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Research at the Ocean Structure´s Nucleus

China- Brazil Forum for Subsea Technology

Murilo A. Vaz Rio de Janeiro 18 May 2016

Research at the Ocean Structure´s Nucleus

Ocean Structure’s Nucleus (Laboratory )

Coordination: Prof. Murilo A. Vaz

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Mission: To develop tests, analytical and numerical models for design and structural analysis of ocean structures: flexible risers, pipelines, umbilical cables, ship panels, drilling systems and ocean structures.

RESEARCH AREAS: Structural Mechanics

• Flexible Pipes and umbilical cables
• Bend stiffeners and end fittings
• Pipelines, risers and marine cables

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• Drilling systems
• Ship panels
• Structure Integrity
• ≈ 30 undergraduate & graduate students

Horizontal Rig

Tension: 100 ton. Bending: 40 ton.m. Angles: ± 15°. Sample: 9 m. Variable frequency.

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“Non-conventional” Tests

Vertical Rig

Tension: 225 ton . Bending: 200 ton.m. Angles: -15 +30°. Sample: 12 m. Variable frequency.

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Dynamic Bending-Compression Test

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Laboratory infrastructure to perform lateral instability tests

New Horizontal Rig

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• Tension: 500 tonf.
• Bending: 200 tonf.m.

Universal Test Frame

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Load capacity: 2500 kN.

Flexible Pipes and Umbilical Cables

• Non-linear axi-symmetric analysis.
• Numerical simulation (ABAQUS) and analytical modelling of

lateral and radial (birdcage) instability of armour wires.

• Axi-symmetric viscoelastic analysis (axial damping).
• Fatigue analysis methodology.

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• Integrity of thermoplastic materials.

Bend Stiffeners

• Non-linear analysis (analytical and FE modelling).

Hyper-elastic asymmetric, non-linear viscoelastic material. Thermo-viscoelasticity: self-heating

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Pipelines and marine cables

• Thermo-mechanical buckling.

Buckling initiation: sleepers and buoy modules.

• Pipe-in-Pipe buckling.

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• Marine cable mechanics.

Drilling systems

• Dynamic analysis of vertical risers.
• Underbalanced drilling: concentric casing and riser.
• Fall of marine risers.
• Static coupled analysis of riser-drill string: contact and wear.
• Buckling and vibration of drill strings.

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Analise Dinamica de Queda - 1000m - 9 ppg

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• 100
• 80
• 60
• 40
• 20

20 40 60 80 100

Desvio para o Norte (m)

• 300
• 200
• 100

100 200 300

Desvio para o Leste (m)

Offset

1 % 2 % 3 % 4 % 5 % 6 %

• Buckling of corroded ship panels.
• Structure behaviour in fire.
• Ship collision and grounding.

Ship Structures

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• Ship collision and grounding.
• Thermomechanical analysis of welded plates.
• In-line heating.

THANK YOU!

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murilo@oceanica.ufrj.br www.oceanica.ufrj.br