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<p>Clarifying the relationship between brake pad area and interfacial thermal distribution characteristics is essential for improving braking system reliability. In this study, braking friction pairs consisting of aluminum matrix composite (AMC) brake discs and circular brake pads with varying diameters (45&#xa0;mm, 60&#xa0;mm, and 65&#xa0;mm) were tested using a TM-I type reduced-scale inertial brake dynamometer under braking forces of 1.16–2.66 kN and initial braking speed (IBS) of 60–140&#xa0;km/h. Infrared thermal imaging was employed to study the effect of pad area on the braking interface temperature distribution. Results demonstrate that regardless of the brake pad employed, the high-temperature band consistently initiates within the disc radius of 135–150&#xa0;mm, while the radial temperature distribution exhibits a continuously rising, stepped, and nearly linear profile corresponding to brake pad diameters of 45&#xa0;mm, 60&#xa0;mm, and 65&#xa0;mm, respectively. The effect of pad area on the interfacial thermal distribution characteristics is governed by the synergistic effects of braking force, speed, and friction area. As the pad area increases, the high-temperature zone shrinks and the temperature gradient decreases. This is attributed to changes in pad area altering the braking force distribution, which in turn is reflected in the interfacial thermal distribution characteristics.</p>

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Thermal response characteristics of lightweight brake discs for metro vehicles: an experimental study on the effects of friction area

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Youjie Chen,
  • Jianxiang Cheng,
  • Qi Xie,
  • Huanye Chen,
  • Heran Zou,
  • Junjie Zhang,
  • Chenggang He,
  • Jihua Liu

摘要

Clarifying the relationship between brake pad area and interfacial thermal distribution characteristics is essential for improving braking system reliability. In this study, braking friction pairs consisting of aluminum matrix composite (AMC) brake discs and circular brake pads with varying diameters (45 mm, 60 mm, and 65 mm) were tested using a TM-I type reduced-scale inertial brake dynamometer under braking forces of 1.16–2.66 kN and initial braking speed (IBS) of 60–140 km/h. Infrared thermal imaging was employed to study the effect of pad area on the braking interface temperature distribution. Results demonstrate that regardless of the brake pad employed, the high-temperature band consistently initiates within the disc radius of 135–150 mm, while the radial temperature distribution exhibits a continuously rising, stepped, and nearly linear profile corresponding to brake pad diameters of 45 mm, 60 mm, and 65 mm, respectively. The effect of pad area on the interfacial thermal distribution characteristics is governed by the synergistic effects of braking force, speed, and friction area. As the pad area increases, the high-temperature zone shrinks and the temperature gradient decreases. This is attributed to changes in pad area altering the braking force distribution, which in turn is reflected in the interfacial thermal distribution characteristics.