抛物线模拔圆棒的曲面积分问题

Integration of Curved Surface of Round Bars by Parabolic Drawing Dies

采用ＶｏｎＫａｒｍａｎ基本假设对模面函数为抛物线（又称喇叭模）的轴对称拔制问题设定了运动许可速度场，并经曲面积分与变上限积分得到拔制应力上界解析解．

Based on Von Karman basic hypothesis,a kinematically allowed velocity field for axisylnmetric drawing through a parabolic die is established. By curved surface integration and variable upper bound integration an upper bound analytic solution is obtained for drawing stress.