Spallation analysis with a closed trans-scale formulation of damage evolution |
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Authors: | Wang Haiying Bai Yilong Xia Mengfen Ke Fujiu |
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Institution: | (1) LNM, Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China;(2) Department of Physics, Peking University, 100871 Beijing, China;(3) Department of Applied Physics, Beijing University of Aeronautics and Astronautics, 100083 Beijing, China |
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Abstract: | A closed, trans-scale formulation of damage evolution based on the statistical microdamage mechanics is summarized in this
paper. The dynamic function of damage bridges the mesoscopic and macroscopic evolution of damage. The spallation in an aluminium
plate is studied with this formulation. It is found that the damage evolution is governed by several dimensionless parameters,
i.e., imposed Deborah numbersDe
* andDe, Mach numberM and damage numberS. In particular, the most critical mode of the macroscopic damage evolution, i.e., the damage localization, is determined
by Deborah numberDe
*. Deborah numberDe
* reflects the coupling and competition between the macroscopic loading and the microdamage growth. Therefore, our results
reveal the multi-scale nature of spallation. In fact, the damage localization results from the nonlinearity of the microdamage
growth. In addition, the dependence of the damage rate on imposed Deborah numbersDe
* andDe, Mach numberM and damage numberS is discussed.
The project supported by the National Natural Science Foundation of China (10172084, 10232040, 10232050, 10372012, 10302029)
and the Special Funds for Major State Research Project (G200077305) |
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Keywords: | spallation statistical microdamage mechanics damage evolution damage localization closed trans-scale formulation |
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