A phenomenological model of brittle fatigue fracture in metals and alloys is discussed in the case of proportional (simple) loading. The model is formulated in the framework of the physico-mechanical approach as a system of hypotheses concerning the probability of defect evolution at various scale-structural levels, such as micro- and macrocracks. The described constitutive relations are based on this model. A number of fatigue curves are obtained for various limit states of metals.

中文翻译：

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考虑结构变化的复杂应力状态下的金属疲劳断裂

在比例（简单）载荷情况下，讨论了金属和合金中脆性疲劳断裂的现象学模型。该模型在物理机械方法的框架内被公式化为一个假设系统，该假设系统涉及各种尺度结构级别（例如微裂纹和宏观裂纹）的缺陷演化概率。所描述的本构关系基于该模型。对于金属的各种极限状态，获得了许多疲劳曲线。