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为研究塑性变形体中金属流动方向与局部应力场之间的关系,首先给出塑性变形中局部应力场的平均应力梯度的近似求解算法,并计算圆柱体镦粗、圆环镦粗和正挤压塑性区等典型轴对称应力场中各点的平均应力梯度方向。将应力场中各点的平均应力梯度方向和速度方向同时可视化,并对比统计二者的相似程度,结果显示在轴对称应力场中质点的流动方向与平均应力梯度方向大致保持一致。将变形区中各点的运动分解为刚体运动和相对运动(流动)两个分量,认为刚体运动主要由工具运动决定;在不考虑刚体运动的情况下,轴对称塑性变形区中的质点流动方向与附近区域的局部应力场在该点的平均应力梯度方向大致保持一致。
In order to study the relationship between the direction of metal flow and the local stress field in plastic deformation, an approximate solution to the average stress gradient of the local stress field in plastic deformation is given first, and the calculation of cylinder upsetting, ring upsetting and positive extrusion Plastic zone and other typical axisymmetric stress field in the direction of the average stress gradient. The average stress gradient direction and velocity direction of each point in the stress field were simultaneously visualized and the similarities were compared. The results show that the flow direction of the particle in the axisymmetric stress field is approximately the same as the direction of the average stress gradient. The motion of each point in the deformation zone is decomposed into two components of rigid body motion and relative motion (flow), and the rigid body motion is mainly determined by the tool motion. In the case of rigid body motion, the particle flow direction in the axisymmetric plastic deformation zone And the local area of the local stress field at this point in the direction of the average stress gradient remains roughly the same.