目前上限法不能方便地求出应力分布是一个严重的缺陷,限制了上限法在许多场合的应用,本文试图从上限推导结果中寻找应力球张量的计算方法,从而解决上限法中应力分布的求解问题。在上限法的推导过程中,首先须建立一个满足体积不变条件和速度边界条件的动可容速度场,在动可容速度场基础上可得到应变速率、上限功率和上限载荷。如果动可容速度场的近似程度很好,那么得到的应变速率、上限功率和上限载荷的近似程度也就很好。利用应力 At present, the upper limit method can not easily calculate the stress distribution is a serious flaw, which limits the application of the upper limit method in many occasions. This paper attempts to find the stress ball tensor calculation method from the upper limit derivation results, so as to solve the stress distribution in the upper limit method Solve the problem. In the process of deriving the upper bound method, a dynamic moving velocity field satisfying the volume invariant and velocity boundary conditions must be established. The strain rate, upper bound power and upper bound load can be obtained on the basis of the moving tolerable velocity field. If the approximation of the moving velocity field is good, then the resulting strain rate, the upper limit power, and the approximate upper load limit are also good. Utilize stress