Extrusion analysis and workability prediction using finite element method

Abstract

This study predicts the workability (center bursting) in the conical die extrusion. The finite element method based on the rigid-plastic model is used to simulate the axisymmetric extrusion within the steady state stage. Coulomb's friction law is utilized to calculate friction stresses on the die-workpiece interface. The results are compared with frictionless interfaces. A modified fracture criterion according to the maximum tensile stress-strain energy is adopted. The center bursting defect in extrusion is predicted and compared with experimental results.