Mechanism-Based Phenomenological Models for the Pseudoelastic Hysteresis Behavior of Shape Memory Alloys

2001 ◽  
Vol 12 (1) ◽  
pp. 21-30
Author(s):  
Brendon Malovrh ◽  
Farhan Gandhi
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phenomenological Models ◽  
Hysteresis Behavior

Analysis of a NiTi Shape Memory Alloy

2015 ◽  
Vol 812 ◽  
pp. 89-93 ◽  
Author(s):  
László Kálmán ◽  
István Mészáros
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
Hysteresis Behavior ◽  
Niti Alloys ◽  
Basic Properties ◽  
Functional Mechanism ◽  
The One

This work demonstrates particularly the basic properties of shape memory alloys and gives a brief review about their basic crystallographic processes. The attributes of shape memory alloys will be presented through the NiTi alloys. The crystallographic principles of three unique properties were investigated and the functional mechanism described. One of the three essential mechanisms, the one-way effect was demonstrated through an experiment. The change of length depending temperature was tested and documented. The hysteresis behavior of shape memory alloys was recorded.

The Thermomechanical Modeling for Shape Memory Alloys

2011 ◽  
Vol 672 ◽  
pp. 195-199
Author(s):  
Diana C. Cirstea ◽  
Mariana Lucaci ◽  
Doina Raducanu ◽  
Violeta Tsakiris
Keyword(s):  
Constitutive Equation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Phenomenological Models ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Recovery Stress ◽  
Stress Strain ◽  
Reasonable Approach ◽  
Thermomechanical Modeling

The shape memory alloys are materials that can change their shape by applying thermomechanical treatments. In order to design SMA materials, the stress-strain-temperature relationship is necessary. Modeling the constitute behavior of these materials supposes a few phenomenological models that can provide a quick and reasonable approach to assess the behavior of SMA. The proposed constitutive equation expresses well the properties of the shape memory effect, pseudoelasticity and recovery stress.

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