A System Approach to Contact Fatigue Life Estimation of Right-Angled Geared System

Srikumar C. Gopalakrishnan, Abhijit Nilangekar, J. Chung, Yogesh Mehta, B. Kanade
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Abstract

The right-angled geared systems are used in automotive and aerospace applications. Most of the right-angled geared systems fail due to contact fatigue. Several articles reported discussing contact fatigue failure of parallel axis geared systems, and the contact fatigue conditions of hypoid and spiral bevel geared systems are seldom studied. This work aims to bridge the gap and proposes a simplified method to model contact fatigue in the right-angled geared system under dry contact conditions. Initially, the gear contact is modeled using a tooth contact analysis methodology for a given load, speed, and operating conditions. The above step is followed by obtaining stress histories based on suitable interpolation conditions, finite element computation, and Hertzian contact conditions. These stress histories form the basis of the Characteristic plane method. The contact fatigue life of the gears is calculated based on the equivalent bending amplitude of a multiaxial stress condition. The equivalent bending amplitude is then used to determine the number of cycles of operation the gear can endure from the SN-curve for that material. This method is then used to perform parametric analysis based on the size, material type, and gear contact ratio.
直角齿轮传动系统接触疲劳寿命估算的系统方法
直角齿轮传动系统用于汽车和航空航天应用。大多数直角齿轮传动系统由于接触疲劳而失效。关于平行轴齿轮传动系统接触疲劳失效的研究已有多篇报道,而对准双曲面齿轮传动系统和螺旋锥齿轮传动系统接触疲劳条件的研究却很少。本工作旨在弥补这一空白,并提出了一种简化的方法来模拟直角齿轮传动系统在干接触条件下的接触疲劳。最初,齿轮接触是使用齿接触分析方法建模给定负载,速度和操作条件。然后根据合适的插补条件、有限元计算和赫兹接触条件获得应力历史。这些应力史构成了特征面法的基础。基于多轴应力条件下的等效弯曲幅值计算齿轮的接触疲劳寿命。然后使用等效弯曲幅度来确定齿轮可以从该材料的sn曲线承受的操作周期数。然后使用该方法进行基于尺寸,材料类型和齿轮接触比的参数分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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