润滑组件壳体高温耐久开裂分析与改进

Regarding the problem that the housing of the lubrication component supporting an aero-engine oil system cracks during high-temperature durability testing, macroscopic and microscopic inspection methods were used to locate the cause of the crack. Simulation analysis shows that the cracking position has a small fillet and insufficient stiffness, resulting in stress concentration, which is a hot spot for fatigue failure. At the same time, the high surface roughness of the cast further intensified the initiation of the crack. Design optimization has been made to the housing structure, including increasing internal rounded corners and adding reinforcing ribs. Simulation results show that the fatigue life has been increased by 1013 times after structural optimization. At the same time, the casting process was optimized, and the surface roughness was lowered by surface treatment of the casting core. The improved housing can pass the high-temperature durability test verification.