Optimization Design Based on Response Surface Method and Creep Fatigue Life Calculation of C-type Metal Sealing Ring

The creep of metal seal ring of aero-engine is one of the main reasons for its failure under high temperature load. In order to optimize the structural design of the metal seal ring to meet the creep fatigue life requirements, the influence of each single element on the sealing performance of the C-type metal seal ring has been studied. On this basis, an optimization design method based on the response surface method is proposed. Considering the coupling effect of various parameters, the C-type ring structure is optimized, and the fatigue life of the C-type ring is verified based on the working life of a certain engine with 2000 hours of overhaul. The results show that the maximum equivalent stress increases with the increase of compression and material thickness, and the rebound rate decreases with the increase of compression and material thickness. Nevertheless, the change of contact stress is complex. When the plate thickness is less than 0.25 mm, the maximum contact stress increases with the increase of compression and material thickness. When the plate thickness is 0.30 mm, the maximum contact stress increases firstly and then decreases with the increase of compression. The structural dimensions optimized by response surface method meet the fatigue life requirements.