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Estimate of Stress in the Channel of Persistent Slip Bands Based on Dislocation Dynamics

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Abstract:

To estimate the fatigue endurance limit at the micro-scale two unlike dislocations gliding in a channel of a persistent slip bands are considered. The dislocations are modeled as moving planar flexible curves. The objective of the simulations is to determine the averaged stress in the channel needed for the dislocations to escape one another using statistics of encounters of such dislocation pairs. We employed an iso-strain approach, i.e. the assumption that the total strain everywhere in the channel is the same.

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Periodical:

Materials Science Forum (Volumes 567-568)

Pages:

405-408

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.567-568.405

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Cite this paper

Online since:

December 2007

Authors:

Josef Křišt'an, Jan Kratochvíl

Keywords:

Dislocation Dynamics, Escape Stress, Fatigue of Materials

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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