含缺陷轮盘失效概率分析流程与数值模拟

The traditional turbine disk life prediction method does not consider the initial defects of the material, so it is impossible to predict the life of disk with defects accurately. Based on the distribution characteristics of defects produced in the different manufacturing processes, the failure probability of a turbine disk caused by defects was analyzed, focusing on the bore surface defects caused by the manufacturing process as well as the inherent material surface, sub-surface and internal defects. With the consideration of randomness of the initial defects, stress, inspection time and detectable levels, the probability of failure analysis process in the aero-engine turbine disk with defects was built. Furthermore, the analysis methods of the turbine disk with inherent defects was ameliorated, and the turbine disk was divided into four zones in which the surface zone was ulteriorly classified as surface, sub-surface and inside three parts. Finally by writing a C++ program the probability of failure analysis method was verified, and the conclusions obtained have engineering reference value. The proposed method has higher computational efficiency with the satisfied precision, and the influence about scatter of stress level, scatter of detection time and simulation times on failure probability was discussed.