SHAPE MEMORY ALLOY UNDER THERMOMECHANICAL CYCLING
TL;DR: In this article, the authors show that during the thermomechanical cycling, the transformation stresses of the martensitic transformation and the reverse transformation decrease, but the transformation temperatures increase.
Book ChapterDOI
A Thermo-Electromechanical Model for an Actuator using Shape Memory Alloy driven by Pulse Width Electric Heating
Abstract: Dynamic behavior of an actuator using Shape Memory Alloy is analyzed, based on a thermoplastic model. One half of a SMA wire is electrically heated alternatively and the other half plays the roll of a bias spring. The temperature is governed by the heat equation containing the Joule heat, the latent heat and the heat transfer to the air. The response of the actuator to a cyclic change of the electric power is obtained.