利用最小厚度准则预测高强热轧钢板的FLC曲线

为更便捷地获得成形极限图(FLD)中的成形极限曲线(FLC),用最小厚度准则,通过少量成形极限试验结合数值模拟来预测FLC.采用Barlat1989屈服准则对QStE340TM、SAPH370、ZStE260P三种高强度热轧钢板进行成形极限模拟,并以最小厚度准则作为极限判据,根据数值模拟结果绘制FLC图.计算结果表明,采用平面应变路径下的成形极限实验数据作为最小厚度准则的已知参数时,数值预测结果与实验结果能较好吻合.故采用平面应变路径下的成形极限实验数据,结合最小厚度准则和数值模拟,即可得到材料完整的FLC曲线.

Application of minimum thickness criterion in forecasting FLC of high-strength hot rolled-sheet metal

In order to get forming limit curve(FLC) in forming limit diagram(FLD) more conveniently,we tried to forecast FLC with a few experiments and a kind of minimum thickness criterion combined with numerical simulation.Yield criterion of Barlat1989 was applied in forming limit simulation of three kinds of hot rolled sheet metal:QStE340TM,SAPH370 and ZStE260P.The Minimum thickness criterion was taken as a limit criterion.Good agreement between predicted FLC and experimental FLC has been achieved by knowing the experimental data under plane strain.It means if we combine the minimum thickness criterion with simulated data to derive FLC curve,only experimental data under plane strain path are needed,and that will be a very efficient way to get FLC.