Dr. Marc GEORGES Project Coordinator Centre Spatial · PDF fileDr. Marc GEORGES Project...

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1 Aerospace Testing, Hamburg, 2011 FANTOM Project Overview Dr. Marc GEORGES Project Coordinator Centre Spatial de Liège – Université de Liège

Transcript of Dr. Marc GEORGES Project Coordinator Centre Spatial · PDF fileDr. Marc GEORGES Project...

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1Aerospace Testing, Hamburg, 2011

FANTOM Project Overview

Dr. Marc GEORGESProject Coordinator

Centre Spatial de Liège – Université de Liège

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Summary

• Introduction - Motivations• Basic Principles• FANTOM idea• Implementation

– Main project figures– Consortium– Workpackages– Results– Current-future works

• Conclusion

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Motivation

• FANTOM adresses– Inspection activities– During Development Phase of Aircraft

• In particular :

Elements thermo-mechanicalbehaviour assessment Defect detectionStructural testing

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Motivation

• Deformation• Dilatation• Coeff. Thermal Expansion•……

Elements thermo-mechanicalbehaviour assessment Defect detectionStructural testing

Need of simultaneous measurement of• Temperature• Shape change

Temperature Measurement

Displacement FieldMeasurement

Comparison withFinite Element Analysis

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Motivation

Elements thermo-mechanicalbehaviour assessment Structural testing Defect detection

Thermography for stress analysis

Strain measurementby local strain gauges

• Fatigue test• Static loads• Ultimate loads• …..

Displacement measurementby displacement transducers or non contact 3D optical systems

Observe start of damage

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Motivation

Elements thermo-mechanicalbehaviour assessment Structural testing Defect detection

Detection of defect :• Element undergoes stimulation

thermalstaticdynamic

• Observation of local behaviour

Thermography :Local Temperature change

Holography/Shearography :Local deformation

Techniques are complementary• Features appear or not• Features can prevent defect identification

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Motivation

Structural testingElements thermo-mechanicalbehaviour assessment Defect detection

SimultaneousMeasurement of

Temperature – Variation of temperature

Displacement – DeformationAND

FANTOM : Full-Field Advanced Non-Destructive Technique for Online Thermo-Mechanical Measurement on Aeronautical Structures

Combined Holography-ThermographySingle Full-Field SensorSimultaneous capture of Temperature-DisplacementEach image element carries both information

Holography in Long Wave InfraRed (LWIR) rangeHOW ?

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Basic Principles

• Holography / Electronic Speckle Pattern Interferometry

[ ]),(cos),(),(),( 11,1 yxyxCyxIyxI average ψ+=Time t1 :

[ ]),(),(cos),(),(),( 22,2 yxyxyxCyxIyxI average ϕψ ∆++=Time t2 :

Zoom of recordedintensity pattern

Zoom of localinterference pattern

I(x,y)

⎥⎦⎤

⎢⎣⎡∆

÷−2

),(sin),(21yxyxII ϕ

∆ϕ(x,y) λ/2

Displacement Map

λlaser wavelength

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FANTOM idea

• Holography / Electronic Speckle Pattern Interferometry

In the LWIR range

Usually appliedin the visible range

LWIR Thermographic camera

CO2 laser λ = 10 µm

λ = 8-14 µm

λ = 400-700 nm

Optical combinationfor beams

on the sensor=

Major FANTOM Issue

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FANTOM idea

,.)(xI ,.)(xI

Hologram

Thermal background

Decoupling both=

Major FANTOM Issue

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ImplementationFP7 – Call 1 Transport (Aeronautics)• THEME AAT.2007.4.1.1.• Aircraft Development Cost - Design Systems and Tools

• Duration : 36 months• Start : Dec 1, 2008• End : Nov 30, 2011• EC grant : 1.7 M€

Partner Country Profile

Centre Spatial de LiègeUniversité de Liège

Coordinator – University Research CentreDevelopment/application of non destructive testingtechniques

Institut für Technische OptikUniversität Stuttgart

University Research CentreSpecialist of Holography

InfraTec GmbH SME – Development of Thermography system and applications

Centro de TecnologiasAeronauticas

Research CentreSpecialist of Non Destructive Testing – Structural Tests

Optrion S.A. SME – Development of Holography system and applications

Innov Support SME – Servicing partner

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Work Packages

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP1 :Establish State of Art of Technique/ComponentsEstablish End Users RequirementsCross bothEstablish Specifications

With help of Club of End-Users :

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Work Packages

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP2 :Concept of set-upChoice of critical components :

• Laser• Camera sensor/technology

Cooled 640x512

Wavelength ?

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Work Packages

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP3 :Study of TechniquesDevelopments of new High Resolution CameraDecoupling Thermal-Deformation signals

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Work Packages

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP4 :Building of samples

Various materials : CFRP, Kevlar, Glass fibersVarious defects

Certification by other NDT techniques Disbonds

Damaged core

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Results

• Decoupling temperature and deformation

Hologram

Thermalbackground

∆T°

∆φ

Isolate specklegrams from thermal background

• Separate acquisition of thermogram (laser OFF) and specklegram (laser ON)Not perfectly simultaneous

• Use specific algorithms to recalculate thermogram from specklegramSimultaneous

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Results

Real thermal signalReconstructed thermal signal Deformation map

• Decoupling temperature and deformation

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ResultsPhase variation (modulo 2π) Deformation Temperature variation

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Results• Defect detection

– CTA sample– Halogen Heating Temperature Map

Deformation map

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Current Work Package

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP5 :Concept of prototype Building of prototypeValidation at CTA (NDT, Structural testing)

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• Performances (2 options)

Uncooled - µBolometers• 640x480 pixels

• Frame rate : 50 Hz (rolling frame)

• NETD : <50 mK

• Displacement : 1 µm to 100 µmVarioCAM hr from JENOPTIK

Cooled - MCT

ImageIR LWIR from INFRATEC

• 640x512 pixels

• Frame rate : 100 Hz (full resolution - snapshot)

• Integration : can be 1 µs

• NETD : <25 mK

• Displacement : 1 µm to 100 µm

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Future Work Packages

WP1 Specifications

WP2 Conceptual design

WP3 DevelopmentsWP4 Samples

WP6 Industrial validation

WP7 Dissem-Exploitation

WP5 Prototype building

WP8 Management

WP6 :Industrial validation at Airbus (Structural testing) – D41 - Toulouse

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ConclusionWe have shown

• Combination Holography-Thermography in single sensor• Simultaneity of both information feasible

Benefits for inspection capabilities in aircraft development

• Gain in inspection time– 1 system instead of 2 systems

• Better correlation between both information– No need of post-processing for images superposition

• Complementary techniques for defect detection in single sensor• Could be used out of laboratory conditions

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Thanks for Your Attention [email protected]

Thanks to FANTOM collaborators

J-F. Vandenrijt, C. Thizy

I. Alexeenko, G. Pedrini, W. Osten

B. Vollheim, G. Dammass, M. Krausz

I. Lopez, I. Jorge, I. Saez de Ocariz

J. Rochet, G-M. Hustinx

J. Depauw