외연적 탄소성 유한요소법에 의한 단열전단밴드의 해석

Abstract

This paper is concerned with the shear band formation in sheet metal under dynamic loading. The shear band propagation is analyzed by an explicit elasto-plastic finite element code, which adopts the Johnson-Cook model to consider the effect of strain hardening, strain rate hardening and thermal softening. In the analysis, the constitutive equations are integrated over a time step by a modified PPEC method, which calculates the stress accurately in a single step without iteration. The study investigates the effect of the material constants in the Johnson-Cook model on the adiabatic shear band. The results show that the increase of the material constant A accelerates the shear band formation while the decrease of the material constant B, n, C, m accelerates the shear band formation.