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

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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)

Edited by:

Pavel Šandera

Pages:

405-408

Citation:

J. Křišt'an and J. Kratochvíl, "Estimate of Stress in the Channel of Persistent Slip Bands Based on Dislocation Dynamics", Materials Science Forum, Vols. 567-568, pp. 405-408, 2008

Online since:

December 2007

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[1] C. de Sansal and B. Devincre: (private communication, 2006).

[2] K.W. Schwarz and H. Mughrabi: Phil. Mag. Vol. 86 (2006), p.773.

[3] J.A. El-Awady, N.M. Ghoniem and H. Mughrabi, in: Dislocation Modelling of Localized Plasticity in Persistent Slip Bands, edited by A. Garmestani, TMS, (2007, in press).

[4] J. Křišťan and J. Kratochvíl: Phil. Mag. (2007, in press).

[5] H. Mughrabi and F. Pschenitzka: Phil. Mag. Vol 85 (2005), p.3029.

[6] L. Devroy: Non-uniform random variate generation, Springer-Verlag (1986).

[7] H. Mughrabi, in Continuum Models of Discrete Systems 4, edited by O. Brulin and R.K.T. Hsieh (North Holland, The Hague, 1981), p.241.

[8] U. Essmann and K. Differt: Scripta Metall. Vol 22 (1988), p.1337.