本文以连续损伤力学(CDM)的经典损伤理论为基础，对疲劳、蠕变及其交互作用下的损伤演化分别进行了研究，进而推导出了一个新的新的疲劳-蠕变交互作用的损伤模型。为将上述模型方便的运用于工程实际之中，本文通过1.25Cr0.5Mo钢光滑试样540℃环境下应力控制的梯形波加载实验，对工程中容易测量的轴向变形即平均应变的变化规律进行了研究，选取平均应变的变化作为损伤变量，用上述模型进行了1.25Cr0.5Mo钢光滑试样540℃下的疲劳-蠕变交互作用的损伤描述，结果表明实验损伤点与该模型的损伤演化规律符合较好。另外，在上述模型和平均应变变化规律的基础上，本文还对工程上如何进行失效判定进行了一定的探讨。
Based on the continuum damage mechanics, a new damage model has been developed for fatigue-creep interaction in this paper. This model researched the damage of fatigue, creep and their interaction respectively. In order to apply this model to the practical engineering condition, fatigue-creep interaction experiments have been carried out to research the damage evolution. These tests are conducted at 540℃ under stress control, using a trapezium waveform with the hold-time per cycle. Cylindrical specimens of 1.25Cr0.5Mo steel were used in the fatigue-creep interaction experiments. According to the experiments, the changing rule of mean strain has been studied in this paper. Defining the change of mean strain as the damage variable, damage curves of different stress ranges have been obtained based on the damage model the above damage model. Results showed that the values of damage calculated from the damage variable definition mentioned above were in good agreement with these damage curves. Besides, based on the damage model and the change rules of mean strain, this paper also discusses the failure assessment in engineering. A method to prevent the rupture of engineering components has been proposed in this paper.
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