Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes… 28 June 2022 ECCM14, Budapest 1 Determination of Inter- and Intra- Laminar GIc and GIIc in GFRP Pipes Using an Hybrid Numerical/Experimental Methodology 5th International Conference on Composites Testing and Model Identification 14-16 February 2011, Lausanne (EPFL), Switzerland Hugo Faria Marcelo F. S. F. de Moura
Determination of Inter- and Intra-Laminar G Ic and G IIc in GFRP Pipes Using an Hybrid Numerical/Experimental Methodology. Hugo Faria Marcelo F. S. F. de Moura. Porto, Portugal. Faculty of Dental Medicine. Faculty of Psychology. Faculty of Medicine. Faculty of Sport. - PowerPoint PPT Presentation
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Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 ECCM14, Budapest 1
Determination of Inter- and Intra-Laminar GIc and GIIc in GFRP Pipes Using an Hybrid Numerical/Experimental Methodology
5th International Conference on Composites Testing and Model Identification14-16 February 2011, Lausanne (EPFL), Switzerland
Hugo Faria Marcelo F. S. F. de Moura
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 2
Porto, Portugal
CompTest2011, Lausanne
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 3
Faculty of Engineering
Faculty of Sport
Faculty of Dental Medicine
Faculty of Economy
INEGI
Faculty of Medicine
Faculty of Psychology
INESC
CompTest2011, Lausanne
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 4
Overview
• Introduction
• Background
• Numerical/Experimental Methodology
• Results
• Conclusions
• Present and Future Work
CompTest2011, Lausanne
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 5
Introduction Context
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Recent projects conducted by INEGI/FEUP related to GFRP Pipes:
• (2003-2006) FCT Project – “Previsão Propriedades Longo Prazo Tubagens PRFV”• material characterization tests;• test data extrapolation methods;• numerical modelling.
• (2004-2005) MSc Thesis – “Failure Behaviour of GFRP Pipes Under Ring Deflection Loading Condition”
• (2008-2010) Real Production Tests• Monitoring and Optimization of the winding of large GFRP pipes
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 6
Introduction Objectives
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The main objectives of this work are:
• correct modelling of the “macroscopic” behaviour of GFRP Pipes up to failure under two loading cases: internal pressure and ring deflection;
• correct modelling of the damage phenomena leading to failure at the meso-scale;
• determination of the physical parameters governing the damage behaviour;
• validation of the ability to develop reallistic models for curved laminates, in view of more complex models and applications.
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 7
Background Typical Loading Cases
CompTest2011, Lausanne
Under-Soil Pipings
EN1226
EN1227
Pressurized Flow Pipings
EN1447
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Background Composite Laminates Damage Modelling
CompTest2011, Lausanne
σ = D δ
σ = ( I – E ) D δ
Cohesive Elements
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Numerical/Experimental Methodology Specimens
CompTest2011, Lausanne
Specifications of the sample pipes used in this study
parameter Internal Pressure / Ring Deflection
nominal diameter (DN) [mm] 300 / 500
nominal ring stiffness (SN) [N/m2] 5000 / 10000
nominal pressure (PN) [bar] 10 / n/a
specimens length (L) [mm] 1300 / 300
average wall thickness [mm] 6.575 / 10.450
type of reinforcement E glass-fibre
type of matrix unsaturated poliester (UP)
elastic-aparent modulus [GPa] 22.5
hoop tensle strength [MPa] 200 / 300
number of layers 5 / 12
construction typecontinuous filament winding + intermediate
deposition of glass-fibre mat
winding angle 90º (hoop)
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 10
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 12
Assumptions
CompTest2011, Lausanne
Numerical/Experimental Methodology
29kg
Assumption: pipes with 90º oriented layers can be properly modelled in 2D
52,5º
90º
3D model – 1 layer ±α
Verification: pipes with 90º oriented layers don’t present edge effects and therefore have longitudinally uniform behaviour
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 13
Assumptions
CompTest2011, Lausanne
Assumption: due to the axissymmetry of the pipe section, it can be modelled through an hal-section
Numerical/Experimental Methodology
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 14
Assumptions
CompTest2011, Lausanne
Assumption: due to the axissymmetry of the pipe section, it can be modelled through an hal-section
Numerical/Experimental Methodology
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2D Models
CompTest2011, Lausanne
Numerical/Experimental Methodology
σ = D δ
σ = ( I – E ) D δ
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2D models
CompTest2011, Lausanne
Numerical/Experimental Methodology
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 17
Results Ring Deflection
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buckling of outer plies
Progression of fibre rupture through the cross charged section
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Results Ring Deflection
CompTest2011, Lausanne
0
5
10
15
20
25
30
0 5 10 15 20 25 30 35 40
Relative Deflection [%]
Rin
g F
orc
e [k
N]
experimental
numerical GIc*/GIc=500
numerical GIc*/GIc=600
numerical GIc*/GIc=700
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 19
Results Internal Pressure
CompTest2011, Lausanne
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 20
Results Internal Pressure
CompTest2011, Lausanne
t
p
2
exp
erim
enta
l fa
ilu
re
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Results Critical Fracture Energies
CompTest2011, Lausanne
0.2 kJ/m2 < GId < 0.3 kJ/m2
0.45 < GId / GIId < 0.50
400 < GIf/GId < 600
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Conclusions
CompTest2011, Lausanne
• FEM models able to simulate quantitatively and qualitatively the behaviour of GFRP pipes up to failure under internal pressure and ring deflection loading were successfully established ;
• the slope of the “macro-curves” P-d and P-σθ is determined by the elastic-apparent modulus, E1, and the thickness, t;
• the “failure initiation” point is determined by GIf , GId e σu;
• the experimental/numerical methodology allows an easier determination of the critical values for the energy release rates of these curved laminates
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Present and Future Work
CompTest2011, Lausanne
• experimental measurement of the stress/strain state for comparison;
• generalization/validation of the methodology in other types of GFRP pipes and laminates;
• generalization/validation of the methodology for other loading cases;
• refine the study in order to reduce the range of admissibility for GIf, and GId;
Determination of Inter- and Intra-Laminar GIIc and GIIc in GRP Pipes…22 April 2023 24
Acknowledgments
• Portuguese Foundation for Science and Technology (FCT)
• Growth Programme of FP5 (EC)
• Prof. Rui M. Guedes
CompTest2011, Lausanne
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THANK YOU FOR YOUR ATTENTION
CompTest2011, Lausanne
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