JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 62

TECHNOLOGY software

Structural health of polymer composites:
non-destructive diagnosis using a hybrid NDT approach
A hybrid non-destructive testing (NDT) approach has been developed to
characterize composites damage using simultaneously bulk and guided
ultrasonic waves, acoustic emission, and passive and active infrared
thermography. Combining multiple NDT techniques makes it possible to
optimize the diagnosis of a material's structural health.
s. ChAKI, Associate Professor
W. hArIzI, PhD Student
P. KrAWCzAK, Professor
g. bourse, Associate professor
Polymers and Composites Technology &
Mechanical Engineering Department,
Mines Douai
m. ourAK, Professor
Valenciennes University, IEMN-DOAE

N

on-destructive testing (NDT) methods have proved to be invaluable both in detecting initial defects and assessing the damage
process of polymer composites [1]. Recent NDT applications
for damage monitoring include the use of non-contact optical [2-4],
thermal [5, 6] or acoustic-based [1, 7-9] techniques. Such methods
have had some success in characterizing the damage behaviour of composite materials. However, a more global NDT approach is required to
efficiently and reliably track and quantify both damage initiation and
subsequent damage evolution [10], i.e. to go towards efficient structural health monitoring for preventive maintenance purposes. Therefore,
Mines Douai suggested a hybrid NDT approach to evaluate composites damage under mechanical loading in a more comprehensive manner [11]. This approach uses five different NDT techniques in situ and
in real time: bulk and guided ultrasonic waves [1], acoustic emission,
passive [5] and active infrared thermography [6].

Composite materials
A cross-ply E-glass/epoxy laminate (prepreg) with a [0/90/90/0]
stacking sequence and a 54% fibre volume fraction was chosen to implement the hybrid NDT approach. Plates were compression-moulded at 120°C for 60 min. Tensile tests were performed according to the
ISO 527-5 standard.

Experimental setup for the hybrid NDT approach
Figure 1 shows the experimental setup including the five NDT measurements in situ and in real-time. Three piezoelectric probes were
fixed to the composite sample, named AE1 and AE2 for the two iden-

62

tical acoustic emission (AE) sensors (125-750 kHz), and longitudinal
waves (LW) for the bulk pulse-echo longitudinal wave transducer (5
MHz frequency and 13-mm diameter) placed for a normal beam incidence on the other face of the sample. For acoustic emission, the
acquisition threshold of the acoustic events was fixed at 30 dB in order
to avoid surrounding noises. The AE1 probe also acts as an emitter,
when excited by a high-voltage function generator, in order to generate guided waves (GW), namely the S0 mode, at a frequency of 200
kHz, with the AE2 probe ensuring the reception of the GW. An IR
camera (320x240 pixels with a temperature sensitivity of 10 mK) was

Fig. 1: Experimental setup
for hybrid NDT damage
monitoring

Fig. 2: Step-wise
mechanical loading
profile with the
corresponding NDT
techniques implemented during
stress ramps or
levels

jec composites magazine / No107 August - September 2016



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016

Cover
Edito
OPINION
internet of things
Contents
NEWS
In Brief
Agenda
JEC Conferences 2017
EXPERIENCE COMPOSITES
Innovations
Interview
CCEV
Symposium
BUSINESS
Outlook
Automotive
MANUFACTURING
Injection
Hybrid Structures
Robotics
Total production optimization
Company visit
FEATURED TRANSPORTATION : What share for composites in transportation?
Biocomposites
Railway
Design
Tanks
Truck
Public transportation
SOLUTIONS
Construction
Parasports
Sailing
Watersports
In the world
TECHNOLOGY
Reaction kinetics
Index
Software
Advertisers
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Back Cover
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Cover
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 2
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Edito
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - NEWS
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 5
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Contents
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 7
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - In Brief
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 9
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Agenda
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - JEC Conferences 2017
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Innovations
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 13
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 14
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Interview
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 16
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - CCEV
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Symposium
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 19
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 20
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Outlook
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 22
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 23
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Automotive
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 25
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Injection
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 27
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Hybrid Structures
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 29
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 30
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 31
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Robotics
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 33
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Total production optimization
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 35
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Company visit
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 37
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 39
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 40
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Railway
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 42
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Design
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 44
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 45
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 46
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 47
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Truck
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 49
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Public transportation
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 51
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 52
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Construction
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 54
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Parasports
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Sailing
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Watersports
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Software
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Reaction kinetics
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 60
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 61
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 62
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 63
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 64
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 65
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #107 - August/September 2016 - 67
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