Journal
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
Volume 9, Issue 3, Pages -Publisher
IMPERIAL COLLEGE PRESS
DOI: 10.1142/S1758825117500387
Keywords
NiTi; porous material; geometrical reconstruction; finite element analysis; mechanical behavior; martensitic transformation
Categories
Funding
- National Natural Science Foundations of China [11402132, 11401272]
- Natural Science Funds of Jiangsu Province [BK20131411, BK20140105]
- Natural Science Fund of colleges in Jiangsu [16KJB130003]
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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.
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