On Finite Orthotropic Elastic-Plastic Necking Deformation of a Round Bar

The major aim of this paper is the research of finite deformation of orthotropic elastic plasticity for a round bar under tension. Meanwhile, on the basis of multiplicative decomposition concept, a finite element method suitable to calculating the finite orthotropic elastic plastic deformation has been suggested. The simulated results of the orthortropic finite plastic deformation of a bar made of orthortropic plastic material under large strain tension show the shape of the necking section of the bar is elliptic, and there are very evident differences in mechanical behavior and in defferent directional necking deformation when the tension is in different orientation.