考虑局部应力效应的轮盘子午面破裂转速预测

Prediction result of burst speed of a aeroengine disk is usually slight larger than testing result when using the average stress method. The error tends to be much larger especially for the disk with a bolt hole. The average stress method was modified taking consideration of the effect of local stress.A correction factor was implanted to distinguish weight effect of the average hoop stress from that of the local stress of critical position at disk burst speed. Tensile test of standard cylinder and notched specimens of GH4169 and burst speed measurement test of two simulated disks were carried out. Notch strength ratio related to correction factor was calculated. Then the relationship between correction factor and notch strength ratio was obtained. Burst speed of a disk was predicted using these two methods and the burst speed measurement test was conducted. It concluded that the predicted result was larger than test data when using the average stress method with the error of 9.4%. When local stress was taken into consideration, the result was closely approximated to test data with the error of 2.67%. The prediction method of hoop mode burst speed of a disk considering local stress effect was of remarkable engineering practical worth value to its' simple formality and the reliable results.