Computer Simulation of Dislocation Groups Dynamics Under Applied Constant Stress and Its Application to Yield Problems of Mild Steel

Summary

The number of dislocations emitted from the source under constant applied stress has been obtained in terms of simple and analytical formula by computer simulation on dislocation groups dynamics.

Based on this simulation and the previous one, yield model in bcc metals is proposed and the results are applied to the problem of the delay to the yield initiation under rapidly applied constant stress and of initial yield under constant rate of stress application in mild steel. The theoretical results are in good agreement with the experimental data on the temperature and the applied stress dependences of yield delay time and on the temperature and the stress rate dependences of upper yield stress in the mild steel using the same parameters, respectively.