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本文着重对三向应力状态如何在屈服轨迹上分区进行讨论,认为将Misis 圆柱展开为平面是比较方便的一种方法,首次给出用平均应力σ_m 及代表应变特征的角θ为纵横座标的应力平面图。给出各区域之间边界线的方程。还给出了角θ与Lode 系数μ之间的关系。最后给出典型塑陛成形工序在图中的部位,由图可以判断各方向尺寸变化趋向,及各工序的塑性与抗力相对大小。
This article focuses on how the three-dimensional stress state in the yield trajectory zoning discussion, that Misis cylindrical flat is a more convenient method, for the first time with the average stress σ_m and represents the angle θ of the strain characteristics of the vertical and horizontal coordinates of the stress Floor plan. Give the equation of the boundary line between regions. The relationship between the angle θ and the Lode coefficient μ is also given. Finally, the typical plastic forming process in the figure is given. The figure can be used to determine the trend of dimensional changes in all directions and the relative plasticity and resistance of each process.