Tribology Online

In this paper, the variations of the squeeze elastohydrodynamic lubrication (EHL) oil film in unidirectional and bidirectional intermittent motions are investigated theoretically. For the unidirectional intermittent motion, the effects of stop time, deceleration, elliptical ratio and applied load are explored. It is found that the variation of the central pressure, central and minimum film thickness in intermittent motion resemble those in an impact-rebound process with shorter intermittent period. However, the shapes of the pressure curves versus time are also influenced by the elliptical ratio and the applied load. It is also found that the bidirectional intermittent motion is more detrimental to the contact metals so that special attention should be paid in the design.

Duohuan Wu

Jing Wang

Motohiro Kaneta

Performance of EHL Oil Film in Intermittent Motion

A previously developed and validated model for the life of rolling/sliding heavily-loaded lubricated contacts, that separates surface and subsurface survival is now adapted to include the effect of material inhomogeneities and it is applied to the case of spur gear contact life. The previously used FFT-based, homogeneous elastic dry contact solver (for the calculation of pressure and subsurface stresses) is now replaced by a previously developed Lamé's equations solver based on Multigrid methods that can handle bonded inhomogeneities in an elastic media. Despite the increase in computing time by this change it still is able to generate gear solution calculations within one hour computing time in a personal computer. The effect of bonded inhomogeneities in rolling contact fatigue (RCF) is investigated for a variety of inclusion geometries and Young's modulus values. The results show how deterministically, or randomly distributed inclusions might shorten the RCF life of a component. In engineering practice this can be reflected in a reduction of the fatigue limit used.

Guillermo Enrique Morales-Espejel

Armando Félix-Quiñonez

Hugo Boffy

Tribology online

Stress Based Model for General Rolling Contact with Surface and Subsurface Survival: Application to Gears with Material Inhomogeneities

基于应力的通用滚动接触表面及亚表面生存模型：应用于具有材料不均匀性的齿轮

Izyan Iryani Mohd Yazid

Honami Yanagisawa

Fumiaki Aikawa

Hiroki Komata

Surface Damage Evaluation of Rolling Bearings Operating under Low Lambda Conditions

滚动轴承在低Lambda条件下的表面损伤评估

Matthew Misiaszek

Thomas Lengagne

Liang Guo

Durability of Aircraft Gas Turbine Mainshaft Ball Bearing Applying Surface and Subsurface Survival

飞机燃气涡轮主轴球轴承表面及亚表面存活的耐久性

This study investigated the dry sliding wear behavior of Cor-Ten steel, a material commonly used in harsh environments such as ports, sea bridges, and drilling rigs. Understanding how Cor-Ten steel performs in abrasive conditions is crucial for predicting potential wear issues. To assess its wear performance, tests were conducted using three types of abrasive balls: AISI-52100 steel, WC-Co, and Alumina. The wear tests involved a reciprocating ball-on-disc device at loads of 3, 7, and 10 N and sliding speeds of 0.4 mm/s and 0.8 mm/s. Results showed that the largest wear volumes occurred with the Alumina ball, while the AISI 52100 steel ball, despite its lower hardness, produced higher wear volumes than the WC-Co ball. Additionally, increased sliding speed led to higher wear volumes across all tests. SEM images revealed distinct wear tracks on both surfaces. These results provide valuable insights into the wear mechanisms of Cor-Ten steel, which can aid in optimizing material selection and maintenance strategies in marine construction.

Bilal Kurşuncu

Mustafa Sabri Gök

Sabri Alkan

Dry Sliding Wear Behavior of Cor-Ten Steel with Different Metallic and Ceramic Counter Bodies

不同金属和陶瓷对磨体下Cor-Ten钢的干滑动磨损行为

Spalling, which can be classified into sub-surface and surface-originated types, is a major failure mode of rolling bearings due to rolling contact fatigue (RCF). Sub-surface originated spalling typically has a much longer life than surface-originated spalling, indicating that rolling bearings may often exhibit excessive durability in normal environments. Highly accurate prediction of bearing life for sub-surface spalling would enable the more active use of smaller products and contribute to resource conservation. ISO 281 provides a framework for integrated life prediction, taking into account the effect of lubrication conditions. However, it does not consider the effect of non-metallic inclusions, which can lead to sub-surface originated spalling. Previous studies have identified the mode II stress intensity factor (SIF) as the key driver of spalling initiated by internal defects such as inclusions, based on RCF tests with small artificial defects. Therefore, this study derives a life model using the range of SIF. Additionally, a novel and practical method that combines the life model with the statistical data on inclusion sizes is proposed to predict Weibull plots of spalling life.

Sho Hashimoto

Tomoki Doshida

Hiroyuki Uchida

Koji Ueda

Spalling Life Prediction for Rolling Bearings Using a Model with Stress Intensity Factor and Statistical Evaluation of Non-Metallic Inclusions

滚动轴承剥落寿命预测：基于应力强度因子和非金属夹杂物统计评估的模型

An Electro-rheological (ER) fluid comprises dielectric particles blended in a non-conducting oil. The ER lubricants are commonly known as smart lubricants. This study utilizes an ER lubricant to examine the static and dynamic response of multi-lobe journal bearing. The lubricant flow within the journal-bearing clearance space is described by Reynold's equation, while the non-linear behavior of the lubricant is characterized using the Bingham model. The solution of the Reynolds equation is obtained employing the Newton-Raphson method, with numerical addressing of gaseous cavitation in the fluid film through a mass-conserving algorithm. The effects of lobe geometry and the applied electric field are scrutinized on bearing performance metrics. The equation of motion for the journal is solved utilizing the fourth-order Runge-Kutta method to predict journal center locus/trajectories. The utilization of ER lubricant in conjunction with a two-lobe journal bearing notably enhances the minimum film thickness by 63.5%, the direct stiffness parameter by 182.4%, and the damping parameter by 210.14%. The multi-lobe configuration adversely affects the frictional power loss of the bearing system. The threshold speed, a critical parameter in the design and operation of journal bearings, is improved by the ER effect and is higher for multi-lobe bearings. In multi-lobe configurations of journal bearings operating with ER lubricant, linear motion journal trajectories are noted to be smaller and more stable. Under given operating conditions, designers should prioritize two-lobe journal bearings operating with ER lubricants, as they exhibit greater stability and superior performance metrics in both steady-state and dynamic conditions.

Kuldeep Narwat

Vivek Kumar

Simran Jeet Singh

Abhishek Kumar

Rotor Dynamic Behaviour of Electro-Rheological Lubricant Operated Multi-Lobe Journal Bearings

多叶径向轴承中电流变润滑剂的转子动力学行为

短名
Journal Impact	0.98
国际分区	ENGINEERING, MECHANICAL(Q4)

ISSN	1881-218X, 1881-2198
h-index	19

涉及主题	材料科学复合材料工程类物理机械工程化学冶金有机化学热力学量子力学计算机科学生物数学地理摩擦学纳米技术化学工程
出版信息	出版商: Japanese Society of Tribologists，出版周期: ，期刊类型: journal，开源期刊: 是
基本数据	创刊年份: 2013，原创研究文献占比: 93.75%，自引率:11.10%， Gold OA占比: 99.17%
平均审稿周期	网友分享经验：23 Weeks

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Performance of EHL Oil Film in Intermittent Motion

Stress Based Model for General Rolling Contact with Surface and Subsurface Survival: Application to Gears with Material Inhomogeneities

Surface Damage Evaluation of Rolling Bearings Operating under Low Lambda Conditions

Durability of Aircraft Gas Turbine Mainshaft Ball Bearing Applying Surface and Subsurface Survival

Dry Sliding Wear Behavior of Cor-Ten Steel with Different Metallic and Ceramic Counter Bodies

Surface Damage Evaluation of Rolling Bearings Operating under Low Lambda Conditions

Durability of Aircraft Gas Turbine Mainshaft Ball Bearing Applying Surface and Subsurface Survival

Dry Sliding Wear Behavior of Cor-Ten Steel with Different Metallic and Ceramic Counter Bodies

Spalling Life Prediction for Rolling Bearings Using a Model with Stress Intensity Factor and Statistical Evaluation of Non-Metallic Inclusions

Rotor Dynamic Behaviour of Electro-Rheological Lubricant Operated Multi-Lobe Journal Bearings