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

Published online by Cambridge University Press:  09 August 2012

H. Lei ,
B. Zhou ,
Z. Wang  and
Y. Wang
H. Lei*
Affiliation:
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
B. Zhou
Affiliation:
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
Z. Wang
Affiliation:
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
Y. Wang
Affiliation:
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
*
*Corresponding author ([email protected])
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Abstract

In 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.

Keywords

SuperelasticCyclic loadingResidual strain
Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 3 , September 2012 , pp. 469 - 477
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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References

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