Taking a bonded fiber-reinforced flexible pipe as the research object,a solid element model of the fiber-reinforced flexible pipe is established based on ABAQUS.The failure of the flexible pipe is determined according to the two-dimensional Hashin failure criterion,fully considering the plasticity of the inner and outer protective layers of the pipeline and the progressive failure of the fiber-reinforced composite material,and establishing a numerical model of the pressure collapse of the fiber-reinforced flexible pipe.The eigenvalue method is combined with the arc length method to calculate the critical collapse pressure and the corresponding external pressure-ellipticity curve of the fiber-reinforced flexible pipe more accurately.Sensitivity parameters affecting the critical collapse pressure of the flexible pipe,such as ellipticity,fiber winding angle,and straightness,are analyzed.The research results show that an increase in ellipticity and straightness deviation and a decrease in fiber winding angle will all decrease the critical collapse pressure of the flexible pipe.This result has certain reference significance for the design and use of fiber-reinforced flexible pipes.
fiber-reinforced flexible pipescollapse failureHashin failurearc length methodcritical collapse pressurewinding angleoffshore oil and gas
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