Abstract
There is a serious fatigue failure of TBM cutterhead in service. Because of its extreme service environment and complex structure, it is difficult to predict its fatigue life. For the issue, a crack propagation rate model suitable for TBM cutterhead was established, based on its previous failure data and considering the relevant factors that affect its crack propagation. Its main failure mode was determined by collecting the data of its crack failure to analysis the surface morphology and fracture. Bases on fracture mechanics, combined with the failure mode of crack, the general mechanism of crack propagation and structural characteristics of TBM cutterhead, its crack propagation rate model during full stage was established. The relevant parameters of the model was determined by fatigue tensile test, and it was verified by experiments. The results show that the crack propagation rate model proposed in this paper can effectively predict the crack propagation process of TBM cutterhead and provide the theoretical basis for the prediction of TBM cutterhead fatigue.
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