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Research Papers

Homogenization and Stress Analysis of Multilayered Composite Offshore Production Risers

[+] Author and Article Information
V. B. C. Tan

e-mail: mpetanbc@nus.edu.sg

T. E. Tay

Department of Mechanical Engineering,
National University of Singapore,
9 Engineering Drive 1,
Singapore 117576

1Corresponding author.

Manuscript received January 9, 2013; final manuscript received May 15, 2013; published online September 18, 2013. Assoc. Editor: Anthony Waas.

J. Appl. Mech 81(3), 031003 (Sep 18, 2013) (12 pages) Paper No: JAM-13-1013; doi: 10.1115/1.4024695 History: Received January 09, 2013; Accepted May 15, 2013; Revised May 15, 2013

An approach for stress analysis of multilayered composite cylinders is proposed for the analysis of new composite risers used in deep-water oil production of offshore petroleum industries. Risers essentially comprise long cylindrical sections connected end-to-end. In the formulation, only stresses and strains that are continuous through the thickness of the multilayered composite risers are taken to be equal to reported solutions for homogenous orthotropic hollow cylinders using homogenized material properties. These stress and strain solutions are then used to calculate the remaining discontinuous stresses and strains from the material properties of individual layers of materials. The homogenized elastic constants of cylindrically orthotropic composite risers are derived from force-deformation equivalence, taking into account the stress and strain distributions in each layer. Four typical loading conditions are considered in the stress analysis, namely, internal and external pressures, axial loading, bending, and torsion. Examples of homogenized elastic constants and stress analyses of composite cylindrical structures with different layups and materials are presented to demonstrate the application of the proposed method. The results compared very favorably with those from other solutions. This method provides practical benefits for the design and analysis of composite risers. Because there is no requirement to explicitly enforce interfacial continuity in this method, stress analyses of composite cylinders with many layers of different fiber angles or materials can be carried out efficiently. The homogenized elastic constants can greatly expedite the analysis of entire composite riser systems by replacing complex models of riser sections with homogenized riser sections.

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Figures

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Fig. 1

Geometrical model of a composite riser: (a) basic geometrical parameters, (b) fiber angle in a composite layer, and (c) layer sequence and parameters

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Fig. 2

Two typical sections of the composite cylindrical structure: (a) cross section and (b) longitudinal section

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Fig. 4

Uniform internal and external pressures

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Fig. 5

Torsion and shear loads: (a) torsion, (b) axial shear, and (c) hoop shear

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Fig. 6

Stress distributions for layup type A

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Fig. 7

Stress distributions for layup type B

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Fig. 8

Stress distributions for layup type C

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Fig. 9

Radial stress distributions

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Fig. 10

Strain distributions: (a) radial strain, (b) hoop strain, (c) axial strain, and (d) shear strain

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Fig. 11

Stress distributions of the composite tube under bending moment

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Fig. 12

Stress distributions under external pressure

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Fig. 13

Stress distributions under axial force

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Fig. 14

Stress distributions under bending moment

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Fig. 15

Stress distributions under torsion

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