Brake lining materials have always a key role in efficient and safe braking. They must be capable of good performance in different braking conditions and situations and this necessarily depends on the applied speeds and pressures. In the present work, an automotive brake lining material was characterized using microscopic observations, thermophysical measures, monotonic compression and a pin on disc friction tests with varying contact pressure and sliding speed. The microscopic characterization shows that the material was composed of numerous ingredients of various natures and shapes for complementary roles. Two mechanical responses via monotonic compression tests and thermophysical characterization realized on samples taken from brake lining material in transverse and normal directions were distinguished. This approach aims to highlight the manufacturing process's impact on the various properties of the brake lining material. Furthermore, the results of friction tests show that its sensitivity to the sliding speed is a little more important than that to the applied pressure. For increasing sliding speeds, the mean value of friction coefficient variation decreases while keeping equivalent pressures and it tends to better stabilization. When maintaining a constant speed and varying pressure, the stabilization of the mean coefficient during tests is less marked.

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Study of the Sensitivity of a Brake Lining Material to Sliding Speed and Contact Pressure

  • Mouna Baklouti,
  • Anne-Lise Cristol,
  • Yannick Desplanques,
  • Riadh Elleuch

摘要

Brake lining materials have always a key role in efficient and safe braking. They must be capable of good performance in different braking conditions and situations and this necessarily depends on the applied speeds and pressures. In the present work, an automotive brake lining material was characterized using microscopic observations, thermophysical measures, monotonic compression and a pin on disc friction tests with varying contact pressure and sliding speed. The microscopic characterization shows that the material was composed of numerous ingredients of various natures and shapes for complementary roles. Two mechanical responses via monotonic compression tests and thermophysical characterization realized on samples taken from brake lining material in transverse and normal directions were distinguished. This approach aims to highlight the manufacturing process's impact on the various properties of the brake lining material. Furthermore, the results of friction tests show that its sensitivity to the sliding speed is a little more important than that to the applied pressure. For increasing sliding speeds, the mean value of friction coefficient variation decreases while keeping equivalent pressures and it tends to better stabilization. When maintaining a constant speed and varying pressure, the stabilization of the mean coefficient during tests is less marked.