Investigations on phase transformation and mechanical characteristics of laser additive manufactured TiNiCu shape memory alloy structures

2016 ◽  
Vol 238 ◽  
pp. 142-151 ◽  
Author(s):  
S. Shiva ◽  
I.A. Palani ◽  
C.P. Paul ◽  
S.K. Mishra ◽  
B. Singh
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical Characteristics ◽  
Tinicu Shape Memory Alloy

Investigation of Thermomechanical Properties of Ferromagnetic NiFeGa Shape Memory Alloy Subjected to Pseudoelastic Compression Test

2011 ◽  
Vol 56 (2) ◽  
pp. 401-408 ◽  
Author(s):  
E. Pieczyska ◽  
J. Dutkiewicz ◽  
F. Masdeu ◽  
J. Luckner ◽  
R. Maciak
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Compression Test ◽  
Mechanical Characteristics ◽  
Infrared Camera ◽  
Thermomechanical Properties ◽  
Transformation Process ◽  
Temperature Changes ◽  
Reversible Phase

Investigation of Thermomechanical Properties of Ferromagnetic NiFeGa Shape Memory Alloy Subjected to Pseudoelastic Compression TestIn the study stress-induced reversible phase transformation in NiFeGa magnetically controlled shape memory alloy subjected to pseudoelastic compression test was investigated. The specimen's mechanical characteristics and temperature changes related to the exothermic martensite transformation and endothermic reverse transformation were measured in contact-less way by using a fast and sensitive infrared camera (IR). It was found that the stress-induced phase transformation process occurs in this alloy in heterogeneous way, since the observed specimen's temperature distribution was not uniform. Stress-strain curves obtained for the first, as well as for the subsequent six loading-unloading compression cycles and their related temperature changes, elaborated as average from the specimen's surface, were analyzed. It was concluded that the stress and the temperature changes developing in the subsequent cycles depend on the applied test conditions, however the highest discrepancies were observed between the first and the second cycles of the compression loading.

A Novel Training-Free Processed Fe-Mn-Si-Cr-Ni Shape Memory Alloy Undergoing δ → γ Phase Transformation

2016 ◽  
Vol 47 (7) ◽  
pp. 3277-3283 ◽  
Author(s):  
Huabei Peng ◽  
Gaixia Wang ◽  
Yangyang Du ◽  
Shanling Wang ◽  
Jie Chen ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory

Fabrication of cylindrical micro actuator by etching of TiNiCu shape memory alloy tube

2011 ◽  
Vol 165 (2) ◽  
pp. 392-398 ◽  
Author(s):  
Takashi Mineta ◽  
Tomoe Deguchi ◽  
Eiji Makino ◽  
Takahiro Kawashima ◽  
Takayuki Shibata
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Micro Actuator ◽  
Alloy Tube ◽  
Tinicu Shape Memory Alloy

A constitutive model for Fe-based shape memory alloy considering martensitic transformation and plastic sliding coupling: Application to a finite element structural analysis

2012 ◽  
Vol 23 (10) ◽  
pp. 1143-1160 ◽  
Author(s):  
Walid Khalil ◽  
Alain Mikolajczak ◽  
Céline Bouby ◽  
Tarak Ben Zineb
Keyword(s):  
Finite Element ◽  
Phase Transformation ◽  
Structural Analysis ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Internal Variables ◽  
Thermomechanical Loading ◽  
Proposed Model ◽  
Numerical Tool

In this article, we propose a finite element numerical tool adapted to a Fe-based shape memory alloy structural analysis, based on a developed constitutive model that describes the effect of phase transformation, plastic sliding, and their interactions on the thermomechanical behavior. This model was derived from an assumed expression of the Gibbs free energy taking into account nonlinear interaction quantities related to inter- and intragranular incompatibilities as well as mechanical and chemical quantities. Two scalar internal variables were considered to describe the phase transformation and plastic sliding effects. The hysteretic and specific behavior patterns of Fe-based shape memory alloy during reverse transformation were studied by assuming a dissipation expression. The proposed model effectively describes the complex thermomechanical loading paths. The numerical tool derived from the implicit resolution of the nonlinear partial derivative constitutive equations was implemented into the Abaqus® finite element code via the User MATerial (UMAT) subroutine. After tests to verify the model for homogeneous and heterogeneous thermomechanical loadings, an example of Fe-based shape memory alloy application was studied, which corresponds to a tightening system made up of fishplates for crane rails. The results we obtained were compared to experimental ones.

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