A finite element method assessment of a Steel Tube Umbilical (STU) cable subjected to crushing load: Comparison between two and three-dimensional approaches

Guttner, William Corrêa; Santos, Caio C. P.; Pesce, Celso Pupo

doi:10.1016/j.marstruc.2017.01.002

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…This assumption is deemed to be conservative, in which only the plastic sheath and steel armour are considered. A previous study [11] demonstrated the validity of the method. The cross-section comprises three parts, i.e., an inner polypropylene (PP) sheath with a thickness of 3 mm, side wires made of 316 L Austenitic stainless steel with a diameter of 10.5 mm, and an outer PP sheath with a thickness of 2 mm.…”

Section: Umbilicalmentioning

confidence: 76%

Techno-Economic and Environmental Analysis of Decommissioned Flowline, Umbilical, and Tubular for Breakwaters

et al. 2023

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This paper presents the application of recycled tubular, flowline, and umbilical in coastal protection structures. Flowline and tubular are found to improve the load resistance capacity of concrete beams. Embedment of flowline, umbilical, and tubular into concrete beams would be beneficial to the structural performance, which do not noticeably alter the initial cracking strength of the concrete beam but will provide good post-cracking resistance. A techno-economic analysis was performed, which revealed that coastal protection concrete structures with decommissioned components accounting for more than 25% of the concrete weight could be both economically viable and environmentally friendly options. Since global warming is the most dominant environmental impact (i.e., 63%), recycling these decommissioned components from offshore structures could impose positive environmental impacts. Given the limited supply of construction materials in the remote coastal area as well as its proximity to decommissioned oil and gas rig sites, these decommissioned components could have great potential for use as construction materials in the coastal areas adjacent to the oil exploration. This preliminary study finds no showstopper for the concept of recycling the mentioned decommissioned components as coastal protection concrete structures from structural performance, environmental impact, and economic perspectives.

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Section: Umbilicalmentioning

confidence: 76%

Techno-Economic and Environmental Analysis of Decommissioned Flowline, Umbilical, and Tubular for Breakwaters

et al. 2023

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“…The eigenproblem (34) is solved for ω 2 , with k 1 given inside [−π/∆l 1 , π/∆l 1 ] and k 2 determined according to Eq. (37). The viscoelasticity of materials is neglected (η l,s = 0).…”

Section: Low-frequency Resultsmentioning

confidence: 99%

“…where p 2 is the integer such that k 2 ∈ [−π/∆l 2 , +π/∆l 2 ]. Interestingly, the expression (37) shows that the parameter n 1 can only take N 1 consecutive integer values in the first Brillouin zone, which we will denote n 1 ∈ N 1 (because the symmetry of our problem is discrete, n α has to lie inside a finite set).…”

Section: Relationship Between Propagation Constantsmentioning

confidence: 99%

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Two-dimensional elastic Bloch waves in helical periodic structures

Zhou

Treyssède

2020

International Journal of Solids and Structures

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The goal of this paper is to investigate the propagation of two-dimensional elastic Bloch waves in helical periodic structures, obeying two discrete screw symmetries about the same axis. First, a three-dimensional coordinate system is built from the two helical directions of periodicity of the problem and the radial coordinate originating from the symmetry axis. The existence of Bloch waves in bi-helical structures can be justified owing to the independence of the metric tensor of the coordinate system on both helical coordinates. Considering the elastodynamic equilibrium equations, Bloch theorem is expressed in appropriate bases to project the vector wavefields, namely the covariant/contravariant bases of the bi-helical coordinate system (or, alternatively, the cylindrical basis). From a geometrical point of view, the three-dimensional unit cell is delimited by non-plane boundaries, which must be carefully parametrized. The so-called wave finite element method is then applied to numerically solve the Bloch wave eigenproblem and the implementation of the numerical method in a bi-helical system is detailed. Owing to the cylindrical nature of the geometry, the two-dimensional propagation constants are not independent to each other. The relationship between both constants is established. The calculation of wave mode properties (wavenumbers, group and energy velocities) is performed along the helical propagation directions, as well as the straight axial and circumferential directions. Numerical validations of the overall approach are carried out for cylindrical uniform tubes and a chiral nanotube. Finally, the method is applied to a complex multi-wire structure, often encountered in energy cables, consisting of two layers of helical wires twisted in opposite directions.

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“…Compared to other types of composite pipe, MSFP has advantages in relatively cheap reinforcement material and a simpler manufacturing process, which results in low production costs. Thus, they are regarded as a popular choice for submarine pipelines transporting oil and gas [1,2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of metallic strip flexible pipes during reeling operation

Fang

Bai

2021

Marine Structures

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Metallic strip flexible pipes (MSFP), a relatively new style of unbonded flexible pipes, are considered as an attractive alternative to traditional submarine pipes. During its reeling operation, it will inevitably confront various complicated loads, which may affect the integrity and safety of MSFP's utilization. In this paper, the tension-extension and moment-curvature relation of MSFP were obtained by laboratorial tests. The mechanical properties were then imported into the global model established in ABAQUS. The finite element model was adopted to predict the deformation and mechanical responses of MSFP during the operation process. Besides, the effects of reeling length, the diameter of the coiling drum, and the pulling force were discussed. The obtained conclusions will provide some references for optimizing MSFP design and preventing possible damage in the reeling operation.

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A finite element method assessment of a Steel Tube Umbilical (STU) cable subjected to crushing load: Comparison between two and three-dimensional approaches

Cited by 15 publications

References 10 publications

Techno-Economic and Environmental Analysis of Decommissioned Flowline, Umbilical, and Tubular for Breakwaters

Techno-Economic and Environmental Analysis of Decommissioned Flowline, Umbilical, and Tubular for Breakwaters

Two-dimensional elastic Bloch waves in helical periodic structures

Mechanical behavior of metallic strip flexible pipes during reeling operation

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