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<p>It was shown in a previous paper that friction in highly loaded non-conforming contacts correlated with the formation of a glassy state of the lubricant, for the only lubricant studied (benzyl benzoate). The aim of the present paper is to extend this conclusion to other types of fluid: a model fluid from the literature (glycerol) and a well-known lubricant (squalane). The characterization of these fluids in the bulk by Brillouin spectroscopy shows a similar evolution of their behavior with pressure and makes it possible to identify their glass transition pressure. Furthermore, comparison of this characterization with friction data for squalane validates the correlation previously established for benzyl benzoate. In a second part, the structural relaxation time of benzyl benzoate is derived from Brillouin spectra to probe the influence of hydrostatic pressure on fluid dynamics. This parameter, superimposed on the previous friction measurements, shows that the dynamics of the molecules is highly reduced at high pressures, which explains the macroscopically solid-like behavior of the lubricant. This result suggests that the relaxation time is an essential parameter for the correct modeling of highly loaded lubricated contacts.</p>

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New Insight into the Correlation Between Lubricant Glass Transition and friction Plateau in Highly Loaded Contacts

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Marjolaine Gonon,
  • David Philippon,
  • Jérémie Margueritat,
  • Lionel Lafarge,
  • Philippe Vergne,
  • Laetitia Martinie

摘要

It was shown in a previous paper that friction in highly loaded non-conforming contacts correlated with the formation of a glassy state of the lubricant, for the only lubricant studied (benzyl benzoate). The aim of the present paper is to extend this conclusion to other types of fluid: a model fluid from the literature (glycerol) and a well-known lubricant (squalane). The characterization of these fluids in the bulk by Brillouin spectroscopy shows a similar evolution of their behavior with pressure and makes it possible to identify their glass transition pressure. Furthermore, comparison of this characterization with friction data for squalane validates the correlation previously established for benzyl benzoate. In a second part, the structural relaxation time of benzyl benzoate is derived from Brillouin spectra to probe the influence of hydrostatic pressure on fluid dynamics. This parameter, superimposed on the previous friction measurements, shows that the dynamics of the molecules is highly reduced at high pressures, which explains the macroscopically solid-like behavior of the lubricant. This result suggests that the relaxation time is an essential parameter for the correct modeling of highly loaded lubricated contacts.