CAJ | 학술논문

以σ-N曲面为基础,并由应力幅值σa和平均应力σm构建Goodman型和Gerber型广义σ-N曲面方程,对涡轮盘进行疲劳寿命估算.由某型航空发动机涡轮盘算例结果显示,基于Gerber型等寿命曲线的估算寿命比Goodman型更接近于其真实额定寿命,且该方法无需循环应力等效转换,从而提高了疲劳寿命估算的精度.
이σ-N곡면위기출,병유응력폭치σa화평균응력σm구건Goodman형화Gerber형엄의σ-N곡면방정,대와륜반진행피로수명고산.유모형항공발동궤와륜반산례결과현시,기우Gerber형등수명곡선적고산수명비Goodman형경접근우기진실액정수명,차해방법무수순배응력등효전환,종이제고료피로수명고산적정도.
@@@@On the basis of theσ-N curved surface, the fatigue life of turbine disk is investigated in this paper by constructing Goodman and Gerber types of generalizedσ-N curved surface equation based on stress amplitude and mean stress. An example of an aircraft engine turbine disk is presented to validate the proposed method, and the results show that the prediction from Goodman equivalent life curve is much better than that of Gerber type model. In addition, there is no need to equivalently convert the cyclic stress in above method. This method can improve the accuracy of fatigue life estimation.