一种新的航空发动机叶片疲劳试验方法

摘要

在某型航空发动机叶片疲劳试验件数量严重不足的情况下,提出一种新的航空发动机叶片疲劳试验方法-逐级载荷加载法.该方法先以一个相对较低的振动水平对叶片进行激励,然后逐级加大叶片的激励水平,直至叶片出现疲劳破坏,最后获取该叶片的疲劳极限.应用该方法对某型发动机第5级轴流压气叶片进行疲劳试验,有效地获取该叶片的疲劳极限.%Due to the serious shortage of specimens for fatigue test of aero-engine blades, a new fatigue test method for aero-engine blades, called step-by-step loading method, is proposed. Firstly, the blade is excited with a relatively low vibration. Then, excitation level on the blade increases step by step until the blade fails. Thereby, the fatigue limit of the blade is obtained. Practical application in the fatigue test of the 5th-stage axial compressor's blades shows that this method is efficient for obtaining the fatigue limit of the blades.