Analytical Study on Training Effect of Pseudoelastic Transformation of Shape Memory Alloys in Cyclic Loading

2001 ◽  
Vol 12 (4) ◽  
pp. 295-300 ◽  
Author(s):  
Hisashi Naito ◽  
Junpei Sato ◽  
Ken Funami ◽  
Yuji Matsuzaki ◽  
Tadashige Ikeda
Keyword(s):  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Analytical Study ◽  
Training Effect

Experimental behavior of iron-based shape memory alloys under cyclic loading histories

2021 ◽  
Vol 272 ◽  
pp. 121712
Author(s):  
Diego Isidoro Heredia Rosa ◽  
Alexander Hartloper ◽  
Albano de Castro e Sousa ◽  
Dimitrios G. Lignos ◽  
Masoud Motavalli ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Experimental Behavior ◽  
Iron Based

A Macromechanical Constitutive Model of Shape Memory Alloys Under Uniaxial Cyclic Loading

2012 ◽  
Vol 28 (3) ◽  
pp. 469-477 ◽  
Author(s):  
H. Lei ◽  
B. Zhou ◽  
Z. Wang ◽  
Y. Wang
Keyword(s):  
Cyclic Loading ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Hysteretic Behavior ◽  
Test Results ◽  
Model Match ◽  
Number Of Cycles ◽  
The Relationship

AbstractIn this paper, the thermomechanical behavior of shape memory alloys (SMAs) subjected to uniaxial cyclic loading is investigated. To obtain experimental data, the strain-controlled cyclic loading-unloading tests are conducted at various strain-rates and temperatures. Dislocations slip and deformation twins are considered to be the main reason that causes the unique cyclic mechanical behavior of SMAs. A new variable of shape memory residual factor was introduced, which will tend to zero with the increasing of the number of cycles. Exponential form equations are established to describe the evolution of shape memory residual factor, elastic modulus and critical stress, in which the influence of strain-rate, number of cycles and temperature are taken into account. The relationship between critical stresses and temperature is modified by considering the cycling effect. A macromechanical constitutive model was constructed to predict the cyclic mechanical behavior at constant temperature. Based on the material parameters obtained from test results, the hysteretic behavior of SMAs subjected to isothermal uniaxial cyclic loading is simulated. It is shown that the numerical results of the modified model match well with the test results.

scholarly journals Effect of Cyclic Loading on Apparent Young’s Modulus and Critical Stress in Nano-Subgrained Superelastic NiTi Shape Memory Alloys

2006 ◽  
Vol 47 (3) ◽  
pp. 735-741 ◽  
Author(s):  
Shengcheng Mao ◽  
Xiaodong Han ◽  
Ming. H. Wu ◽  
Ze Zhang ◽  
Fei Hao ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Critical Stress ◽  
Niti Shape Memory Alloys

Analytical Study of Prestrain Effects on Elastic Properties in Shape Memory Alloys

2000 ◽  
Vol 183-187 ◽  
pp. 1219-1224 ◽  
Author(s):  
Hong Gun Kim ◽  
H.K. Noh ◽  
Young Tae Cho ◽  
J.Y. Kim ◽  
S.K. Park ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Elastic Properties ◽  
Analytical Study

scholarly journals On the effect of detwinning-induced plasticity in compressive cyclic loading of NiTi shape memory alloys

2020 ◽  
Vol 148 ◽  
pp. 103451 ◽  
Author(s):  
Parvin Ebrahimi ◽  
Jamal Arghavani ◽  
Reza Naghdabadi ◽  
J. Patrick McGarry
Keyword(s):  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Niti Shape Memory Alloys

Evolution of hysteresis characteristic of shape memory alloys at incomplete phase transformation cyclic loading

2021 ◽  
Author(s):  
Yajun You ◽  
Xin Guo
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Cyclic Load ◽  
Hysteretic Behavior ◽  
Transformation Stage ◽  
Cyclic Loading Tests

Abstract The phase transformation ratchetting of Shape Memory Alloys (SMAs) at incomplete phase transformation cyclic loading is experimentally and theoretically investigated. To this end, two different kinds of incomplete phase transformation cyclic loading tests on NiTi wires are performed, i.e. incomplete transformation cyclic loads are respectively applied at the stages of forward martensite transformation and reverse martensite transformation. When the cyclic load of incomplete transformation is applied in the positive martensitic transformation stage, a novel phenomenon is discovered: although there is no greater stress to drive the anstenite turn to martensite, the SMAs can still gradually undergo martensite transformation and accumulation until martensite reaches saturation. The hysteretic behavior finally reaches a shakedown state where the strain-stress curve no longer changes with the number of cycles. When the cyclic load of incomplete transformation is applied in the reverse martensitic transformation stage, a similar phenomenon is obtatined. According to the analysis of the temperature evolution during the deformation process of the SMAs, combined with the relationship between the phase transformation yield stress and the temperature of SMAs, the experimental results are reasonably explained. This research is of great significance for a more comprehensive grasp of the mechanical behavior of SMAs.

Study of microstructural growth under cyclic martensite phase transition in shape memory alloys; A molecular dynamics approach

2021 ◽  
pp. 1045389X2110239
Author(s):  
Seyed Amin Moravej ◽  
Ali Taghibakhshi ◽  
Hossein Nejat Pishkenari ◽  
Jamal Arghavani
Keyword(s):  
Molecular Dynamics ◽  
Cyclic Loading ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Continuum Mechanics ◽  
Dynamics Simulation ◽  
Original Form ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Lennard Jones

Shape memory alloys are referred to as a group of alloys that can retrieve the permanent deformation and strain applied to them and eventually return to their original form. So far, various studies have been done to determine the behavior of these alloys under cyclic loading. Most of the studies have mainly been conducted by using the foundations of Continuum Mechanics in order to examine the properties of memory alloys. In this study, instead of using the Continuum Mechanics, a Molecular Dynamics simulation method using Lennard-Jones potential is utilized. The changes in the behavior and properties of memory alloy under cyclic loading are being examined. First, the functional form parameters for the Lennard-Jones potential are solved. Subsequently, these parameters are implemented to evaluate the response to thermal cyclic loading. The results of this study provide a better understanding of the behavior of memory alloys under cyclic loading.

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