采用有限元软件MARC ,基于更新拉格朗日的弹塑性本构方程建立了一个有限元模型来模拟油底壳的成形过程。模拟得出了油底壳变形过程中板材的应力、应变、摩擦和厚度分布 ,揭示了成形过程中金属的塑性变形规律 ,并预测了可能发生失效的区域 ,为成形工艺设计提供了有效的分析工具 Using finite element software MARC, a finite element model was established to simulate the forming process of oil pan based on the Lagrange elastic-plastic constitutive equation. The stress, strain, friction and thickness distribution of the sheet during the deformation of the oil pan are simulated. The plastic deformation rules of the metal during the forming process are revealed and the predicted failure areas are predicted to provide an effective analysis for the forming process design tool