Fir‐tree tenon structure, as a commonly used scheme in the connection of turbine blades and discs, plays a critical role in the reliability and integrity of aeroengine turbines. This work mainly deals with the contact and fatigue analyses of a turbine disc–blade attachment with fir‐tree tenon structure. Firstly, based on Hertz contact theory, a three‐dimensional (3D) model of surface‐to‐surface contact is established, and contact stress analysis is performed based on finite element (FE) simulations. The simulated contact stress distribution agrees well with the Hertz contact theory. Particularly, the rounding processing does not relieve the stress concentration. Then, contact stress analysis on the fir‐tree tenon structure is performed, and a stress gradient‐based model is utilized for fatigue life evaluation together with contact stress analysis. Results show that the proposed solution yields acceptable predictions compared with field estimations.

中文翻译：

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枞树榫结构的涡轮盘-叶片附件的接触应力分析和疲劳寿命预测

枞树榫结构是涡轮叶片和圆盘连接中的常用方案，对航空发动机涡轮的可靠性和完整性起着至关重要的作用。这项工作主要涉及具有杉木树榫结构的涡轮盘叶片附件的接触和疲劳分析。首先，基于赫兹接触理论，建立了表面到表面接触的三维（3D）模型，并基于有限元（FE）模拟进行了接触应力分析。模拟的接触应力分布与赫兹接触理论非常吻合。特别地，修圆处理不能减轻应力集中。然后，对枞树榫结构进行接触应力分析，并将基于应力梯度的模型与接触应力分析一起用于疲劳寿命评估。