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- W2026588701 abstract "A stochastic dislocation dynamics (SDD) model is developed to investigate dislocation glide through dispersed obstacles. The model accounts for: 1) the dynamics of the flight process between successive meta-stable dislocations under various drag mechanism using discrete dislocation dynamics, and 2) thermal activation processes for meta-stable pinned dislocations using a stochastic force. The integration of the two processes allows one to examine the transient regime of dislocation motion between obstacle-controlled motion and drag-controlled motion. Result pertaining to the stress-strain rate behavior in copper are obtained. The stress and temperature dependence of the average dislocation velocity show obstacle-controlled region below the critical resolved shear stress (CRSS) and drag controlled region above the CRSS, which is in good qualitative agreement with experimental data. In the transient region right below the CRSS, negative temperature sensitivity is observed due to the competition between the drag effects in dislocation flight process and thermal activation process." @default.
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- W2026588701 date "2002-06-10" @default.
- W2026588701 modified "2023-10-14" @default.
- W2026588701 title "Stochastic Dislocation Dynamics for Dislocation-Defects Interaction: A Multiscale Modeling Approach" @default.
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- W2026588701 doi "https://doi.org/10.1115/1.1479693" @default.
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