基于最大二阶主应变和Savitzky-Golay平滑原理对热轧酸洗板成形极限的数值模拟

摘要

通过ABAQUS有限元软件对热轧酸洗板的半球形凸模胀形试验进行数值模拟,分析了热轧酸洗板在成形过程中发生全局颈缩的位置,采用Savitzky-Golay平滑原理对主应变一阶、二阶导数进行拟合得到二阶主应变随时间的变化曲线,基于最大二阶主应变准则预测了热轧酸洗板的成形应变极限,并与试验结果进行对比.结果表明:基于有限元模拟和数据拟合得到的成形极限略低于试验测试值,主应变的最大误差为2.2％,模拟结果与试验结果吻合较好,此数值模拟方法可用于热轧酸洗板的成形极限预测.%Finite element software ABAQUS was used to simulate the hemispherical punch stretching tests of hot rolled pickling sheet.The location of global necking in the forming process of pickling sheet was analyzed.The first-order and second-order derivative of the principal strain were fitted by the Savitzky-Golay smoothing principle to obtain the curve of second-order principal strain with time.The forming strain limit of hot rolled pickling sheet was predicted based on the maximum second-order principal strain criterion,and compared with the experimental results.The results show that the forming limit based on finite element simulation and data fitting was slightly lower than the experimental results.The maximum error of the principal strains was 2.2％.The simulation results were in good agreement with the experimental results,which could be used to predict the forming limit of hot rolled pickling sheet.