条带屈服模型预测较准确但需要数值迭代求解，计算量大，且程序复杂，不利于工程应用；
Of these, the strip yield models can make precise predictions for the overloading effect, but they are too complicated for engineering applications.
基于带状屈服模型的数字仿真方法在航空航天结构上已经开展运用，但尚未用于潜艇结构疲劳断裂问题。
The numerical simulation method based on the strip-yield method has begun to be used in the air space structures, but not used in the fatigue questions in the submarine.
对封闭型分级单屈服面模型参数中的阶段改变参数和硬化参数的优化进行了研究。
In this paper, optimization of phase change parameter and hardening parameter of closed hierarchical single surface model is studied.
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