Modelling the structural response of fibre-reinforced composites subjected to fire Renaud Gutkin, Hans Olsen, Per Blomqvist
[email protected]
ECCM 16, Sevilla, 25th June 2014
Motivations
Fire Simulation Workflow Fire dynamic smulation
Heat Transfer
Mechanical response
FILM
© SP
© Swerea
Outline
The materials Thermal analysis Validation thermal model Mechanical analysis Validation mechanical model Conclusions
The materials
FIRE RESIST materials Long fibre Non crimp fabrics
Carbon fibre
Short fibres
Glass fibre
phenolic epoxy PA6 resin Furane
So modelling at which scale? Constituents
Ply
Laminate
Outline
The materials Thermal analysis Validation thermal model Mechanical analysis Validation mechanical model Conclusions
Thermal analysis
Heat Transfer
Heat generated during pyrolysis
Henderson & Wiecek (1987)
So modelling at which scale? Constituents
Ply
Laminate
Heat Transfer: properties
Mass loss Conductivity Heat capacity Density
Henderson & Wiecek (1987)
So modelling at which scale? Constituents
Ply
Laminate
Heat transfer equation with micromechanics
Density Heat capacity Conductivity Mass loss
;
Heat transfer equation: effect of degradation and temperature Residual Resin Content
Can be applied to fibres too
Resin conductivity Resin specific heat
Both can be temperature dependent if measured
Outline
The materials Thermal analysis Validation thermal model Mechanical analysis Validation mechanical model Conclusions
Validation thermal model
Finite element model Case 1: short fibres + furane Modelling at ply level 4 mm thick laminate
280 mm
Convection and radiation @ 25˚C
Case 2: long fibres + PA6 Modelling at constituents level 9 mm thick laminate
FDS input
Results thermal analysis Temperature
Furane + short glass fibres
Resin residual content
Results thermal analysis
Furane + short glass fibres
Results thermal analysis
Comfil-G
Outline
The materials Thermal analysis Validation thermal model Mechanical analysis Validation mechanical model Conclusions
Mechanical analysis
Mechanical analysis
with
Mechanical analysis
and
Mechanical analysis : effect of degradation and temperature
Gibson et al. (2012)
Outline
Thermal analysis Validation thermal model Mechanical analysis Validation mechanical model Conclusions
Validation mechanical model
Finite element model Case 1: short fibres + furane Modelling at ply level 4 mm thick laminate
Case 2: long fibres + PA6
280 mm 12.8 kg Dead weight
Modelling at constituents level 9 mm thick laminate
Supports
Results mechanical analysis
Furane + short glass fibres
Results mechanical analysis
Comfil-G
Conclusions
• Versatile model developed • Adapted to structural calculation • Further developments to account for viscous and creep effects • Further validation on middle scale structures and on CFRP
Acknowledgements
• • • •
FP7 program Antti Paajanen Erik Marklund Spyros Tsampas
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