Abstract
The estimation of strain hardening during uniaxial tensile loading followed by stress relaxation and reloading is required to quantify the strain aging and ductility improvement. The strain hardening, effective stress, and internal stress are associated with the variation of mobile and forest dislocations during uniaxial loading followed by stress relaxation and reloading, and it is shown by analytically coupling them in this work. The strain hardening behavior of the aluminum sample is examined in this procedure. Strain hardening occurs in the sample due to generated mobile and forest dislocations. Exhaustion of mobile dislocation density significantly affects the stress drop and activation volume during stress relaxation, which further causes strain hardening. Apart from this, mobile dislocation density increases in the initial stage of uniaxial loading and reloading after stress relaxation. A new relationship is proposed for the evolution of dislocations causing strain hardening during reloading. It has been validated with the literature data and found to be well fitted.
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Kumar, S. Evaluation of Strain Hardening During Uniaxial Tensile Loading Followed by Stress Relaxation and Reloading. Metall Mater Trans A 53, 1336–1344 (2022). https://doi.org/10.1007/s11661-022-06593-6
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DOI: https://doi.org/10.1007/s11661-022-06593-6