Determination of friction factor by ring compression testing and FE analysis

Michal Zbigniew Gzyl, Andrzej Rosochowski, Muhammad Jawad Qarni, Lech Olejnik

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Abstract

The goal of this study was to examine performance of various lubricants for aluminium alloy AA5083. Conventional ring compression tests were conducted at 200 °C. Samples were compressed to 50% of the initial height with a constant ram velocity 0.5 mm/s using a servo-controlled hydraulic press. The optimization procedure was implemented in self-developed software to identify friction factors from experiments. The application launches remotely finite element (FE) simulations of ring compression with a changing friction factor until a difference between experiment and numerical prediction of the internal diameter of the sample is smaller than 0.5%. FE simulations were run using Forge3 commercial software. The obtained friction factor quantitatively describes performance of a lubricant and can be used as an input parameter in FE simulation of other processes. It was shown that application of calcium aluminate conversion coating as pre-lubrication surface treatment reduced friction factor from 0.28 to 0.18 for MoS2 paste. It was also revealed that commercially available graphite-based lubricant with an addition of calcium fluoride applied on conversion coating of calcium aluminate had even lower friction factor of 0.11
Original languageEnglish
Pages (from-to)156-161
Number of pages6
JournalComputer Methods in Materials Science
Volume15
Issue number1
Publication statusPublished - Jan 2015
EventKomplastech 2015 - Computer methods in Materials Technology - Krynica Zdroj, Poland
Duration: 11 Jan 201514 Jan 2015

Keywords

  • ring compression testing
  • friction factor
  • lubrication monitoring

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