基于广义N曲面的涡轮盘疲劳寿命预测.pdfVIP

第42 卷 第2 期 电 子 科 技 大 学 学 报 Vol.42 No.2 20 13年3月 Journal of University of Electronic Science and Technology of China Mar. 20 13 基于广义-N 曲面的涡轮盘疲劳寿命预测 廖 强，黄洪钟，朱顺鹏，何俐萍，凌 丹 (电子科技大学机械电子工程学院 成都 611731) 【摘要】以-N 曲面为基础，并由应力幅值 和平均应力 构建Goodman型和Gerber型广义-N 曲面方程，对涡轮盘进行 a m 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。 关 键 词 疲劳寿命; Miner准则; 名义应力法; S-N 曲线; -N 曲面 中图分类号 V231.95; O346.2 文献标志码 A doi:10.3969/j.issn.1001-0548.2013.02.026 Turbine Disk Fatigue Life Prediction Based on Generalized -N Surface LIAO Qiang, HUANG Hong-zhong, ZHU Shun-peng, HE Li-ping, and LING Dan (School of Mechatronics Engineering, University of Electronic Science and Technology of China Chengdu 611731) Abstract On the basis of the -N curved surface, the fatigue life of turbine disk is investigated in this paper by constructing Goodman and Gerber types of generalized -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. Key words fatigue life; Miner criterion; nominal stress method; S-N curve; -N surface 1) 建立广义-N 曲面，得到应力幅值 、平均 目前疲劳寿命预测方法主要有名义应力