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为建立能准确描述2198-T3态铝锂合金充液拉深成形的本构模型并合理制定成形工艺参数,采用单向拉伸实验测定2198-T3态铝锂合金0°、45°、90°方向的真实应力-应变曲线,并通过不同本构方程拟合材料变形抗力曲线。结果表明,具有初始屈服应力的幂函数本构方程对板材不同方向的试验数据拟合较好;2198-T3态铝锂合金板材塑性应变比r为0.931,具有良好的拉深性能;采用DYNAFOM有限元分析软件对充液拉深成形过程进行数值模拟,并对获得的成形性能参数进行验证。
In order to establish a constitutive model that can accurately describe the hydroforming process of 2198-T3 aluminum-lithium alloy and to rationally set the forming process parameters, the uniaxial tensile test was used to determine the mechanical properties of 2198-T3 aluminum-lithium alloy at 0 °, 45 ° and 90 ° Direction of the true stress-strain curve, and through different constitutive equations to fit the material deformation resistance curve. The results show that the constitutive equation of power function with initial yield stress fits well with the experimental data in different directions of the plate. The plastic strain ratio r of 2198-T3 aluminum-lithium alloy plate is 0.931, which has good drawing performance. With DYNAFOM finite Meta-analysis software was used to simulate the process of liquid-filled drawing. The obtained formability parameters were verified.