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Fracture toughness of Cu and Ni single crystals with a nanocrack

Published online by Cambridge University Press:  21 May 2015

Cheng Bin Cui ,
Seon Do Kim  and
Hyeon Gyu Beom
Cheng Bin Cui
Affiliation:
Department of Mechanical Engineering, Inha University, Incheon 402-751, Republic of Korea
Seon Do Kim
Affiliation:
Department of Mechanical Engineering, Inha University, Incheon 402-751, Republic of Korea
Hyeon Gyu Beom*
Affiliation:
Department of Mechanical Engineering, Inha University, Incheon 402-751, Republic of Korea
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The fracture toughness values of nanosized Cu and Ni single crystals with an edge nanocrack were determined under quasi-static loading conditions. Molecular statics (MS) simulations that can essentially capture the discreteness and the nonlinearity of materials were used in the present study. Different crack lengths were used to evaluate the effects of crack size on the fracture toughness. Based on MS simulations, the energy release rate was calculated using the energies obtained from two models with neighboring crack lengths under the same loading conditions. Furthermore, continuum counterparts of the atomistic models were used to calculate the toughness by the finite element method for linear elastic fracture mechanics (LEFM). The reasons behind the discrepancies between the toughness values obtained using different methods were discussed, and the applicable ranges of the toughness and the LEFM were indicated in terms of the lattice constants.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1957 - 1964
Copyright
Copyright © Materials Research Society 2015 

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References

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