The process of reeling submarine pipelines involves multiple forward and reverse bending,resulting in significant plastic deformation.Prior to immersion,pipelines must undergo straightening,making it crucial to accurately predict the mechanical response of the pipeline during the straightening process and to set up the straightening device reasonably.A mechanical theoretical model based on the cantilever beam is established for the design of the straightening device of China's first reel-lay vessel,the Shenda vessel,and typical working conditions.This model comprehensively considers the loading history of unwinding and straightening during laying,the elastoplastic properties of pipeline materials,and the relative positions of the calibration device and upper and lower straighteners.The model can calculate key parameters such as the reverse bending radius and the attitude of the straightening device.A finite element analysis model is established to validate the theoretical model and conduct numerical analysis of the pipeline straightening process.The results indicate that the theoretical model can accurately predict parameters such as the required reverse bending radius,lateral travel of the straightener,and inclination during pipeline straightening.The load acting at the upper straightener during the pipeline straightening process is much greater than that at the lower straightener.The proposed straightening theoretical model is applicable to the straightening analysis of pipelines of different sizes,and the residual curvature after straightening meets the requirements of DNV standards,providing guidance for the actual straightening process design of the Shenda vessel.
reel-laypipeline straighteningplastic deformationcantilever beamsubmarine pipelinefinite element simulation
维普
万方数据
