hybrid composite materials for wind turbine blades...2 october 2019, wind energy denmark, herning,...
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2 October 2019, Wind Energy Denmark, Herning, Denmark
Bo Madsen
Section of Composite Materials
Department of Wind Energy
Technical University of Denmark
Hybrid composite materials for
wind turbine blades
DTUDate Title
Hybrid composites
More than one type of reinforcement fibresin a common matrix
Fibre A Fibre B Matrix Hybrid composite
More optimal design of composite properties
to meet specific performance profile
Potential synergetic effect (so-called hybrid effect)
DTUDate Title
Glass fibre/carbon fibre hybrid composites
Carbon fibres
Glass fibres
20 m
DTUDate Title
Properties of glass and carbon fibres
Glass fibres Carbon fibres
Stiffness = 80 GPa
Strength = 3700 MPa
Density = 2.7 g/cc
Low cost
Stiffness = 200 GPa
Strength = 4700 MPa
Density = 1.8 g/cc
High cost
DTUDate Title 6
Previous projects at DTU Wind Energy
working with hybrid composites
Blade King, 2009 – 2013
LM Wind Power, Comfil, Aalborg University, DTU Wind Energy
To develop faster and more cost effective manufacturing of wind turbine blades
OptiMaDeBlade, 2015 – 2018
LM Wind Power, Fiberline, Aalborg University, DTU Wind Energy
To optimise production of wind turbine blades to lower the cost for offshore wind energy
DTUDate Title 7
In 2016, world’s largest wind turbine blade,
88 meter, 34 tonnes8 MW turbine
Hybrid composites, glass and carbon fibres
DTUDate Title
15
Hybrid fibre mixing ratio,
Composition of hybrid composites
DTUDate Title 16
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Glo
bal
vo
lum
e fr
acti
on
s
Hybrid fibre weight mixing ratio,
Carbon fibres
Glass fibres
Matrix
Experimental data and model predictions
DTUDate Title 17
0.0
0.1
0.2
0.3
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0.5
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0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Glo
bal
vo
lum
e fr
acti
on
s
Hybrid fibre weight mixing ratio,
Carbon fibres
Glass fibres
Matrix
Experimental data and model predictions
DTUDate Title 18
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Glo
bal
vo
lum
e fr
acti
on
s
Hybrid fibre weight mixing ratio,
Carbon fibres
Glass fibres
Matrix
Model curves under the assumption of constant local
fibre volume fractions in hybrid composites
Experimental data and model predictions
DTUDate Title 19
1.2
1.4
1.6
1.8
2.0
2.2
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Co
mp
oit
e d
ensi
ty [
g/cm
3]
Hybrid fibre weight mixing ratio,
Density
Performance of hybrid composites
0
20
40
60
80
100
120
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Co
mp
osi
te s
tiff
nes
s [G
Pa]
Hybrid fibre weight mixing ratio,
Stiffness
DTUDate Title 20
0
10
20
30
40
50
60
70
80
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Spec
ific
sti
ffn
ess
[GPa
/(g/
cm^3
)]
Hybrid fibre weight mixing ratio,
Stiffness per weight
15
16
17
18
19
20
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Stif
fnes
s p
er c
ost
[G
Pa/(
Euro
/kg)
]
Hybrid fibre weight mixing ratio,
Stiffness per cost
Performance of hybrid composites
DTUDate Title 24
Rule-of-mixtures model for composite strength
Brittle phase
Ductilephase
Single fracture
Multiple fracture
Envelope of stress-strain curves
DTUDate Title 25
Rule-of-mixtures model for composite strength
No hybrid effect Hybrid effect
DTUDate Title 26
Experimental data and model predictions
DTUDate Title 28
New project on hybrid composites
