弯曲行为文献Validity and limitation of analytical models for bending stress of a helical wire in unbonded flexible pipes.pdfVIP

Applied Ocean Research 50 (2015) 58–68 Contents lists available at ScienceDirect Applied Ocean Research journal homepage: /locate/apor Validity and limitation of analytical models for the bending stress of a helical wire in unbonded flexible pipes Minggang Tang, Chan Yang, Jun Yan ∗ , Qianjin Yue State Key Laboratory of Structural Analysis of Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, China a r t i c l e i n f o a b s t r a c t Article history: Unbonded flexible pipe is one of the important pieces of equipment in floating production systems for Received 31 May 2014 transport of oil and gas between floaters and subsea wells located in deep water. To assure safety over Received in revised form 29 October 2014 a long-term service period, analysis of fatigue behavior under alternative bending is a key requirement. Accepted 29 December 2014 An analytical model for prediction of bending behavior is essential for understanding the mechanism of the local stress distribution in the helical wires of the tension armor layers under alternative curvatures Keywords: and rapid estimation of the service life of flexible pipes for designers in engineering practice. In this Unbonded flexible pipe paper, seven analytical models available in the literature are selected and summarized. Although the Helical armor wire Bend