Based on the elasto-plastic finite deformation theory,a finite elementmodel has been developed with Updated Lagrange description used for analysis of the bending of a bar. The isotropic elastio-plastic constitutive equation for metal is adpoted.

• 基于弹塑性有限变形理论，采用UpdatedLagrange描述建立了用于棒料弯曲成形分析的弹塑性有限元数学模型，给出了各向同性金属材料的弹塑性本构方程；