4.7 Article

Effect of the steel fiber length on the friction performance and wear mechanism of railway brake shoes

Journal

TRIBOLOGY INTERNATIONAL
Volume 172, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2022.107589

Keywords

Steel fibers; Friction materials; Wear mechanism; Railway brake shoes; Full-scale dynamometer

Funding

  1. Quality Assurance Laboratory
  2. R&D Department at Knorr-Bremse Pamplona

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This study characterizes the effect of steel fiber length on the friction performance and wear mechanism of brake shoes. The results show that a higher content of fibers shorter than 0.125 mm improves friction stability, reduces friction coefficient, and wear rate. Regardless of fiber length, the wear mechanism remains the same. However, shorter steel fibers detaching less frequently from the brake surface lead to significant differences in friction and wear. Furthermore, material transference from the wheel to the brake block is confirmed.
The effect of the steel fiber length on the friction performance and wear mechanism of brake shoes is characterized. Friction tests were run on a full-scale railway dynamometer, and the tested surfaces were studied by optical microscopy and SEM. It was found that a higher content of fibers shorter than 0.125 mm increases the friction stability through changing conditions, and it also decreases the friction coefficient and the wear rate. The wear mechanism was found to be the same regardless of the fiber length. However, shorter steel fibers detaching from the brake surface less frequently led to significant differences in friction and wear. Finally, the transference of material from the wheel onto the brake block was evidenced.

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