期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 33, 期 12, 页码 1564-1573出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.06.015
关键词
Fatigue; Mode III; bcc iron; Molecular dynamics simulations
资金
- Institute Research Plan [AV0Z20760514]
- GA CR [P108/10/0698]
We present new results of 3D molecular dynamic (MD) simulations of a mechanical behaviour of an edge crack ((1) over bar 1 0) [1 1 0] (crack plane/crack front) in a single crystal of bcc iron cyclically loaded in mode III at room temperature. Our previous 3D molecular dynamic simulations showed that this crack under monotonic uniaxial tension loading in mode I emitted blunting dislocations in the inclined < 1 (1) over bar 1 > {(1) over bar 1 2} slip systems and it was stable up to very high loads, in qualitative agreement with experiments and continuum predictions. Our question is how the cyclic loading in mode III changes the crack behaviour and its stability. The paper also brings information on how the distribution of external forces in mode III influences the fatigue crack behaviour and how the defects generated by the crack can produce experimentally observed advances of the crack front in local modes I, II, I + II and II + III. (C) 2011 Elsevier Ltd. All rights reserved.
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