JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 58

CFRP

Fig.4: Test sample

Fig. 5: Carbon fibre reinforced plastic (CFRP) coated with a damping elastomer

thermal energy. The material loss factor, η, is defined as follows:

Tab. 5: Summary of average damping performance

Bare
EAR
alumi0.05"
nium

EAR
1/8"

EAR
3/8"

Pyrotec
SP150
3/8"

(2)
Loss factor η = ΔW
2π W
Where: W is the energy of one vibration cycle; ΔW is the energy
absorbed by one vibration cycle.
The following relations (work [2]) between the bending rigidity of a
tough epoxy layer B and a soft spring polyester layer B1 can be varied
from one to four.
B/B1 = (fc/f1)2 x (1+ ρ/ρ1x t/t1)2
(3)
Where: B is the bending rigidity of the epoxy layer; B1 is the
bending of the rigid polyurethane layer; fc is the resonance
frequency; f1 is the frequency of free vibration; ρ is the density
of the epoxy layer; ρ1 is the density of the polyurethane layer;
t is the thickness of the epoxy layer; t1 is the thickness of the
polyurethane layer.
The resonance frequency can be predicted from equation (3) as
follows:

NeoNeoAdvent
Advent
(5"
(1/2"
insulation) insulation)

Avg. 2001000 Hz

0.003

0.028

0.100

0.293

0.224

0.066

0.044

Avg. above
1000 Hz

0.004

0.034

0.111

N/a

N/a

0.085

0.078

surfactant is a unique organic surfactant that can be used as a
replacement for silicon-based surfactants. The Dabco DMDEE
blowing agent is an amine blowing catalyst used in rigid foam sealant systems and for flexible systems. The JEFSOL EC-50 ethylene carbonate solvent is made of cyclic organic esters produced
by reaction of ethylene/propylene oxide with carbon dioxide.

Experimental samples
One of the main problems was to create amultifunctional material
with fire protection properties. A Teflon fluorocarbon liquid was
used for fire protection. Figure 2 shows a design sample for damping
and acoustic protection. A polyester layer was used on the aluminium
fuselage wrapped up with CFRP. A wood foam was designed for
multifunctional spray technology. An aluminium foil was used to
separate the wood from the CFRP and polyester layers. Fire protecting recycled crumb rubber inside a polyurethane filling is shown in
Figure 3. Polyester with rubber has fire protection properties. Figure
4 represents a model test sample consisting of a damping CFRP
(Loctite® epoxy resin) layer and a polyester acoustic layer. An
upper tough polyurethane fire block provides fire protection.

fc =

(B/B1)1/2 f1
(1+ ρ/ρ1 x t//t1)1/2

(4)

Testing a new damping treatment
A material's vibration damping performance is its ability to
absorb the imposed vibration energy and to convert it into

Fig. 6: Composite damping loss factor of various damping treatments

Tab. 6: Sound absorption coefficients at frequencies ranging from 125 to 4000 Hz [9]

1000 Hz

2000 Hz

4000 Hz

0.2

0.4

0.55

0.55

0.45

0.65

0.65

0.65

0.75

0.75

0.7

Insulation thickness, inch

125 Hz

250 Hz

300 Hz

0.5

0.04

0.1

1

0.06

0.2

2

0.15

0.4

0.75

1

0.07

0.25

0.7

0.9

0.75

0.7

2

0.25

0.7

0.9

0.85

0.75

0.75

0.5

0.05

0.15

0.35

0.5

0.6

0.6

58 jec composites magazine / No97 May - June 2015



JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015

Cover
Edito
Point of view : Excellence as a motto
Contents
COMPANY & BUSINESS
In brief
Equipment
Agenda of Events
APPLICATIONS
Marine
Watch
MARKET
USA
SPECIAL JEC AMERICAS
Conferences
Awards
Brazil, country guest of honor
Natural fibes
Manufacturing
Oil & Gas / overview
Oil & Gas / manufacturing
Oil & Gas / testing
Oil & Gas / Coating
RESEARCH & DEVELOPMENT
CFRP
Health monitoring
TECHNOLOGY & INNOVATIONS
Pultrusion
AFP
Prepreg
Repairing
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Cover
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 2
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Edito
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Point of view : Excellence as a motto
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 5
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Contents
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 7
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - In brief
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Equipment
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 10
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 11
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 13
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Ad1
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Ad2
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Marine
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 15
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Watch
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 17
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - USA
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 19
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 20
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 21
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 22
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Conferences
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 24
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 25
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Awards
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 27
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 28
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 29
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 30
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 31
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Brazil, country guest of honor
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 33
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Natural fibes
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 35
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 36
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 37
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 38
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Manufacturing
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 40
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 41
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 42
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 43
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 44
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Oil & Gas / overview
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 46
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 47
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Oil & Gas / manufacturing
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 49
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 50
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Oil & Gas / testing
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 52
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 53
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Oil & Gas / Coating
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 55
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - CFRP
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 57
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 58
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 59
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Health monitoring
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 61
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 62
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 63
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Pultrusion
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 65
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - AFP
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 67
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 68
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Prepreg
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 70
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Repairing
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 72
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Ad3
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Ad4
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - Index
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - In the world
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 75
JEC COMPOSITES MAGAZINE - Issue #97 - Special JEC Americas - May/June 2015 - 76
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