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<p>Glass-fiber-reinforced polyamide 66 (GF-PA66) is widely used as a key component in high-speed railways, such as gauge blocks. However, under the influence of train loads and vibrations, GF-PA66 is prone to fretting wear, which degrades its surface quality and alters its contact state, thereby posing a potential threat to the safety of high-speed railway operations. This study systematically investigates the fretting wear behavior of GF-PA66 through fretting wear tests conducted under varying normal loads and displacement amplitudes. The worn samples were analyzed using scanning electron microscopy (SEM), confocal 3D microscopy, and energy-dispersive spectroscopy (EDS). The results revealed that transitions between fretting running regimes, including the Partial Slip Regime (PSR), Mixed Fretting Regime (MFR), and Gross Slip Regime (GSR), are jointly governed by the normal load and displacement amplitude. The maximum wear depths for PSR, MFR, and GSR were measured as 1.28&#xa0;μm, 2.26&#xa0;μm, and 8.49&#xa0;μm, respectively, while the corresponding wear volumes were 47.13 μm<sup>3</sup>, 128.48 μm<sup>3</sup>, and 353.25 μm<sup>3</sup>. In the PSR, surface deformation is primarily elastic with slight edge scratching. In the MFR, adhesive wear is dominant, accompanied by severe plastic deformation within the central adhesion zone. The GSR shows the highest wear volume and friction coefficient, where adhesive and abrasive wear are the main wear mechanisms.</p>

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Fretting Wear Behavior of Glass-Fiber-Reinforced Polyamide 66

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yong Zeng,
  • Guixiang Zhang,
  • Chao Su,
  • Xiaohua Liu,
  • Zhangyue Qin,
  • Pingdi Ren

摘要

Glass-fiber-reinforced polyamide 66 (GF-PA66) is widely used as a key component in high-speed railways, such as gauge blocks. However, under the influence of train loads and vibrations, GF-PA66 is prone to fretting wear, which degrades its surface quality and alters its contact state, thereby posing a potential threat to the safety of high-speed railway operations. This study systematically investigates the fretting wear behavior of GF-PA66 through fretting wear tests conducted under varying normal loads and displacement amplitudes. The worn samples were analyzed using scanning electron microscopy (SEM), confocal 3D microscopy, and energy-dispersive spectroscopy (EDS). The results revealed that transitions between fretting running regimes, including the Partial Slip Regime (PSR), Mixed Fretting Regime (MFR), and Gross Slip Regime (GSR), are jointly governed by the normal load and displacement amplitude. The maximum wear depths for PSR, MFR, and GSR were measured as 1.28 μm, 2.26 μm, and 8.49 μm, respectively, while the corresponding wear volumes were 47.13 μm3, 128.48 μm3, and 353.25 μm3. In the PSR, surface deformation is primarily elastic with slight edge scratching. In the MFR, adhesive wear is dominant, accompanied by severe plastic deformation within the central adhesion zone. The GSR shows the highest wear volume and friction coefficient, where adhesive and abrasive wear are the main wear mechanisms.