Abstract
Incubation time for the emission of a dislocation loop from a Frank-Read type dislocation source in crystal grains of various sizes are studied by three dimensional dislocation dynamics simulations. Results show that there are two regimes where stress exponent is as large as 500 in one regime and quite small in the other. Comparison of results with various values for mobility of dislocations shows that the mobility does not contribute to the critical resolved shear stress (CRSS) for emission of dislocatin loops but it contributes to the time needed to emit dislocation loops when the applied shear stress is sufficiently larger than the CRSS.
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