基于响应面法的C型金属封严环优化设计及其蠕变疲劳寿命计算

在高温载荷作用下，蠕变是金属密封环失效的主要原因之一。为了优化结构设计，满足蠕变疲劳寿命要求，本研究针对C型金属密封环研究各单一要素对密封性能的影响规律，在此基础上提出基于响应面法的优化设计方法。考虑各参数耦合效应进行C型环结构优化，并基于发动机工作时长2000 h大修的工作寿命，对C型环进行疲劳寿命验证。结果表明:最大等效应力随压缩量和材料厚度的增大而增大，回弹率随压缩量和材料厚度的增大而减小。接触应力变化较为复杂，当板厚度小于0.25 mm时，最大接触应力随压缩量和材料厚度的增大而增大；当板厚度为0.30 mm时，最大接触应力随压缩量的增大先增后减。基于响应面法优化设计的结构尺寸满足疲劳寿命要求。

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.