The crack growth behavior of Hastelloy X under creep-fatigue interaction at high temperature is investigated by a nonlinear creep-fatigue interaction damage model. Multiaxial stress is considered both in the fatigue and creep damage models. The effect of the variance of fatigue damage parameters is analyzed in a quantitative method and some linear effects were observed. The influence of hold time, crack depth ratio and load level on the crack growth behavior are studied and results under different hold time indicate that the increase of hold time, crack depth ratio and load level enhances the creep damage and accelerates the time-dependent crack growth rate. When the hold time varies from 1 to 60 min, the creep damage always dominates the damage accumulation, which can explain the overlap of the curves between da/dt and (C_t)_avg observed in the experiment very well. The damage contributions of creep, fatigue, and their interaction are quantized thanks to the independent damage model for each part: (1) when the hold time increases from 1 min to 60 min, the creep damage ratio rises from 70% to 99% and the interaction damage ratio decreases from 25% to 1%. (2) when the crack depth ratio increases from 0.35 to 0.5, the creep damage ratio rises from 80% to 90% and the interaction damage ratio decreases from 15% to 10%; (3) when the load level increases from 4200 N to 5000 N, the creep damage ratio rises from 75% to 90% and the interaction damage ratio decreases from 25% to 10%. It is also shown the increase of load level and crack depth ratio lead to the increase of equivalent stress and therefore enhances the creep damage and accelerates the crack growth rate.

通过非线性蠕变-疲劳相互作用损伤模型研究了Hastelloy X在高温下的蠕变-疲劳相互作用下的裂纹扩展行为。在疲劳模型和蠕变损伤模型中都考虑了多轴应力。用定量方法分析了疲劳损伤参数方差的影响，并观察到一些线性影响。研究了保温时间，裂纹深度比和载荷水平对裂纹扩展行为的影响，不同保温时间下的结果表明，保温时间，裂纹深度比和载荷水平的增加会增强蠕变损伤并加速随时间变化的裂纹。增长率。当保持时间在1到60分钟之间变化时，蠕变损伤始终占损伤累积的主导地位，这可以解释d a之间的曲线重叠。/ d t和（C _t）_平均在实验中观察得很好。通过每个部分的独立损伤模型，可以量化蠕变，疲劳及其相互作用的损伤贡献：（1）当保持时间从1分钟增加到60分钟时，蠕变损伤比率从70％上升到99％，并且互动伤害率从25％降低至1％。（2）当裂纹深度比从0.35增加到0.5时，蠕变破坏率从80％上升到90％，而相互作用破坏率从15％下降到10％；（3）当载荷水平从4200 N增加到5000 N时，蠕变破坏率从75％上升到90％，而相互作用破坏率从25％下降到10％。还显示出载荷水平和裂纹深度比的增加导致等效应力的增加，因此增加了蠕变损伤并加速了裂纹的生长速度。