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<p>To address the issue of fracture damage in A633D high-strength steel joints used in construction machinery under cyclic loading, we integrated infrared thermal imaging technology with microstructural and micro-/nanomechanical characterization to comprehensively investigate the temperature evolution and deformation behavior of the joints. By further coupling these experimental observations with multi-physics field simulations, we systematically analyzed the fatigue damage mechanism from microstructure to macroscopic deformation. The results show that under cyclic loading, a large number of dislocations and fragmented grains are generated at the crack tip of the joint. The nanoindentation test indicates that significant cyclic hardening characteristics are exhibited at the crack tip. The multi-physics coupling analysis of the fatigue process indicates that the central stress–strain concentration area is the preferred location for the initiation of microcracks. The research results provide a new theoretical foundation for the failure assessment of key components in construction machinery subjected to cyclic loading and offer a reference for the study of the fatigue fracture behavior of low-alloy high-strength steels.</p>

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Research on the Evolution Mechanism of Fatigue Damage in A633D Low-Alloy High-Strength Steel Joints

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Dinglu Wu,
  • Yutong Zhao,
  • Zhifeng Yan,
  • Wenxian Wang

摘要

To address the issue of fracture damage in A633D high-strength steel joints used in construction machinery under cyclic loading, we integrated infrared thermal imaging technology with microstructural and micro-/nanomechanical characterization to comprehensively investigate the temperature evolution and deformation behavior of the joints. By further coupling these experimental observations with multi-physics field simulations, we systematically analyzed the fatigue damage mechanism from microstructure to macroscopic deformation. The results show that under cyclic loading, a large number of dislocations and fragmented grains are generated at the crack tip of the joint. The nanoindentation test indicates that significant cyclic hardening characteristics are exhibited at the crack tip. The multi-physics coupling analysis of the fatigue process indicates that the central stress–strain concentration area is the preferred location for the initiation of microcracks. The research results provide a new theoretical foundation for the failure assessment of key components in construction machinery subjected to cyclic loading and offer a reference for the study of the fatigue fracture behavior of low-alloy high-strength steels.