特别是下限定理的应用困难很大。
Moreover, the application of lower bound theorem is especially difficult.
极限分析理论采用塑性上、下限定理为稳定性的真解提供了限界。
Limit analysis takes advantage of the lower-and upper-bound theorems of plasticity theory to provide bounds on the true solution of a stability.
根据下限定理，构造了满足完全平衡条件、边界条件和屈服条件的静力许可场；
The block-structural plane model is used for constructing the statically admissible stress fields which satisfy the equilibrium conditions, boundary conditions and yield criteria.
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