承受拉-扭组合载荷的薄壁圆筒屈服时产生塑性流动的条件

Study on the Conditions of Plastic Flow for Thin Tube under Tension and Torsion

提出了在无外力作功的情况下 ,具有Bauschinger效应的弹塑性材料处于屈服状态产生自发的塑性流动时应满足的条件 .这个条件不仅与材料的力学性能有关 ,而且还处决于材料的具体的载荷边界条件和变形 .举例说明了承受拉 扭组合的薄壁圆筒中 ,采用组合强化模型时 ,产生塑性流动的具体条件 .

A rate-independent elastic-plastic material with Bauschinger effect may undergo spontaneous plastic flow in a workless way if some additive condition meets. The condition presented here is not only dependent on the mechanical properties of the material, out also on the loading boundary condition and deformation. An explicit example is presented finally, A thin tube under tension and torsion is worked out to examine how it can produce spontaneous plastic flow when it yields.