.The P-type rubber clamp is an important connector to connect pipelines,supports,and gearboxes in the external piping system of an aircraft engine.The main failure form of the clamp is fatigue fracture under the combined action of external vibration and high-pressure liquid pulsation inside the pipelines.The fatigue failure of clamps greatly restricts the performance of piping systems.Thus it is of great significance to study the fatigue performance of clamps.Firstly,tension-compression fatigue tests of the clamps are designed and conducted and the corresponding fatigue lives under different loading displacements are obtained.Subsequent fracture analysis shows that the fatigue failure of the clamp exhibits two different forms:The one is the fatigue fracture of metal band on the clamp extending from the outside to the inside and the other is the severe wear of rubber washer on the clamp.Secondly,based on the loading process of the tests,the corresponding finite element model is established and the predicted accuracy of the constructed model is further verified by comparing the strain at the strain gauge location.Then,based on the fatigue test results of the stainless steel used in the clamp band,the SWT(Smith-Watson-Topper),FS(Fatemi-Socie),and WB(Wang-Brown)critical plane fatigue life models of the clamp are established for the fatigue fracture the clamp band.Finally,by combining with the maximum stress and strain which are obtained from finite element analysis and the fatigue life results obtained from the tension-compression fatigue test of the clamps,it is verified that the proposed life models are all within the triple dispersion band and have good estimation accuracy for the fatigue life of the clamp.
关键词
P型橡胶卡箍/拉压疲劳/断口分析/临界平面模型/疲劳寿命预测
Key words
P-type rubber clamp/tension-compression fatigue/fracture analysis/critical plane model/fatigue life prediction
维普
万方数据