Effect of Nanopores on Mechanical Properties of the Shape Memory Alloy

Nanoporous Shape Memory Alloys (SMA) are widely used in aerospace, military industry, medical and health and other fields. More and more attention has been paid to its mechanical properties. In particular, when the size of the pores is reduced to the nanometer level, the effect of the surface effect...

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Bibliographic Details
Published in:Micromachines (Basel) 2021-05, Vol.12 (5), p.529
Main Authors: Du, Chunzhi, Li, Zhifan, Liu, Bingfei
Format: Article
Language:English
Subjects:
Aerospace industry
Alloys
Composite materials
constitutive model
Constitutive models
Mathematical models
Mechanical properties
Modulus of elasticity
nanopores
Numerical methods
Porous materials
Powder metallurgy
shape memory alloy
Shape memory alloys
Stress-strain curves
surface effect
young’s modulus
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Summary:Nanoporous Shape Memory Alloys (SMA) are widely used in aerospace, military industry, medical and health and other fields. More and more attention has been paid to its mechanical properties. In particular, when the size of the pores is reduced to the nanometer level, the effect of the surface effect of the nanoporous material on the mechanical properties of the SMA will increase sharply, and the residual strain of the SMA material will change with the nanoporosity. In this work, the expression of Young’s modulus of nanopore SMA considering surface effects is first derived, which is a function of nanoporosity and nanopore size. Based on the obtained Young’s modulus, a constitutive model of nanoporous SMA considering residual strain is established. Then, the stress–strain curve of dense SMA based on the new constitutive model is drawn by numerical method. The results are in good agreement with the simulation results in the published literature. Finally, the stress-strain curves of SMA with different nanoporosities are drawn, and it is concluded that the Young’s modulus and strength limit decrease with the increase of nanoporosity.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi12050529