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<p>The lateral stopping block, installed on both sides of the bogie frame, is used to prevent excessive lateral displacement of the car body when the train passes through curved track sections, thereby ensuring running stability and ride comfort. The main body of the lateral stopping block is made of rubber. Since rubber is susceptible to environmental effects, long-term exposure to the external environment can readily lead to aging and consequent performance degradation. In this study, exposure tests on both material specimens and components were conducted on the Tibetan Plateau. The degradation characteristics of the specimen surfaces and cross sections were examined by scanning electron microscopy. The material parameters of the rubber were obtained through tensile tests and crack growth rate tests. A life prediction method considering the variations in tearing energy and crack growth rate during rubber aging was adopted to investigate the performance evolution and service life of the lateral stopping block under the Tibetan Plateau environment. The results show that, compared with the unaged condition, the aged specimens exhibited obvious crack and void degradation features on the surface and cross section, respectively, and the crack density and pore size distribution changed with aging time. After 360&#xa0;days of aging, the specimens showed a decrease in toughness and an increase in elastic modulus, while the elongation at break decreased by 20.99% compared with that before aging. The life prediction results indicate that the service life of the lateral stopping block decreases due to the deterioration of material properties. After 360&#xa0;days of aging, the service life of the lateral stopping block was reduced by 10.05% compared with that before aging.</p>

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Study on the Degradation Characteristics of the Secondary Lateral Stopping Block of Vehicle Bogies and Their Service Life Implications Under Tibetan Plateau Conditions

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Nengneng Bao,
  • Zhuoyi Xie,
  • Yun Liang,
  • Chengqiang Wang,
  • Zhenxing He,
  • Zonglin Wu

摘要

The lateral stopping block, installed on both sides of the bogie frame, is used to prevent excessive lateral displacement of the car body when the train passes through curved track sections, thereby ensuring running stability and ride comfort. The main body of the lateral stopping block is made of rubber. Since rubber is susceptible to environmental effects, long-term exposure to the external environment can readily lead to aging and consequent performance degradation. In this study, exposure tests on both material specimens and components were conducted on the Tibetan Plateau. The degradation characteristics of the specimen surfaces and cross sections were examined by scanning electron microscopy. The material parameters of the rubber were obtained through tensile tests and crack growth rate tests. A life prediction method considering the variations in tearing energy and crack growth rate during rubber aging was adopted to investigate the performance evolution and service life of the lateral stopping block under the Tibetan Plateau environment. The results show that, compared with the unaged condition, the aged specimens exhibited obvious crack and void degradation features on the surface and cross section, respectively, and the crack density and pore size distribution changed with aging time. After 360 days of aging, the specimens showed a decrease in toughness and an increase in elastic modulus, while the elongation at break decreased by 20.99% compared with that before aging. The life prediction results indicate that the service life of the lateral stopping block decreases due to the deterioration of material properties. After 360 days of aging, the service life of the lateral stopping block was reduced by 10.05% compared with that before aging.