Scale effects in metal-forming friction and lubrication

Peter Søe Nielsen, Nikolas Aulin Paldan, Matteo Calaon, Niels Bay

Research output: Contribution to journalJournal articleResearchpeer-review


Downscaling of metal-forming operations from macro-to microscale implies significant changes caused by size effects. Among these, the friction increases as reported by researchers using indirect test methods such as the ring-compression test and double-cup-extrusion test. In this study, a new test equipment is developed for studies of the size effect in metal-forming friction in the range from macro-to microscale. Investigations confirm a significant friction increase when downscaling. Visual inspection of the workpieces shows this to be explained by the amount of open and closed lubricant pockets.
Original languageEnglish
JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Issue number9
Pages (from-to)924-931
Publication statusPublished - 2011


  • Lubrication
  • Microforming
  • Friction
  • Size effects

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