METHOD OF EVALUATING FORMABILITY OF BULK METALLIC MATETERIAL

摘要

Disclosed is a method for evaluating the formability of bulk metallic materials. The method for evaluating the formability of a bulk metal material according to an embodiment of the present invention includes a bulk metal material having a center model in which the upper and lower V-shaped notches are symmetric and the offset model in which the upper and lower V-shaped notches are asymmetric. When a test piece is prepared and a shear test is performed using a jig to apply a vertical load to each model test piece, fracture is induced in the upper and lower V-shaped notches of each model test piece at the molding limit, and when each model test piece is broken by induction of fracture To measure the displacement according to the vertical load of each model test piece, perform finite element analysis based on the measured displacement according to the vertical load of each model test piece to derive and derive the strain and triaxial stress of each model test piece at the point of failure. Based on the strain and triaxial stress of each model specimen, the forming limit diagram of the bulk metal material is predicted.