|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fracture Properties and Residual Stresses in Small Dimensions
||Critical Stresses in Intermittent Plasticity
||Peter M Derlet, Robert Maass
|On-Site Speaker (Planned)
The extreme value statistics of the first discrete irreversible plastic event is investigated for experimental nano-indentation and dislocation dynamics simulation data. It is found that the average of the critical stress and the Weibull fluctuations around it, is related to the deforming crystal volume via an exponentially truncated power-law. When the underlying master distribution of critical stresses is assumed to be a power-law, it becomes possible to extract the corresponding exponent, the density of discrete plastic events available to the crystal, and to understand the exponential truncation as a break-down of the asymptotic Weibull limit due to the micron length-scale of the deforming volume.