| Citation: | JI Yu, XING Yufeng, SHAO Lihuaet al. Stochastic unit cell model for predicting elastic modulus of nanoporous copper[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(10): 1923-1928. doi: 10.13700/j.bh.1001-5965.2019.0538(in Chinese)
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The elastic moduli of nanoporous copper measured through experiment are much lower than the simulated results from molecular dynamics. And the size of actual ligaments is larger than that used in simulation. In this paper, a stochastic unit cell model of nanoporous material is established in software ABAQUS through Python platform. Homogenized elastic parameter was calculated by multiscale homogenization method based on thermal-stress analogy method. First, the elastic modulus of nanoporous gold was predicted by the present unit cell model and compared with the experimental results. The high agreement indicates the effectiveness of the present model. Second, the model was applied to predicting the homogenization elastic modulus of the nanoporous copper under different volume fractions. The threshold phenomenon of the change of the homogenization elastic modulus of the nanoporous copper with volume fractions was revealed and the mechanism of this phenomenon was interpreted physically. Finally, the influencing factors resulting in the difference between the predicted results and the experimental data were analyzed.
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