基于多轴疲劳准则的齿轮点蚀寿命预测

综合齿轮动力学和弹性流体动力润滑理论，建立基于临界平面法多轴疲劳寿命预测模型. 首先根据齿轮啮合特性获取齿面接触的时变参数，采用平均滤波方法模拟齿面磨合后的粗糙状态，并将齿面粗糙形貌带入油膜厚度计算，并基于量纲化差分方法建立齿轮的热弹流动力润滑模型；随后，通过润滑界面压力和摩擦力的分布计算近表面应力状态，确定接触近表面任意平面的应力与应变幅；最终，采用临界平面方法计算Smith-Watson-Topper (SWT)参数和最易萌生裂纹的平面，最终确定齿轮疲劳点蚀寿命，并试验验证模型有效性. 结果表明：粗糙表面造成压力、油膜厚度和温度等波动较大，最大应力集中分布在表面，疲劳点蚀的微裂纹首先在表面萌生；齿轮疲劳点蚀数值模型可有效预测不同润滑条件下的疲劳点蚀寿命.

By integrating gear dynamics and elastohydrodynamic lubrication (EHL) theories, a multi-axial fatigue life prediction model based on the critical plane approach is established. First, time-varying parameters of gear tooth surface contact are obtained based on gear meshing characteristics. The average filtering method is adopted to simulate the rough surface state of gear teeth after running-in, and the tooth surface rough topography is introduced into the oil film thickness calculation. Furthermore, a thermoelastohydrodynamic lubrication model for gears is constructed via the dimensionalized difference method. Subsequently, the near-surface stress state is calculated using the distributions of lubrication interface pressure and friction force, and the stress and strain amplitudes of any plane near the contact area are determined. Finally, the critical plane approach is employed to calculate the Smith-Watson-Topper (SWT) parameter and the plane most prone to crack initiation, so as to determine the fatigue pitting life of the gear, and the validity of the model is verified through experiments. The results show that rough surfaces cause significant fluctuations in pressure, oil film thickness, temperature and other relevant parameters; the maximum stress concentration is distributed on the tooth surface, and microcracks of fatigue pitting initiate primarily on the surface. The proposed numerical model for gear fatigue pitting can effectively predict the fatigue pitting life under various lubrication conditions.

搜集汇总

背景与挑战

背景概述

该数据集由重庆大学的研究团队开发，专注于齿轮疲劳点蚀寿命的预测研究。通过结合齿轮动力学和弹性流体动力润滑理论，采用临界平面法建立多轴疲劳寿命预测模型，旨在有效预测不同润滑条件下的齿轮疲劳点蚀寿命。数据集包含2.66MB的文件，发布于2023年8月17日，采用CC BY 4.0许可协议开放共享。