航空发动机叶片突丢后动载荷对螺栓强度的影响

Effects of dynamic load on aero-engine bolts after blade-out

航空发动机使用过程中,若发生叶片丢失,除了会导致非包容性破坏外,还会产生动态载荷,从而可导致发动机的连接螺栓破坏,引发更大的故障。针对风扇试验件试验时因叶片丢失而引发的连接螺栓断裂故障,计算了单个风扇叶片丢失后转子支点处产生的动态载荷,分析了动态载荷作用下危险截面处螺栓的应力,并结合断口分析结果验证了分析结果的正确性。本研究成果可为航空发动机转子在叶片丢失情况下的强度设计提供极限载荷输入。

If aero-engine blade-out occurs in engine operation, it may cause engine connecting bolts fail？ure besides the non-containment destruction. By calculating the dynamic loads after a single blade-out, the bolt stress of the dangerous section caused by dynamic loads was analyzed. Combining with fracture analy？sis results, it can be found the theoretical analysis is correct. This research provides a theoretical basis for the safe operation of aero-engine rotor.