弯曲行为文献calcultaion of stresses and slip in strctural layers of unbonded flexible pipes.pdfVIP

Calculation of Stresses and Slip in Structural Layers of J . J . Feret Unbonded Flexible Pipes C. L. Bournazel This paper deals with the behavior of high-pressure unbonded flexible steel pipes which can be used as risers in offshore applications. It concerns primarily the Institut Franfais du Petrole, behavior of the internal structure of the pipe. A theoretical approach allows to Rueil-Malmaison, France establish simple formulas for evaluating: the stresses, and the contact pressures between layers due to axisymmetrical loads; the stresses due to bending; the relative slip between layers due to bending. This is a first step towards the evaluation of the life expectancy of flexible pipes. It must be completed by the determination of friction and wear factors through test results. Introduction « A short review of the bases and of the outputs of the presently available programs analyzing the global behavior Large-diameter flexible hoses have been