Stress intensity factor analysis of TBM cutter under spatial multi-point distributed loading
Taking a practical engineering cutterhead as an example,the static analysis of TBM cutterhead structure under typical working conditions was carried out by ANSYS Workbench,and three weak positions were obtained.Prefabricated cracks were introduced at the weak positions of the cutter,and the crack shape ratio was changed afterward,so as to get the distribution change of stress intensity factor at different positions of cracks with the change of the shape ratio.Results show that the main cracks at the positive hobbing cutter seat are open cracks and mainly expand in the depth direction,the first crack type at the side hobbing cutter seat shows negative stress intensity factor,and the last two cracks are below 6 MPa·mm1/2,indicating that crack propagation is not the main failure form at this location.This study can provide reference for the field of crack propagation and life prediction in the design process of cutterhead,which is of great significance to extend the life of cutterhead and reduce the economic loss in engineering.
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