【摘要】 将考虑静水应力和应变历史对材料损伤影响的Oyane损伤模型用于断裂的预测,将局部网格自适应和单元删除技术用于模拟裂纹的产生和扩展,在DEFORM-2D有限元模拟软件中建立了精冲轴对称模型,进行了弹塑性大变形有限元数值模拟.分析了成形过程中静水应力、等效应力、等效应变和损伤的分布以及发展趋势,分析了工艺参数对缺陷的影响规律,试验结果验证了模型的准确性.更多还原

【Abstract】 By using DEFORM-2D software,an axisymmetric FE model was created,and the Oyane ductile fracture model,which takes into account the influence of hydrostatic stress and stress-strain history on(material) damage,was used to predict the fracture of sheet metal.Local adaptive remeshing and element-deletion technologies were used to model the initiation and propagation of crack.Through using elasto-plastic large deformation FE simulation,the distributions and developing trends of σ_m,(σ),ε and damage were(predicted).The influencing laws of the process parameters on failure were analyzed by the FE simulation results which are in agreement with the experimental results.更多还原