THEORETICAL AND EXPERIMENTAL EVALUATION OF DISLOCATION DENSITY IN A WORKPIECE AFTER FORMING

Abstract: The theoretical calculation of dislocation density in different regions of a deformed workpiece of ۹۹.۹۹% pure copper has been carried out using different procedures consisting of Finite Element Method (FEM) and hardness measurement. To assess the validity of the results pertaining to these procedures, the dislocation density is experimentally measured utilizing the Differential Scanning Calorimetry (DSC). Comparing the predicted and experimental results, it was found that the average error in prediction of the dislocation density by the hardness measurement and FEM is ۱۲% and ۲.۵%, respectively. Also, for further confirmation of the evaluated dislocation density of each region of the deformed workpiece, the annealing process was carried out and in the region of higher dislocation density, a finer grain size was observed.

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Keywords: Dislocation density ، FEM ، DSC ، Hardness.