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Materials 2017, 10(10), 1172; doi:10.3390/ma10101172

Multiscale Modeling of Polycrystalline NiTi Shape Memory Alloy under Various Plastic Deformation Conditions by Coupling Microstructure Evolution and Macroscopic Mechanical Response

1
College of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
3
Southwest Technology and Engineering Research Institute, Chongqing 400039, China
4
Precision Forming Integrated Manufacturing Technology of Collaborative Innovation Center, Chongqing 400039, China
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 29 September 2017 / Accepted: 11 October 2017 / Published: 13 October 2017
(This article belongs to the Collection Textures and Anisotropy in Advanced Materials)
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Abstract

Numerical modeling of microstructure evolution in various regions during uniaxial compression and canning compression of NiTi shape memory alloy (SMA) are studied through combined macroscopic and microscopic finite element simulation in order to investigate plastic deformation of NiTi SMA at 400 °C. In this approach, the macroscale material behavior is modeled with a relatively coarse finite element mesh, and then the corresponding deformation history in some selected regions in this mesh is extracted by the sub-model technique of finite element code ABAQUS and subsequently used as boundary conditions for the microscale simulation by means of crystal plasticity finite element method (CPFEM). Simulation results show that NiTi SMA exhibits an inhomogeneous plastic deformation at the microscale. Moreover, regions that suffered canning compression sustain more homogeneous plastic deformation by comparison with the corresponding regions subjected to uniaxial compression. The mitigation of inhomogeneous plastic deformation contributes to reducing the statistically stored dislocation (SSD) density in polycrystalline aggregation and also to reducing the difference of stress level in various regions of deformed NiTi SMA sample, and therefore sustaining large plastic deformation in the canning compression process. View Full-Text
Keywords: shape memory alloy; plastic deformation; crystal plasticity; finite element method; multiscale modeling shape memory alloy; plastic deformation; crystal plasticity; finite element method; multiscale modeling
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Hu, L.; Jiang, S.; Zhou, T.; Tu, J.; Shi, L.; Chen, Q.; Yang, M. Multiscale Modeling of Polycrystalline NiTi Shape Memory Alloy under Various Plastic Deformation Conditions by Coupling Microstructure Evolution and Macroscopic Mechanical Response. Materials 2017, 10, 1172.

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