Characterizations of Magnetic Field Distributions inside Buckling Pipelines
Keywords:
Buckling, detection, magnetic field, magnetomechanical effect, subsea pipelineAbstract
High internal temperature and pressure often induces the subsea pipelines to buckle and then crack. This paper exposes the magnetic field distribution characterizations inside buckling pipelines in order to detect the buckling via magnetic measurements. J-A force-magnetic coupling model is used to obtain the permeability mu r as a function of the stress sigma. Finite element method with multiphysics coupling is deployed to calculate the magnetic fields inside the buckling pipe with different magnetizations, temperatures, and pressures by importing the mu r-sigma curve. The results demonstrate that complicated stress fields cause the magnetic fields inside the buckling pipe to have many noticeable characteristics that can be deployed to reliably and precisely identify the buckling. The signs and magnitudes of the buckling stress vary significantly in different cross-sections, and even reverse at the buckling starts, where the axial and radial components have two peaks and two peak-valleypeaks symmetrically distributed about the middle plane, respectively. The magnetic fields can reveal tiny buckling with stress but without visible deformation.
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