JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 43

An aeronautics and space-oriented research group

Analysing the links between manufacturing/machining parameters and mechanical strength
When machining composite materials, the
main problem is the choice of criteria for the
qualification of machined surfaces. The current industrial criteria (for example, the average roughness Ra, Rp, etc.) do not appear
to be relevant for composites. In this context,
it is interesting to study the influence of the
microstructure (such as the presence of thermoplastic nodules between the plies) and the
conditions in which the composite is manufactured and cured on machining quality.
In particular, the surface defects and the extent of delamination during machining (drilling and milling) were analysed. In addition,
the influence of processes (drilling or trimming) on the defects and the mechanical resistance under static or fatigue conditions is
studied. New machining quality indicators,
such as the bearing surface, were proposed
and their links with the mechanical resistance were established.

Fig. 4: Example of ply thickness spatial evolution

Fig. 6: Hole roughness analysis to define drilling quality indicators

of a laminated plate's failure zones under
complex stresses (technological evaluators).
Analysis and modelling of shape defects
generated during the manufacture of
composite structures
During the manufacture of laminated composite structures, many physicochemical and
thermomechanical phenomena are at work
and can produce unwanted deformations of
the resulting parts.

A thermochemical modelling of the polymerization process was conducted to predict,
among other things, overshoots during the
polymerization of a thermoset resin for a
thick composite.
On another level, a semi-empirical thermomechanical spring-back model was developed and recently applied to a large part:
the A350 rib in the framework of CORAC
- these two studies are used to predict the
spring-back of bonded stiffeners.

Feature Aerospace

Fig. 5: A350 rib spring-back computation

Composites machining
The anisotropic and highly abrasive nature
of reinforcements, together with the heterogeneity of composite structures, makes
machining delicate. Moreover, for economic
reasons, one-shot drilling of hybrid materials (composite/aluminium, composite/
titanium, etc.) is a very complex machining
operation that damages the materials. As a
result, the ICA studies on the machining of
composite materials and multi-materials [2]
mainly focus on:
- the understanding of surface creation
mechanisms in relation to material removal processes (orthogonal cutting, drill,
bit and orbital drilling, and high-pressure
abrasive water jet cutting);
- in situ measurement of the drilling temperature by instrumentation at the core of
cutting tools using Bragg grating optical
fibres;
- the analysis of machined surfaces to improve the life of bolted structures;
- analytical and numerical modelling of the
conditions in which delamination appears
at the exit of the hole (drill and bit), taking
thermomechanical phenomena into
account;
- multiscale modelling of material removal
mechanisms and induced defects.

/ jec composites magazine

43

N°122 July 2018



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #122 - July 2018

Cover
Edito
Opinion: Bringing expertise on board
Contents
NEWS
In brief
Announcement at OC
Agenda
BUSINESS
Trends - Overview of the global carbon composites market Simulation
Market - Attractive growth opportunities for composites in the transportation market
MANUFACTURING
Fibre placement - Fibre placement on-line monitoring and solutions for quality optimisation
Fibre placement - Repurposing residual AFP tape for complex aerospace parts
Monitoring - Overcoming the complexities of RTM
Joining process - Filament winding for automated joining of lightweight profiles
Aerospace - Are thermoplastics essential to the future of composites in aeronautics?
Thermoplastic - Full out-of-autoclave thermoplastic welded airframe
Thermoplastic - Thermoplastic composites are vital to drive aerospace build rates
UAV - The Dash X unmanned aerial vehicle
Nano-satellite - Successful mission of TuPOD, a TubeSats deployer manufactured via additive manufacturing
Manufacturing - Orbital ATK and Lockheed Martin celebrate F-35 programme milestone
Light aviation - A “one shot” aircraft to revolutionize the light aviation sector
Research - An aeronautics and space-oriented research group
SOLUTIONS
Sustainability - Agricultural waste for thermal and acoustic insulation in construction
Recycling - Natural fibres and recycled rubber: new alternative solutions for composite panels
Artistic vases - Art FRP, an innovation based on the Japanese traditional sense of beauty
In the world
TECHNOLOGY
Nanotubes - Conductive glass fibre products using single-wall carbon nanotubes
Simulation - Optimizing the key manufacturing parameters of the AFP process
Index
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JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 68
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Cover
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 2
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Edito
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Opinion: Bringing expertise on board
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 5
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Contents
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 7
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - In brief
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 9
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Announcement at OC
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 11
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 12
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Agenda
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Trends - Overview of the global carbon composites market Simulation
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 15
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Market - Attractive growth opportunities for composites in the transportation market
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 17
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Fibre placement - Fibre placement on-line monitoring and solutions for quality optimisation
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 19
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 20
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Fibre placement - Repurposing residual AFP tape for complex aerospace parts
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 22
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Monitoring - Overcoming the complexities of RTM
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 24
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Joining process - Filament winding for automated joining of lightweight profiles
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 26
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Thermoplastic - Full out-of-autoclave thermoplastic welded airframe
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 28
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 29
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Thermoplastic - Thermoplastic composites are vital to drive aerospace build rates
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 31
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - UAV - The Dash X unmanned aerial vehicle
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 33
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Nano-satellite - Successful mission of TuPOD, a TubeSats deployer manufactured via additive manufacturing
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 35
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 36
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 37
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Manufacturing - Orbital ATK and Lockheed Martin celebrate F-35 programme milestone
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Light aviation - A “one shot” aircraft to revolutionize the light aviation sector
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 40
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Research - An aeronautics and space-oriented research group
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 42
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 43
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 44
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 45
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 46
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 47
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Sustainability - Agricultural waste for thermal and acoustic insulation in construction
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 49
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 50
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 51
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 52
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Recycling - Natural fibres and recycled rubber: new alternative solutions for composite panels
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 54
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 55
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Artistic vases - Art FRP, an innovation based on the Japanese traditional sense of beauty
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 57
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 58
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - In the world
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Nanotubes - Conductive glass fibre products using single-wall carbon nanotubes
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 61
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 62
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Simulation - Optimizing the key manufacturing parameters of the AFP process
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 64
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 65
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #122 - July 2018 - 67
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