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The Mechanical Behavior and Martensitic Transformation of Porous NiTi Alloys Based on Geometrical Reconstruction

Xiaofeng Lu

College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

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Chaojie Wang

College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

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Gang Li

College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

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Yang Liu

College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

E-mail Address: liuyang@njtech.edu.cn

Corresponding authors.

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Xiaolei Zhu

College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

E-mail Address: zhuxiaolei@njtech.edu.cn

Corresponding authors.

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, and

Shantung Tu

College of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

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https://doi.org/10.1142/S1758825117500387Cited by:8 (Source: Crossref)

Abstract

The finite element analysis (FEA) of porous NiTi shape memory alloys (SMAs) remains a challenge due to irregularity and complexity of pore structure. In this paper, the real finite element model (FEM) is established based on the geometrical reconstruction. Through a SMA constitutive model, the mechanical behavior and stress-induced martensitic (SIM) phase transformation are analyzed with the real FEM. The results show that the stress–strain curve of FEA is in good agreement with the experimental curve and the calculation can reflect the mechanical behavior well in the compressive process. With the increase of load, the SIM first appears pore walls or weak parts of struts, then spreads to the center of matrix, and finally happens to most of matrix. When the slope of the stress–strain curve shows obvious changes, the SIM has happened in quite a part of matrix.

Keywords:

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