航空发动机燃滑油附件后盖裂纹原因分析与预防对策

针对某型航空发动机燃-滑油附件后盖同部位成批次出现裂纹的问题，提出了裂纹故障引导转移的避障策略。通过研究裂纹产生的主要原因，分析后盖不同部位所产生的裂纹可能对航空发动机造成的危害程度，调整改变原支撑结构，在后盖非关键部位形成新的应力集中点，降低关键部位应力集中区的应力幅值，迫使故障从不可修复的关键部位转移到可修复的非关键部位。经计算机仿真，确定了裂纹引导缺口的最佳参数；同时，仿真结果表明，裂纹故障引导转移策略合理可行。

The causal analysis and preventive measures for the fuel-oil accessories rear cover in the aero-engine

For the problems as the cracks appeared in batches?in the fuel-oil accessories rear cover, a new evadable?measure for the crack guide and devolvement is put forward. By researching the main cause of the cracks?and analyzing the extent of the damage caused by the cracks in different positions in the fuel-oil accessories rear cover for the aero-engine , It has changed the pristine support construction, so the new stress concentration point has formed and the stress amplitude in the key part of the stress concentration area has reduced, which makes the crack faults being transferred from the unrepaired key part to the repairable non-critical part. Through the computer simulation, the optimal parameters for the crack guided gap have been determined and the simulation result has showed that the evadable?measure for crack guide and devolvement is reasonable and practicable..