Work-hardening behavior of mild steel under stress reversal at large strains

Abstract A physically based modeling and experimental investigation of the work-hardening behavior of AK-mild steel under stress reversal at large strains is presented. Internal variables describing the polarity of persistent dislocation structures, a “capacitor-like” behavior, and long-range internal stresses were introduced. By considering the evolution of dislocation substructures during reversed deformation, the model explains the strain-hardening stagnation, the type II recovery and the influence of the amount of prestress. The strain-hardening behavior at large strains (up to an amount of shear of 90%) has been investigated. A satisfactory quantitative agreement has been achieved between model predictions and experimental results.

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