Friction: The Tribology Enigma

摩擦：摩擦学之谜

• 批准号: EP/R001766/1
• 负责人: Anne Neville
• 金额: $ 724.9万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FR001766%2F1
• 关键词: Friction; Tribology; Enigma

Friction plays a central role in life; in transport, in manufacturing, in process engineering, in medical devices and in everyday human activities. Friction has commanded the attention of Amontons, Coulomb and Da Vinci and their simplistic, empirical laws have been the cornerstone of friction theory. At the conceptual and theoretical levels the vast modern day friction literature has revealed the enormous complexity of even the simplest processes and the limitations of the early friction laws. Friction is intimately linked to both adhesion, contact geometry and wear and all require an appreciation of the highly non-equilibrium and non-linear processes occurring over multiple length scales. The challenge presented is that friction in realistic engineering contacts cannot be predicted. Understanding the physical and chemical processes at contacting interfaces is the only route to cracking the tribological enigma. The research gap addressed in this Programme Grant is linked to the development of accurate experimental and numerical simulations of friction. We appreciate that the search for a unified model for friction prediction is futile because friction is system dependent. However, the goal to predict friction is achievable. We have identified 4 key areas where there are current challenges in understanding the origins of friction because of different complexities as outlined below:- Reactive surfaces; in many systems the frictional contact brings about chemical reactions that can only be described by non-equilibrium thermodynamics. We need accurate kinetic rate data for reactions which can only be provided by advanced in-situ chemical analysis- Extreme interfaces; these can be described as any interfaces that are inducing high strain rate material deformation and combined with electrochemical or chemical reactions. Simulation and sensing are key to improving the understanding. - Non-linear materials; in engineering and in biological systems we see the evolution of "soft" materials for tribological applications. Predicting friction in these systems relies on understanding the rheology/tribology interactions. - Particles and 2nd phase materials; for materials processing or for understanding the transport of wear particles in a contact we need to understand particle-particle friction in complex contact conditions where fracture/deformation are occurring.

摩擦在生活中扮演着中心角色；在运输、制造、加工工程、医疗设备和日常人类活动中。摩擦力引起了阿蒙顿、库仑和达·芬奇的注意，他们的简单的经验法则已经成为摩擦力理论的基石。在概念和理论层面上，大量的现代摩擦文献揭示了即使是最简单的过程的巨大复杂性和早期摩擦定律的局限性。摩擦与粘附、接触几何形状和磨损密切相关，并且都需要对发生在多个长度尺度上的高度非平衡和非线性过程进行评估。提出的挑战是，现实工程接触中的摩擦是无法预测的。了解接触界面的物理和化学过程是破解摩擦学谜题的唯一途径。该计划补助金所解决的研究差距与精确的摩擦实验和数值模拟的发展有关。我们认识到，寻找摩擦预测的统一模型是徒劳的，因为摩擦依赖于系统。然而，预测摩擦的目标是可以实现的。由于不同的复杂性，我们已经确定了目前在理解摩擦起源方面存在挑战的4个关键领域，如下所述：-活性表面；在许多系统中，摩擦接触引起的化学反应只能用非平衡态热力学来描述。我们需要精确的反应动力学速率数据，这些数据只能通过先进的原位化学分析来提供。这些可以被描述为引起高应变率材料变形并与电化学或化学反应相结合的任何界面。模拟和感知是提高理解的关键。-非线性材料；在工程和生物系统中，我们看到了用于摩擦学应用的“软”材料的发展。预测这些系统中的摩擦依赖于对流变学/摩擦学相互作用的理解。-颗粒和第二相材料；对于材料加工或了解接触中磨损颗粒的传输，我们需要了解发生断裂/变形的复杂接触条件下的颗粒-颗粒摩擦。

项目成果

Modelling tribochemistry in the mixed lubrication regime

• DOI: 10.1016/j.triboint.2018.12.024
• 发表时间: 2019-04
• 期刊: Tribology International
• 影响因子: 6.2
• 作者: Abdullah Azam;A. Ghanbarzadeh;A. Neville;A. Morina;M. Wilson

In situ nanocompression of carbon black to understand the tribology of contaminated diesel engine oils

• DOI: 10.1016/j.carbon.2023.118170
• 发表时间: 2023-06
• 期刊: Carbon
• 影响因子: 10.9
• 作者: A. Al Sheikh Omar;F. Salehi;M. Bai;B. Inkson;A. Morina

Effect of Zinc Dialkyl Dithiophosphate Replenishment on Tribological Performance of Heavy-Duty Diesel Engine Oil.

• DOI: 10.1007/s11249-022-01565-8
• 发表时间: 2022
• 期刊: Tribology letters
• 影响因子: 3.2
• 作者: Al Sheikh Omar A;Salehi FM;Farooq U;Neville A;Morina A
• 通讯作者: Morina A

A simple deterministic plastoelastohydrodynamic lubrication (PEHL) model in mixed lubrication

• DOI: 10.1016/j.triboint.2018.11.011
• 发表时间: 2019-03-01
• 期刊: TRIBOLOGY INTERNATIONAL
• 影响因子: 6.2
• 作者: Azam, Abdullah;Dorgham, Abdel;Wilson, Mark C. T.
• 通讯作者: Wilson, Mark C. T.

Measuring tappet rotation in a valvetrain rig when lubricated in a fully formulated oil containing MoDTC-type friction modifier

• DOI: 10.1016/j.triboint.2018.01.061
• 发表时间: 2018-05-01
• 期刊: TRIBOLOGY INTERNATIONAL
• 影响因子: 6.2
• 作者: Al-Jeboori, Yasir;Kosarieh, Shahriar;Neville, Anne
• 通讯作者: Neville, Anne