发动机材料高周疲劳P-S-N曲线优化处理方法

Optimized processing method of P-S-N curves for high cycle fatigue of aero-engine materials

材料的高周疲劳P-S-N曲线是发动机强度设计的重要依据。根据航空发动机材料高周疲劳P-S-N曲线的数据处理要求,提出拟合模型的选用判据以及中/高寿命区之间临界点的判别方法,并基于此进一步提出高周疲劳PS-N曲线的优化处理方法;随后以航空发动机中常用的两种钛合金材料为对象,利用本方法实现批处理,获得不同条件下的高周疲劳P-S-N曲线,最后比较与传统方法在处理时间上的差异。结果表明:该数据处理方法不但适用于常规高周疲劳性能数据处理,还适用于超高周疲劳性能数据处理,其处理效率显著提升。

High cycle fatigue P-S-N curve of material are important for the design of aero-engine strength.Based on the data processing requirement of the high cycle fatigue of aero-engine materials,a novel data processing method has been developed by proposing the criterion of selecting fitting model and the method for determining the critical stress between the medium and high fatigue cycle regions.Furthermore,the testing data of two common Ti-alloy materials in aero-engine are used to validate the present batch processing method,and the P-S-N curves in various conditions have been obtained.And the comparison of the process time between the present method and the conventional method has been conducted finally.The results show that the present data processing method is suitable not only for the data processing of the traditional high cycle fatigue issues,but also for the data processing of very high cycle fatigue issues.And the efficiency of data processing is significantly improved.