JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 56

automotive

Fig. 4: Flax tape reinforcement specimens

(E/ρ) for each weight per unit area.
In order to define the best test sample
size for good repeatability of this
modulus, different sample widths and
lengths were investigated (Figure 4).
The specific modulus value (E/ρ) is
related to the flax tape density, which
reflects not only the physical characteristics but also the quality of the
tape. Quality is conditioned by several
factors (fibre dispersion, fibre and
water content, fibre origin and storage
conditions) that strongly influence
the repeatability of the measurement.
The specific modulus (E/ρ) can be
obtained with the following formula:

E/ρ= k L²/m
where E is the tensile
modulus and k the
slope of the loaddisplacement curve.
L, m and ρ are the
initial length, mass
and density of the
sample, respectively.
Finally, the 25mm x
200mm specimen is
the optimal representative element Fig. 7: Correlation between wedge thickness and resin weight fraction
of the flax tape to
check its quality and interpret the betechniques such as spraying (exhaviour of the derived bio-composite
pected for industrial production) and
(Figure 5).
roll coating (used for prototyping)
(Figure 6). Four parameters were investigated: impregnation over one or
Unidirectional Flax/Acrodur ®
both sides, variation of resin concencomposites
tration, resin weight in the prepreg
and drying cycle. A wetting agent is
Preparation and characterization of
commonly applied on the flax tape
composite samples
to modify its surface tension and
Unidirectional (UD) prepregs were
enhance its impregnability before
prepared using the compression
adding the resin. The moisture conmoulding process (3 min, 200 bars,
tent of the prepregs plays a key role.
190°C), with two impregnation
Due to the high curing temperature,
vapour is released and may create
blisters and voids in the final composite. An optimal fibre/resin ratio
and process (wedge) were identified
to avoid blisters and thus control the
quality of the laminates in terms of
density, visual aspect and mechanical
Fig. 6: Compression moulding process
properties (Figure 7). Tensile tests
were carried out on laminate samples
following the ISO 527 standard.
The experimental setup used an
Instron 33R 4204 testing machine
equipped with a 50kN load cell and
coupled to a stereovision apparatus
for the experimental kinematics fullfield measurements (Figure 8).

Fig. 5: Specific modulus of flax tape. Each point of the graph is the average of 20 samples; the 25mm x 200mm
sample shows good repeatability

56 jec composites magazine / No89 May 2014

Fig. 8: ARAMIS system



JEC COMPOSITES MAGAZINE - Issue #89 - May 2014

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #89 - May 2014

Cover
Edito
Point of view: volume production
Contents
COMPANY & BUSINESS In Brief
MEA
Agenda of Events
APPLICATIONS
Race car
E-helicopter
Pipes
Consumer goods
MARKET
Brazil
U.S.
WPC
FEATURE AERONAUTICS
Integration
CMC
Prepregs
CAE
Design
Equipment
Structure
Interview
RESEARCH & DEVELOPMENT
Infusion
Process
TECHNOLOGY & INNOVATIONS
Automotive
Tow placement
Core materials
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Cover
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 2
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Edito
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Point of view: volume production
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 5
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Contents
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 7
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - MEA
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 11
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Ad1
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Ad2
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Race car
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 13
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 14
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - E-helicopter
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Pipes
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 17
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Consumer goods
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 19
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Brazil
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 21
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - U.S.
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - WPC
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 24
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 25
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 26
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Integration
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 28
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - CMC
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 30
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 31
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Prepregs
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 33
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 34
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - CAE
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 36
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Design
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 38
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 39
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Equipment
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 41
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Structure
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 43
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Interview
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 45
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 46
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Infusion
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 48
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 49
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 50
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Process
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 52
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 53
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Automotive
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 55
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 56
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 57
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 58
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 59
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Tow placement
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 61
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 62
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Core materials
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 64
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - Index
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - In the world
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 67
JEC COMPOSITES MAGAZINE - Issue #89 - May 2014 - 68
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