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针对发动机轮盘孔结构的应力集中问题,以某高压涡轮盘安装边螺栓孔为研究对象,建立了涡轮盘非圆异形孔数学模型.该异形孔由双轴对称的8段圆弧光滑连接而成,并满足螺栓装配的要求.使用该异形孔模型取代了原螺栓孔.以有限元分析为基础对异形孔进行了优化,得到该轮盘安装边多圆弧异形螺栓孔的最佳形状.结果表明:优化后的多圆弧异形螺栓孔边第1主应力最大值降低了14.8%,孔边应力集中程度显著下降.设计参数灵敏度分析结果表明,与主圆弧相连的过渡圆弧的尺寸对孔边应力的影响较为显著,在设计中应予以重视.
In order to solve the problem of stress concentration in the wheel disk hole structure, the mathematical model of the non-circular hole of the turbine disk is established by taking the bolt hole of a high-pressure turbine disk as the research object. The irregular hole is composed of eight biaxial symmetrical arcs And meet the requirements of the bolt assembly.The original hole was replaced by the special hole model.According to the finite element analysis, the special hole was optimized and the best shape of multi-circular arc bolt hole was obtained. The results show that the maximum principal stress of the multi-circular arc shaped bolt hole is reduced by 14.8% and the stress concentration at the edge of the hole is significantly reduced.The sensitivity analysis results show that the size of the transitional arc The hole edge stress is more significant, should be paid attention to in the design.