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对X80板材建立了预弯状态下的有限元ANSYS模型,考虑了X80钢的材料应力-应变曲线及板材与模具接触等非线性因素,进行了弹塑性变形及应力非线性分析。模拟了不同跨距下0.06 m厚的X80板材在预弯状态下的弹塑性变形、等效应变和等效应力分布,得到发生弹性变形和塑性变形的临界跨距值。随着跨距增大,弹塑性变形亦呈增大趋势,并且随着应变的增加,塑性应变在材料总应变中所占比重越来越大。同时结合理论计算,将施加不同边界约束条件及模具跨距的板材预弯弹性压下量仿真结果与理论值进行了对比,在一定程度上对仿真分析进行了验证。在既定条件下,跨距与板材塑性变形并不成纯粹的正比关系,在实际工程应用中要考虑两者间的最佳配比关系。
The finite element ANSYS model of pre-bent state of X80 sheet was established. The nonlinear stress-strain curves of X80 steel and the contact between the sheet and the mold were taken into account. The elastic-plastic deformation and stress nonlinear analysis were carried out. The elastic-plastic deformation, equivalent strain and equivalent stress distribution of X80 sheet under 0.06 m thickness under different span are simulated to obtain the critical span value of elastic deformation and plastic deformation. As the span increases, the elastic-plastic deformation also increases, and as the strain increases, the plastic strain becomes more and more important in the total strain of the material. At the same time, with the theoretical calculation, the simulation results of plate pre-bending elastic reduction with different boundary constraints and die span are compared with the theoretical values, and the simulation analysis is verified to a certain extent. Under given conditions, the span and the plastic deformation of the sheet are not purely proportional relationship, in the practical engineering applications to consider the best ratio between the two.