A General Approach to the Analysis of Fatigue Cracks in Lubricated Contacts

润滑接触疲劳裂纹分析的通用方法

• 批准号: EP/E034179/1
• 负责人: Daniele Dini
• 金额: $ 26.14万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE034179%2F1
• 关键词: General; Approach; Analysis; Fatigue; Cracks

In recent years there has been noticeable appreciation of the importance of failure mechanisms which affect the performance of the most critical assemblies, whose components undergo mutual contact interactions. In particular, most of the complex engineering products such as bearings, gas turbine blades/shafts, gears, railways, bolted flanges, car engines, etc. could not operate without contact and frictional interfaces. Therefore the assessment of tribological performance (i.e. how the material strength of couplings if affected by the presence lubricants, friction and wear) of these assemblies is a must for any industrial setting.Let us consider bearings as an example application. They are mechanical components used to reduce friction and provide load support for rotary or linear equipment. A single bearing failure can cause hours of downtime, including the identification and replacement of the failed component. For this reason, companies around the world have spent a vast amount of money and resources on different types of predictive maintenance technology. This suggests that fundamental research on the main phenomena responsible for such failures needs to be carried out.The proposed work will attempt to address the root causes of material failures in the presence of lubricated contacts. The role of fluid, according to some experimental observations, experience gathered from engineering practice, and the results of the theoretical analyses, is often regarded as the main contributor to catastrophic crack growth. The origin of cracks induced by the rolling/rubbing of contacting pairs will be studied and the fluid/solid interaction which is deemed as responsible for the propagation of such cracks will be investigated. Furthermore, robust experimental techniques will allow monitoring and measuring the presence of fluid within cracks generated during rolling contacts and subsequent crack growth to failure.A properly managed research programme will provide valuable feedback about how a component performs when subjected to contact loading under different working conditions. It will uncover information for improvements that prevent future failure. Rigorous root cause determination might lead to improvements that yield:(a) Greater safety(b) Improved design and reliability(c) Greater efficiency(d) Reduced maintenance(e) Reduced life-cycle costs

近年来，人们对影响最关键组件的性能的故障机制的重要性有了明显的理解，后者的组成部分经历了相互接触的相互作用。尤其是，大多数复杂的工程产品，例如轴承，燃气轮机叶片/轴，齿轮，铁路，螺栓法兰，汽车发动机等，没有接触和摩擦接口就无法运行。因此，对于任何工业环境，对摩擦学性能的评估（即，如果受到存在润滑剂，摩擦和磨损的影响）的评估（即，耦合的材料强度如何）。它们是用于减少摩擦并为旋转或线性设备提供负载支持的机械组件。单个轴承故障可能会导致停机时间的小时，包括识别和更换失败的组件。因此，世界各地的公司都在不同类型的预测维护技术上花费了大量资金和资源。这表明，需要对负责此类失败的主要现象进行基本研究。拟议的工作将试图解决在存在润滑接触的情况下造成物质失败的根本原因。根据一些实验观察，流体的作用是从工程实践中获得的经验，以及理论分析的结果，通常被视为造成灾难性裂纹生长的主要贡献者。将研究由接触对滚动/摩擦引起的裂纹的起源，并将研究被认为是导致这种裂纹传播的流体/实心相互作用。此外，强大的实验技术将允许监测和测量在滚动接触过程中产生的裂纹中的流体以及随后的裂纹增长到失败。正确管理的研究计划将提供有关组件在不同工作条件下接触负载时如何表现的有价值的反馈。它将发现改进的信息，以防止将来失败。严格的根本原因确定可能会导致产生的改进：（a）更高的安全性（b）提高设计和可靠性（c）效率更高（d）降低维护（e）降低了生命周期成本

项目成果

Fluid film lubrication in the presence of cavitation: a mass-conserving two-dimensional formulation for compressible, piezoviscous and non-Newtonian fluids

• DOI: 10.1016/j.triboint.2013.05.018
• 发表时间: 2013-11-01
• 期刊: TRIBOLOGY INTERNATIONAL
• 影响因子: 6.2
• 作者: Bertocchi, Luca;Dini, Daniele;Baldini, Andrea
• 通讯作者: Baldini, Andrea

A Mass-Conserving Complementarity Formulation to Study Lubricant Films in the Presence of Cavitation

• DOI: 10.1115/1.4002215
• 发表时间: 2010-10
• 期刊: Journal of Tribology-transactions of The Asme
• 影响因子: 2.5
• 作者: M. Giacopini;M. Fowell;D. Dini;A. Strozzi

Formulation of the tangential velocity slip problem in terms of variational inequalities

用变分不等式表述切向速度滑移问题

• DOI: 10.1177/1350650114530680
• 发表时间: 2014
• 期刊: Journal of Engineering Tribology
• 作者: Strozzi A

Analysis of the Lubrication Regimes at the Small End and Big End of a Connecting Rod of a High Performance Motorbike Engine

高性能摩托车发动机连杆小端和大端润滑状况分析

• DOI: 10.1115/ijtc2012-61087
• 发表时间: 2012
• 作者: Bertocchi L

A Mass-Conserving Complementarity Formulation to Study Fluid Film Lubrication in the Presence of Cavitation for Non-Newtonian and Compressible Fluids

用于研究非牛顿和可压缩流体存在空化情况下的液膜润滑的质量守恒互补公式

• DOI: 10.1115/esda2012-82885
• 发表时间: 2012
• 作者: Bertocchi L