文中证明，特征线法的应力关系式与本文的屈服条件、屈服函数的极值条件是相同的。
When the material does not display a yield point, a quantity known as the proof stress is used when making design calculations.
对屈服条件与屈服函数的极值条件进行了讨论，在不需要流动法则的情况下建立了速度方程。
The extreme conditions of yield condition and yield function are discussed; and a velocity equation is established under the condition that no flow rule has been required.
分析迁移应力，确定了真实应力空间中的屈服函数，并采用旋转硬化规律考虑应力引起的土体各向异性。
Then the shift stresses were analyzed to specify the yield locus in true stress space and rotational hardening law was adopted to embody the anisotropy induced by stresses.
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