The Non-Linear Behaviour of Shape Memory Alloys

1990 ◽  
pp. 1-12
Author(s):  
Ingo Müller
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Non Linear ◽  
Linear Behaviour

Modeling of Internal Damage Evolution During Actuation Fatigue in Shape Memory Alloys

2018 ◽  
Author(s):  
Francis R. Phillips ◽  
Daniel Martin ◽  
Dimitris C. Lagoudas ◽  
Robert W. Wheeler
Keyword(s):  
Phase Transformation ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Damage Evolution ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Internal Damage ◽  
Functional Fatigue ◽  
Non Linear

Shape memory alloys (SMAs) are unique materials capable of undergoing a thermo-mechanically induced, reversible, crystallographic phase transformation. As SMAs are utilized across a variety of applications, it is necessary to understand the internal changes that occur throughout the lifetime of SMA components. One of the key limitations to the lifetime of a SMA component is the response of SMAs to fatigue. SMAs are subject to two kinds of fatigue, namely structural fatigue due to cyclic mechanical loading which is similar to high cycle fatigue, and functional fatigue due to cyclic phase transformation which typical is limited to the low cycle fatigue regime. In cases where functional fatigue is due to thermally induced phase transformation in contrast to being mechanically induced, this form of fatigue can be further defined as actuation fatigue. Utilizing X-ray computed microtomography, it is shown that during actuation fatigue, internal damage such as cracks or voids, evolves in a non-linear manner. A function is generated to capture this non-linear internal damage evolution and introduced into a SMA constitutive model. Finally, it is shown how the modified SMA constitutive model responds and the ability of the model to predict actuation fatigue lifetime is demonstrated.

On a non-linear system for shape memory alloys

1990 ◽  
Vol 2 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Ph. B�nilan ◽  
D. Blanchard ◽  
H. Ghidouche
Keyword(s):  
Linear System ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Non Linear ◽  
Non Linear System

scholarly journals A Numerical Method to Model Non-linear Damping Behaviour of Martensitic Shape Memory Alloys

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2178 ◽  
Author(s):  
Pouya Haghdoust ◽  
Antonietta Lo Conte ◽  
Simone Cinquemani ◽  
Nora Lecis
Keyword(s):  
Finite Element ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Hysteresis Loops ◽  
Element Model ◽  
Thin Layers ◽  
Hybridization Technique ◽  
Free Decay ◽  
Non Linear ◽  
Linear Damping

This article investigates the efficiency of hybridizing composites with thin layers of martensitic shape memory alloys for improvement of damping. The non-linear damping behaviour of martensitic shape memory alloys is simulated using a modified version of Masing’s rules. The model was implemented in a user subroutine of a finite element code, and validated by a numerical simulation of experimental hysteresis loops at different maximum strain amplitudes. The experimental free decay of hybridized glass fiber reinforced polymer beams was simulated using the finite element model, including the validated model of the investigated materials. The amplitude-dependent damping of the hybrid beams in free decay was reproduced successfully in the numerical analysis and it was proven that the hybridization technique is efficient for improvement of damping.

Influence of martensite stabilization on the low-temperature non-linear anelasticity in Cu-Zn-Al shape memory alloys

2002 ◽  
Vol 50 (11) ◽  
pp. 3023-3044 ◽  
Author(s):  
S. Kustov ◽  
S. Golyandin ◽  
K. Sapozhnikov ◽  
E. Cesari ◽  
J. Van Humbeeck ◽  
...  
Keyword(s):  
Low Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Non Linear ◽  
Martensite Stabilization

scholarly journals Extension of a Linear Behaviour Model of Shape Memory Alloys for Finite Strain Studies

1997 ◽  
Vol 07 (C5) ◽  
pp. C5-83-C5-88 ◽  
Author(s):  
S. Moyne ◽  
M. L. Boubakar ◽  
C. Lexcellent
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Finite Strain ◽  
Linear Behaviour

scholarly journals Non-linear dynamic thermomechanical behaviour of shape memory alloys

2012 ◽  
Vol 23 (14) ◽  
pp. 1593-1611 ◽  
Author(s):  
Mohamed O Moussa ◽  
Ziad Moumni ◽  
Olivier Doaré ◽  
Cyril Touzé ◽  
Wael Zaki
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Linear Dynamic ◽  
Thermomechanical Behaviour ◽  
Non Linear
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