WRINKLING PREDICTION FOR MIXED-HARDENING METALS IN DEEP-DRAWING PROCESS

Document Type : Original Article

Authors

1 Graduate student, Dpt. of Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.

2 Professor, Dpt. of Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.

Abstract

ABSTRACT
Wrinkling in deep-drawing process was analyzed as the form of short-wavelength
shallow buckling modes based on the Donnell-Mushtari-Vlasov shell theory. The local
analysis considered the current deformed state of a sheet element in a doubly-curved,
biaxial plane stress state. The yield criterion for mixed-hardening metal used J2 yield
criterion for isotropic metal and Hosford’s yield criterion for anisotropic metal. The effect
of back stresses on wrinkling limit curves was investigated numerically.

Keywords