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The research investigates zinc coating fatigue in hot-dip galvanized steel under cyclic tension, suggesting implications for engineering design.
The fatigue performance of zinc coating on precracked hot-dip galvanized steel plate under cyclic tension is investigated in this research. Four hot-dip galvanized steel plate specimens considering various precrack length and steel strength were designed and tested under cyclic loading, to delve into the fatigue fracture, crack propagation, and crack morphology of the zinc coating. Numerical simulation was subsequently carried out to further study the fatigue life of the zinc coating and to pinpoint the crucial influence factors (e.g., precrack length, depth and angle) determining the fatigue life. Furthermore, the equivalent stress at the crack tip was derived on the basis of fracture mechanics theory, and then a prediction formula utilizing equivalent stress, and S–N curve was proposed to estimate the fatigue life of zinc coating. The results show that the stress intensity factor of zinc coating reaches the threshold earlier compared with that of the steel substrate, resulting in a faster crack propagation rate within the zinc coating and consequently exposing the underlying steel substrate. The zinc coating with penetration precrack displays a substantially shorter fatigue life compared with that with nonpenetration precrack, and the fatigue life of zinc coating with edge precrack is marginally lower compared with the situation of center precrack. The established formula would slightly overestimate the fatigue life by approximately 8%–13%, demonstrating its capacity to provide rough estimates of zinc coating fatigue life and offer valuable reference for engineering design.
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Huang et al. (2026) studied this question.
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