Professor Pwt Evans
Professor Pwt Evans leads the tribology and contact mechanics research group at the Cardiff School of Engineering. He received his higher education at the University of Exeter, from which he holds BSc, PhD and DSc degrees. He is a chartered engineer and a Fellow of both the Institution of Mechanical Engineers and the Learned Society of Wales; he was awarded the Tribology Trust Silver medal in 2009. He has researched in the field of elastohydrodynamic lubrication since his post-doctorate research, where he produced the first point contact EHL solutions at realistic engineering loads. He has worked on a range of projects with many companies - mainly in the EHL field - and has published some 150 technical papers in this area. His main interests are in mixed lubrication and micropitting in gears, but he also has interests in plain bearings and in self-lubricating, composite liner bearings. (Bio last updated 2016-08-01 Contact Randy Stott, Managing Editor, with changes.)
Articles by Pwt Evans
- Transient EHL Analysis of Helical Gears (August 2016)
This paper addresses the lubrication of helical gears - especially those factors influencing lubricant film thickness and pressure. Contact between gear teeth is protected by the elastohydrodynamic lubrication (EHL) mechanism that occurs between nonconforming contact when pressure is high enough to cause large increases in lubricant viscosity due to the pressure-viscosity effect, and changes of component shape due to elastic deflection. Acting together, these effects lead to oil films that are stiff enough to separate the contacting surfaces and thus prevent significant metal-to-metal contact occurring in a well-designed gear pair.