Atomistic mechanisms of fatigue in nanocrystalline metals
We investigate the mechanisms of fatigue behavior in nanocrystalline metals at the atomic scale using empirical force laws and molecular level simulations. A combination of molecular statics and molecular dynamics was used to deal with the time scale limitations of molecular dynamics. We show that t...
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| Published in | Physical review letters Vol. 94; no. 16; p. 165502 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
29.04.2005
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| Online Access | Get more information |
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| Summary: | We investigate the mechanisms of fatigue behavior in nanocrystalline metals at the atomic scale using empirical force laws and molecular level simulations. A combination of molecular statics and molecular dynamics was used to deal with the time scale limitations of molecular dynamics. We show that the main atomistic mechanism of fatigue crack propagation in these materials is the formation of nanovoids ahead of the main crack. The results obtained for crack advance as a function of stress intensity amplitude are consistent with experimental studies and a Paris law exponent of about 2. |
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| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.94.165502 |