This work describes the large  plastic deformation and shear localization in channel die  compression  of a single copper crystal. The  rate independent deformations in single crystals with the concept of “extremal surface”  is used. The  numerical implementation involved the use of a user material subroutine UMAT in FE program ABAQUS to evaluate large deformations. Numerical simulations are presented that illustrate the excellent performance of the algorithm. Good  agreement was found with rate dependent computations.

Keywords: Single crystals, Constitutive behavior, Finite elements.