本文给出平面应力状态诸工序在屈服轨迹上的应力分区,由图1可以直接看出三个互相垂直主方向上的尺寸变化情况。文章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Mises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σm及代表应变特征的角θ为纵横坐标的应力平面图和各区域之间边界线的方程,还给出了角θ与Lode系数μσ之间的关系,最后给出典型塑性成形工序在图3中的部位,由图3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。
The division of stress on the yield locus in metal forming processes of plane stress is presented. The tendency of variation of three orthogonal size of workpiece is illustrated in Fig. l. It is assumed that. unrolling the Mises circular cylinder to a plane is a convenient method, and σ_m-θ stress plane is given first(σ_m-mean stress,θ—characterized strain angle). And the equations of interface between various regions are also given. Finally, the location of typical metal forming processes in stress plane has been illustrated in Fig.5 from which the tendency of variation of three orthogonal size may be judged and the resistance and plasticity of metal forming processes may also be compared.
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