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<p>This study investigates the failure behavior of a switch made from alloy structural steel used in high-voltage transmission equipment to elucidate the underlying failure mechanism. The fracture occurred at the arc position of the hook, with the crack initiating at surface machining tool marks located in a structural stress concentration zone. Scanning electron microscopy revealed intergranular fracture features and fatigue crack propagation striations. Multiple microcracks were observed within the carburized layer on the side of the switch, propagating along grain boundaries from the material surface inward. Based on the comprehensive analysis, fatigue fracture is identified as the primary failure mechanism, with surface stress concentrations significantly accelerating crack initiation and propagation.</p>

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Fracture Failure of a Switch in the High Voltage Transmission Equipment

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Huixia Xu,
  • Long Liu,
  • Ting Jiang,
  • Na Xu,
  • Weimin Guo,
  • Linan Tian,
  • Nan Hou,
  • Xiaofeng Wu,
  • Ning Ding

摘要

This study investigates the failure behavior of a switch made from alloy structural steel used in high-voltage transmission equipment to elucidate the underlying failure mechanism. The fracture occurred at the arc position of the hook, with the crack initiating at surface machining tool marks located in a structural stress concentration zone. Scanning electron microscopy revealed intergranular fracture features and fatigue crack propagation striations. Multiple microcracks were observed within the carburized layer on the side of the switch, propagating along grain boundaries from the material surface inward. Based on the comprehensive analysis, fatigue fracture is identified as the primary failure mechanism, with surface stress concentrations significantly accelerating crack initiation and propagation.