Brinckmann, Steffen and Van der Giessen, Erik (2007) A fatigue crack initiation model incorporating discrete dislocation plasticity and surface roughness. International Journal of Fracture, 148 (2). pp. 155-167. ISSN 0376-9429 http://resolver.caltech.edu/CaltechAUTHORS:BRIijf07
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Although a thorough understanding of fatigue crack initiation is lacking, experiments have shown that the evolution of distinct dislocation distributions and surface roughness are key ingredients. In the present study we introduce a computational framework that ties together dislocation dynamics, the fields due to crystallographic surface steps and cohesive surfaces to model near-atomic separation leading to fracture. Cyclic tension–compression simulations are carried out where a single plastically deforming grain at a free surface is surrounded by elastic material. While initially, the cycle-by-cycle maximum cohesive opening increases slowly, the growth rate at some instant increases rapidly, leading to fatigue crack initiation at the free surface and subsequent growth into the crystal. This study also sheds light on random local microstructural events which lead to premature fatigue crack initiation.
|Additional Information:||© The Author(s) 2008. Springer OpenAccess. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. Received: 15 April 2007 / Accepted: 23 February 2008 / Published online: 26 March 2008. We gratefully acknowledge the computational resources for the present work, which were provided by the Materials Science Center, University of Groningen, The Netherlands.|
|Subject Keywords:||Dislocation, Cohesive surface, Surface roughness, Fatigue initiation|
|Usage Policy:||This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.|
|Deposited By:||Archive Administrator|
|Deposited On:||19 May 2008|
|Last Modified:||26 Dec 2012 10:02|
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