METHOD OF EVALUATING FORMABILITY OF BULK METALLIC MATETERIAL

摘要

A method for evaluating formability of bulk metal materials is disclosed. Bulk metal material formability evaluation method according to an embodiment of the present invention is to provide a plurality of test pieces of a bulk metal material having a notch formed in the height direction and the same height and inner diameter and different outer diameter, the plurality of test pieces upper mold By performing a volume forming process using the lower and lower molds, the fracture occurs at the notch of each specimen at the forming limit, and the triaxial stress and the fracture strain at the point where the notch of each specimen is broken are derived, respectively. The triaxial stress and fracture strain of each star are shown as one point on the same plane, the curve connecting the points shown is predicted as the forming limit line of the bulk metal material, and the forming of the bulk metal material is based on the predicted forming limit line. Evaluate the sex.