考虑应力比及温度影响的粉末高温合金短裂纹扩展模型研究

Short crack growth has become the key to the fatigue life prediction of advanced powder turbine disks. In order to accurately simulate the short crack growth stage of powder superalloy materials，the effects of stress ratio and temperature on short crack growth of FGH96 powder superalloy were focused in this paper，and a method of short crack growth life prediction based on Tanaka model modification was established，which was engineering suitable. The crack closure parameters were used to characterize the effect of stress ratio and the thermodynamic theory was used to characterize the effect of temperature. The unified description of short crack growth law under different stress ratios and temperatures is achieved. Compared with the traditional model，it has significant advantages in prediction accuracy and engineering applicability，and the relative error with test results is less than 20%.