应用经典塑性理论的先决条件在于掌握屈服面的运动规律,这往往是比较困难的。同时,引入屈服面使本构关系在应力间中不连续,也给数值计算带来了不便。K.C.Valanis提出的内时塑性理论,放弃传统的对屈服面运动规律的研究,用有物理内涵的内蕴时间Z代替一个普适的绝对的牛顿时间T去量度不同材料的不可逆变形的历史,期望获得更准 The prerequisite for the application of classical plasticity theory is that it is often more difficult to grasp the law of movement of the yield surface. At the same time, the introduction of yield surface makes the constitutive relationship discontinuous in stress, which also brings inconvenience to numerical calculation. KCValanis put forward the theory of plasticity in time and abandoned the traditional research on the law of the movement of yield surface. Instead of using a universal absolute Newtonian time T to measure the irreversible deformation history of different materials with intrinsic time Z, Get more accurate