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<p>With the growing demand for efficiency and low-carbon solutions in the railway freight industry, riveted–welded integrated bodies are gradually replacing traditional welded structures. Addressing the current lack of systematic fatigue testing and evaluation methods for large riveted rail freight cars, this study selected four typical riveted joints (SBJ, LJ, DBJ and CJ) and conducted comparative research involving strength testing and finite element modeling. The modeling method for these riveted structures achieves a good balance between accuracy and efficiency, with computational errors within 9.5%. A dedicated S-N curve database was established through specimen fatigue testing. Subsequent finite element analysis of the car body and high-efficiency whole-vehicle fatigue testing revealed cracks in the welded structure at the lower support beam of the center girder, while the riveted structure showed no failure. Comparative validation of calculated damage values for each structure demonstrated that the proposed whole-vehicle accelerated fatigue testing and evaluation method can effectively support design optimization and life prediction for riveted structure vehicles.</p>

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Research on Efficient Testing and Evaluation Methods for Fatigue Performance of Riveted-Welded Railway Freight Vehicles

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Maosheng He,
  • Qiang Zhang,
  • Shouguang Sun,
  • Xiaoxi Ding,
  • Shuai Wang,
  • Qiaoyan Ma

摘要

With the growing demand for efficiency and low-carbon solutions in the railway freight industry, riveted–welded integrated bodies are gradually replacing traditional welded structures. Addressing the current lack of systematic fatigue testing and evaluation methods for large riveted rail freight cars, this study selected four typical riveted joints (SBJ, LJ, DBJ and CJ) and conducted comparative research involving strength testing and finite element modeling. The modeling method for these riveted structures achieves a good balance between accuracy and efficiency, with computational errors within 9.5%. A dedicated S-N curve database was established through specimen fatigue testing. Subsequent finite element analysis of the car body and high-efficiency whole-vehicle fatigue testing revealed cracks in the welded structure at the lower support beam of the center girder, while the riveted structure showed no failure. Comparative validation of calculated damage values for each structure demonstrated that the proposed whole-vehicle accelerated fatigue testing and evaluation method can effectively support design optimization and life prediction for riveted structure vehicles.