non-destructive testing and health monitoring

Non-Destructive Testing, Evaluation

and Health Monitoring of Composites

Joris DegrieckUGent-MMS

References to collaborations with:

• UGent: CMST, UGCT, DRAFT, LumiLab, SCRiPTS, TELIN-IPI

• VUB: B-Phot, MeMC, AVRG

• KULeuven: CMG

• SLC-Lab , Com&Sens

References to collaborations with industry

Acknowledgements: • UGent BOF, SIM, Vlaio ( IWT), FWO, EU-FP7

Meeting Materials: Composites – SIM & M2i & BvM - 2016, May 10th, Antwerp, Belgium

Meeting Materials: Composites – SIM & M2i & BvM2016, May 10th, Antwerp, Belgium

Fibre reinforced composites today:

“mature” materials!

Aeronautics and space

Civil engineering structures Automotive sector

Sports and recreation

Railway transport

Mechanical constructions

Maritime constructions


...but yet, from time to time ...

� Need for adequate, fast, non-intrusive NDT/E and monitoring techniques !

Damage tolerant Cetex (Ten Cate, Nl)


Non-Destructive Testing and Health Monitoring

of Composites - A selection…

• Established techniques

– Ultrasonic echography

– Acoustic emission

– Infrared thermography

– Radiography

– Micro-tomography

– Fiber optic strain & temperature sensing

• Emerging technologies

• Towards novel composites sensing technologies


Ultrasonic echography for impact

damage detection and localization

reflection

C-scan

ABC-scan: 3D reconstruction of

echo locations

transmission

C-scan

impact

locationemitted pulse registered echo’s

water transmitter

receiver

registered pulse


Micro-tomography for material research

Carbon-PPS with embedded optical fibers

Carbon-PPS, failed in bending

X-ray source

sample

rotatingfixture

X-raydetector

(In collaboration with UGCT)


Micro-tomography for quality control(In collaboration with UGCT and XRE)

Composite bicycle front fork under inspection


Micro-tomography for quantitative

determination of fibre volume fraction

determination of resin fraction

� Obtained fibre volume fraction:Vf = 5.64 %

(In collaboration with UGCT)

determination of fibre fraction andfraction of impurities


Embedded optical fibre sensors(in collaboration with Com&Sens)


Monitoring of stress resultants in automotive

composite control arm

(In collaboration with Com&Sens and SLC-Lab)


Cure stress and health monitoring

of composite water lock door






– Ultrasonic characterisation

– Capacitive sensors for (distributed) cure monitoring

– Polymer waveguides for (distributed) strain & temp sensing



Ultrasonic polar scans contain encryption of

(orthotropic) elastic properties

ALUMINUM [0]8 C/E [0 90]2S C/E


Ultrasonic polar scanning for fatigue damage

characterisation

[+45,-45]8S

FIBER ORIENTATION

+44; -46

FIBER ORIENTATION

+42; -40

FIBER ORIENTATION

+37; -37

FIBER ORIENTATION

+34; -31

• gradual shift of fibre orientations• gradual shift of orthogonal stiffnesses• change of principal axes or orthotropy !


Capacitive sensors for cure monitoring

IDC (InterDigital Capacitor)13 mm by 13 mm

temperature sensor

-55 -> +125 ⁰C

deformable network using

stretchable interconnections

(aerospace hinge arm)

(in collaboration with UGent-CMST, SLC-Lab)


Polymer waveguide strain &

temperature sensors

16

Polymer cladding

Polymer core

thin waveguide based

sensor patches will be

integrated with composites

(in collaboration with UGent-CMST)







– Mechano-luminescent matrices, thin film technologies, sensor

integration


Towards a new generation of composites

sensor-technologies

mechano-

luminescent

composites

fully integrated

thermocouple

directly (inkjet)

printed strain

gauge

(in collaboration with UGent LumiLab, Draft and Scripts)

Composites Research@ UGent

Want additional information?

[email protected] & [email protected]+32 9 33 10428 +32 9 33 10432

[email protected] developer

Ghent University - Department of Materials Science and EngineeringMechanics of Materials and Structures Research Group

Tech Lane Ghent Science Park – Campus ATechnologiepark-Zwijnaarde 903, 9052 Zwijnaarde (Gent)

Belgium

www.composites.ugent.be

non-destructive testing and health monitoring

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