正齿轮传动装置齿根三维疲劳裂纹起始、扩展和疲劳寿命分析

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-30 DOI:10.1016/j.tafmec.2024.104741

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引用次数: 0

摘要

航空齿轮系统中的齿轮在高速、重载和载荷交变的工作条件下容易发生疲劳断裂。因此，本文提出了一种多啮合位置加载形式的数值计算模型，以分析这些齿轮的疲劳裂纹萌生和扩展行为，并估算其疲劳寿命。齿轮的疲劳寿命通过分别计算疲劳裂纹萌生寿命和疲劳裂纹扩展寿命来确定。采用 Smith-Watson-Topper 准则和临界平面法的多轴向疲劳寿命预测方法计算齿根疲劳应力和疲劳起始寿命。然后，在有限元（FE）软件中计算齿根应力应变场，并在三维（3D）裂纹分析软件中计算裂纹尖端的应力强度因子。然后，分别得出齿根疲劳裂纹扩展轨迹和疲劳裂纹扩展寿命。最后，分析了加载条件、齿轮几何参数和初始裂纹位置对齿根疲劳裂纹起始寿命、扩展寿命和疲劳裂纹扩展轨迹的影响机理，并建立了齿疲劳试验台，用于验证裂纹扩展轨迹。

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Analysis of tooth root three-dimensional fatigue crack initiation, propagation, and fatigue life for spur gear transmission

The gears in aviation gear systems are susceptible to fatigue fracture due to high-speed, heavy-load, and load alternation operating conditions. Therefore, a numerical calculation model with multiple mesh positions loading form has been proposed in this paper to analyze the fatigue crack initiation and propagation behavior, and to estimate the fatigue life of these gears. The fatigue life of the gear is determined by separately calculating the fatigue crack initiation life and the fatigue crack propagation life. The tooth root fatigue stress and the fatigue initiation life are calculated by the multi-axial fatigue life prediction method with the Smith-Watson-Topper criterion and the critical plane method. Afterwards, the tooth root stress–strain field is calculated in Finite element (FE) software and the stress intensity factors of the crack tip are calculated in three-dimensional (3D) crack analysis software. Then, the tooth root fatigue crack propagation trajectory and the fatigue crack propagation life are obtained separately. Finally, the influence mechanism of the loading conditions, the geometry parameters of gears, and the initial crack positions on the tooth root fatigue crack initiation life, propagation life, and fatigue crack propagation trajectory are analyzed, and a tooth fatigue test bench is built for verifying the crack propagation trajectory.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.