JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 59

Inside the lab

Advanced Composite Materials Facility University of Southampton
Resin

Development of new type of plastics: Polypropylene 2.0

59
62
64

TECHNOLOGY

Repair

Developing an eddy current-based sensor system
for quality assurance of carbon fibres

repair TECHNOLOGY

Developing an eddy current-based sensor
system for quality assurance of carbon fibres
Lukas Lechthaler, Researcher
Institut für Textiltechnik of RWTH Aachen University
Thomas Gries, Director
Institut für Textiltechnik of RWTH Aachen University
Richard Kupke, Director Product Management,
Suragus GmbH
Dirk Feltin, CEO
Hightex Verstärkungsstrukturen GmbH,
Peter Vojcena, System development NCF Inspection,
Saertex GmbH & Co. KG
Christine Stamm, Manager Technical Service,
Teijin Europe GmbH

Carbon fibre-reinforced plastics are becoming increasingly important
in various fields of application. While certified quality assurance systems with corresponding test procedures already exist for metallic
materials, testing and quality assurance of the CFRP process chain
are still in the development stage. Therefore, the objective of the ZIM
EddySCARF project is to develop an eddy current measuring system
that can be used by carbon fibre manufacturers and processors.

T

he aim of the ZIM EddySCARF research project is to develop an eddy current sensor that allows inline, non-contact 100% inspection of carbon fibre rovings for quality assurance. The sensor is useful to both carbon fibre manufacturers
for outgoing goods inspection and yarn processors for incoming
goods inspection and production process monitoring. The eddy
current sensor is designed to detect, classify and quantify various
defects in carbon fibre processing (e.g. gaps, fuzz, undulations,
false twists, accumulated or significant filament breaks).
The measurement signal is evaluated both by classical measurement value analysis and by machine learning algorithms using
neural networks. The development focuses on the detection of optically invisible defects and their influence on mechanical performance. The economic use of the sensor by scaling is of secondary
interest.

Challenges
Carbon fibre-reinforced plastics (CFRP) are becoming increasingly important in various fields of application. The largest areas of
application are the aerospace and automotive industries, with the
wind energy and sports & leisure sectors also recording growth [1].

Quality assurance has already been certified for metallic materials
and corresponding test procedures exist. In contrast, both testing
and quality assurance of the CFRP process chain are still under development. The quality assurance of carbon fibre (CF) rovings is
the sole focus of this project. When a damaged roving is removed
early from the CFRP process, no added value is wasted as it is not
processed into a component. This way, a suitable test procedure
can contribute to increased economic efficiency and resource conservation of the energy- and cost-intensive carbon material.
So far, the quality assurance of carbon fibre rovings has been handled offline by means of outgoing and incoming goods inspections
using destructive testing. These tests are time consuming and can
only be carried out in the form of sampling. Therefore, a carbon fibre bobbin cannot be 100% tested, which results in an uncertainty
regarding the quality of the goods. To conduct a 100% inspection,
non-destructive testing methods can be used, whereby mostly
optical sensors are used. A disadvantage of optical sensor systems
is that quality assurance can only be performed on the surface of
the roving. However, in a 12k roving (Figure 1), only about 1,900
filaments are on the surface while the roving consists of a total of
12,000 filaments [2,3].
Figure 1 shows that optical sensors can only inspect about 16% of
the roving. Therefore, the defects inside the roving are not detected and remain in the process chain, where they can ultimately lead

N°136 September - October 2020

/ jec composites magazine

59



JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020

Cover
Edito
“We can change the way we envision global shipping overall”
Contents
NEWS
In brief
Agenda
BUSINESS
Reinforcement - Natural-fibre composites: an overview
Startup - When 3D printing meets sustainability
China - Xinzhou bets on the bamboo-based composites industry
MANUFACTURING
Wind - lnnovation in wind power through multi-process-capable systems
Automation - Higher production capacity thanks to automated manufacturing
FEATURE Sustainability - The path has been plotted
Recycling ecosystem - Composites recycling: in search of the circular economy
Mobility - A new generation of recycled composite materials for sustainable mobility
Preimpregnated textile - Healable composites to improve circularity
Process - New trends in composites and plastics recycling
Raw materials - Innovative composites made from up to 92% reclaimed materials
Construction - Biocomposites and automation: a sustainable future for the building industry
Ressources - Waste-free composite wheel production
Wind energy - From bottle to blade
Durable composites - Upcycling plastic bottles into value-added composite applications
Matrix - Novel thermoset composites for more competitive and sustainable industries
SOLUTIONS
Aerospace - Slinging rockets into space
Aerospace - Composites push back the final frontier
Railway - Composite overhead line catenary system for light rail
TECHNOLOGY
Repair - Developing an eddy current-based sensor system for quality assurance of carbon fibres
Inside the lab - Advanced Composite Materials Facility University of Southampton
Resin - Development of new type of plastics: Polypropylene 2.0
Index
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JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Cover
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 2
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Edito
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - “We can change the way we envision global shipping overall”
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 5
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Contents
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 7
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - In brief
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 9
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 10
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Agenda
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Reinforcement - Natural-fibre composites: an overview
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 13
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Startup - When 3D printing meets sustainability
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 15
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - China - Xinzhou bets on the bamboo-based composites industry
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 17
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Wind - lnnovation in wind power through multi-process-capable systems
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 19
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 20
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 21
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Automation - Higher production capacity thanks to automated manufacturing
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 23
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 24
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 25
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Recycling ecosystem - Composites recycling: in search of the circular economy
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 27
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 28
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 29
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 30
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Mobility - A new generation of recycled composite materials for sustainable mobility
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 32
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Preimpregnated textile - Healable composites to improve circularity
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 34
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 35
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Process - New trends in composites and plastics recycling
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 37
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Raw materials - Innovative composites made from up to 92% reclaimed materials
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 39
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Construction - Biocomposites and automation: a sustainable future for the building industry
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 41
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Ressources - Waste-free composite wheel production
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 43
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Wind energy - From bottle to blade
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 45
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Durable composites - Upcycling plastic bottles into value-added composite applications
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 47
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Matrix - Novel thermoset composites for more competitive and sustainable industries
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 49
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 50
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Aerospace - Slinging rockets into space
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 52
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 53
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Aerospace - Composites push back the final frontier
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 55
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Railway - Composite overhead line catenary system for light rail
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 57
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 58
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Repair - Developing an eddy current-based sensor system for quality assurance of carbon fibres
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 60
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 61
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Inside the lab - Advanced Composite Materials Facility University of Southampton
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 63
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Resin - Development of new type of plastics: Polypropylene 2.0
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 65
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 67
JEC COMPOSITES MAGAZINE - Issue #136 - September/October 2020 - 68
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