The hydraulic excavator track link was selected as the research object. A comprehensive methodology for predicting track link fatigue life, based on integrated dynamics-FEA-fatigue criterion analysis, was proposed. Initially, a dynamic model of the hydraulic excavator track link was constructed and validated by contrasting key parameter data obtained from experiments and simulations. Subsequently, the extracted dynamic loads,including track tension and contact forces derived from the dynamic model,were imported into finite element analysis software. Stress and strain solutions were numerically computed at all nodal points within the track link mesh. Finally, addressing the characteristic multi-mode, alternating, asymmetric loading of the track link, structural life prediction was implemented based on a multiaxial fatigue criterion. The results demonstrate that the mean error between critical parameter data from the established simulation model and experimental data was maintained within 10%. Fatigue life predictions were obtained for the track link under both straight-line travel and steering conditions of the hydraulic excavator. The predicted life exceeded 107 cycles under straight-line travel, while a life of 3.59×106 cycles was predicted for the steering condition.
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