Contact fatigue limit prediction method for heavy-duty gears considering hardness gradient characteristics

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Boyu Zhang, Yongyong He, Zhengwei Wang
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Abstract

Hardening gradients have been introduced to heavy-duty gears to enhance their bearing capacity, but this has led to an increase in the complexity and difficulty of fatigue analysis. To explore ways to mitigate this, in this work, a contact fatigue model of an 18CrNiMo7-6 gear pair with a hardness gradient was established, and the Brown‒Miller‒Morrow multiaxial fatigue criterion was adopted to calculate the contact fatigue lifespan under different contact pressures. The gear contact fatigue limit was then determined by fitting the stress–number of cycles (SN) curve. The results of this method are verified by gear contact fatigue tests. Furthermore, the effects of case hardening depth (CHD) and surface hardness (SH) on the contact fatigue lifespan and limits were explored, and we found that the contact fatigue limit of a typical carburized gear was more affected by SH than CHD. In addition, we also examined which hardness gradients were more beneficial for the fatigue performance of gears with atypical hardening gradients.

Abstract Image

考虑硬度梯度特性的重载齿轮接触疲劳极限预测方法
硬化梯度已被引入到重载齿轮,以提高其承载能力,但这导致了疲劳分析的复杂性和难度的增加。为此,建立了具有硬度梯度的18CrNiMo7-6齿轮副的接触疲劳模型,采用Brown-Miller-Morrow多轴疲劳准则计算了不同接触压力下的接触疲劳寿命。然后通过拟合应力-循环数(S-N)曲线确定齿轮接触疲劳极限。通过齿轮接触疲劳试验验证了该方法的有效性。进一步探讨了表面硬化深度(CHD)和表面硬度(SH)对接触疲劳寿命和极限的影响,发现表面硬化深度对典型渗碳齿轮接触疲劳极限的影响大于表面硬化深度对接触疲劳极限的影响。此外,我们还研究了哪种硬度梯度对非典型硬化梯度齿轮的疲劳性能更有利。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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