This work presents a micromechanical model to investigate mechanical properties of nanotwinned dual-phase copper, consisting of the coarse grained phase and the nanotwinned phase. Both strengthening mechanisms of nanotwinning and the contributions of nanovoids/microcracks have been taken into account in simulations. With the aid of modified mean-field approach, the stress–strain relationship is derived by combining the constitutive relations of the coarse grained phase and the nanotwinned phase. Numerical results show that the proposed model enables us to describe the mechanical properties of the nanotwinned composite copper, including both yield strength and ductility. The calculations based on the proposed model agree well with the results from finite element method (FEM). The predicted yield strength and ductility are sensitive to the twin spacing, grain size, as well as the volume fractions of phases in this composite copper. These results will benefit the optimization of both strength and ductility by controlling constituent fractions and the size of the microstructures in metallic materials.
Simulating Size and Volume Fraction-Dependent Strength and Ductility of Nanotwinned Composite Copper
Tianjin University, and Tianjin Key Laboratory
of Nonlinear Dynamics and Control,
Tianjin 300072, China
The Hong Kong Polytechnic University,
Kowloon, Hong Kong, China
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received December 22, 2015; final manuscript received April 28, 2016; published online May 11, 2016. Assoc. Editor: A. Amine Benzerga.
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Zhu, L., Guo, X., and Ruan, H. (May 11, 2016). "Simulating Size and Volume Fraction-Dependent Strength and Ductility of Nanotwinned Composite Copper." ASME. J. Appl. Mech. July 2016; 83(7): 071009. https://doi.org/10.1115/1.4033519
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