Description

A criterion to set workability limits for internal ductile fracture (voids and cracks) in the cold heading of dual phase steel is presented. The proposed criterion is based on the damage estimated by the history of the equivalent plastic strain and stress triaxiality as a weighting function. The methodology to determine the parameters in the workability criterion is also explained. This methodology employs the drop weight compression test to simulate the cold heading process in conjunction with finite element analysis (implemented within ABAQUS/Explicit).