curs4_MNEIS
Transcript of curs4_MNEIS
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CURSUL 4
METODE DE CONTROLNEDISTRUCTIV. PREZENTARE
GENERALA
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Termografia activa in infrarosu
Aplicatii in evaluarea nedistructiva
Metodele Lockin si Puls
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Introducere. NDE/NDT/NDI
• Holografia
• Radiografia cu raze X
• Shearografia
• Curenti turbionari
• Termografia in infrarosu
• Ultrasonometria
• Testarea cu particulemagnetice
• Lichide penetrante
• Emisia acustica
• Metode bazate pe vibratii
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• Tehnicile de investigare nedistructiva folosind TIR se folosescpentru detectia defectelor de suprafata si din vecinatateasuprafetei unei piese, controlul acoperirilor, determinareaimperfectiunilor structurale sau a proprietatilor termofizice.
• Principiul termografiei in infrarosu (TIR) pentru evaluareanedistructiva(NDE) consta in evidentierea diferentelor relevantede temperatura sau discontinuitatilor gradientului de temperaturadatorita defectelor si deteriorarilor de sub suprafata pieseiexaminate, diferente ce devin vizibile pe suprafata acesteia.
• Sunt posibile doua tehnici : pasiva si activa. Atunci candtemperatura materialului sau structurii testate este in mod naturaldiferita de temperatura ambianta se poate utiliza schema pasiva.In acest caz diferenta de temperatura (ΔT) sau spot cald/recein raport cu restul de materialului/structurii poate indica ocomportare anormala.
Termografia in infrarosu ca metoda NDE
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Montajul pentru TIR
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TIR activa – Puls si Lockin
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TIR activa
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Surse de excitatie (incalzire), precum lampi optice, becuri deincalzire, ventilatoare cu aer cald/rece, surse bazate pe inductiaelectromagnetica pot fi folosite pentru obtinerea contrastuluitermic.
TIR activa
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Camera A 40
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Banda aplicatii TIR
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TIR – Schema prin reflexie
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Materiale. Proprietati termofizice
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Epruveta din CFRP este o placa avand noua gauri nestrapunse circularecu fund plat avand diferite diametre si aceeasi adancime.
Pentru α = 0.4 mm2/s, se lucreaza cu perioada 20s (frecventa =0.05Hz)
Epruveta de calibrare din CFRP
Aplicatii. Compozit CFRP
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TIR- Montajul pentru metoda Lockin/Puls
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Epruveta CFRP. Rezultate cu metoda Lockin
Single frequency DFT-phase Harmonic approx.(time)-phase
Harmonic approx.(time)-trend 2nd Harmonic approx.(time)-trend
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Pachetul de programe IRT-Lockin
Furnizeaza mai multe metode descanare termica:
• Harmonic Approximation(freq.);
• Single frequency DFT;• Harmonic approximation
(time).Se pot utiliza pentru vizualizare
una dintre cele 53 paletecoloristice
Dimensiunea fisierului inregistratdepinde de timpul total deinregistrare si de frecventa deachizitie a camerei.
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Epruveta CFRP. Rezultate cu metoda Puls
e-model 1th derivative(n=3) e-model 2th derivative(n=3)
e-model time constant(n=5) root-model- residual(n=5)
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Pachetul de programe IRT-Puls / Transient
Furnizeaza mai multe metode descanare termica :
• Root Model;
• e-Model;
• Pulse-Phase-Evaluation.
Se pot utiliza pentru vizualizareuna dintre cele 53 paletecoloristice
Dimensiunea fisierului inregistratdepinde de timpul total deinregistrare si de frecventa deachizitie a camerei.
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Applicatii- placa CFRP cudelaminari( TIR-Puls)
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Applicatii- placa GFRP cudelaminari( TIR-Puls)
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Aplicatii- placa GFRP dupa impact (LVI)
GFRP dupa 10J LVI
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Aplicatii- placa CFRP dupa impact (LVI)
CFRP dupa 15 J LVI: stanga – imagine folosind TIR pasiva;dreapta - imagine Lockin -harmonic approximation (time)-amplitude
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Aplicatii- Placa FML (Al+CFRP) dupa impact ( LVI)
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Aplicatii- Placa FML (Al+CFRP) dupa impact ( LVI)
FML dupa 15 J LVI: imagine Lockin -harmonic approximation (time)-trend
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Aplicatii- Placa GFRP cu delaminare centrala circulara
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Aplicatii- Placa sandwich fete CFRP/miezpoliester dupa impact
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Aplicatii- Placa sandwich fete CFRP/miezpoliester cu delaminare
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Avantaje generale TIR activa
• este o metoda non-contact ne-invaziva;
• se poate examina o suprafata relativ mare la oaceeasi evaluare;
• rezultatele se prezintaintr-o maniera sugestiva, usorde interpretat si pentru luarea deciziilor;
• este o metoda de investigare relativ rapida ;
• se poate lucra in-situ, uneori fara intrerupereafunctionarii obiectului inspectat;
• datele sunt usor de stocat si prelucrat folosindcalculatorul;
• securitatea personalului de inspectie e garantata deexemplu in comparatie cu metodele radiografice.
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• Controlul infiltrarii apei in structuri de tip sandwich,suprafete de comanda, radomuri, carenaje etc.;
• Diagnoza sistemelor de franare;
• Diagnoza sistemelor de degivrare;
• Identificarea crapaturilor si a coroziunii;
• Examinarea sistemelor de propulsie;
• Localizarea delaminarilor si defectelor de lipire instructurile compozite.
TIR . Aplicatii in aeronautica
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TIR activa. Aplicatii in controlul structuriloraeronautice
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TIR activa. Aplicatii in controlul structuriloraeronautice
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TIR activa. Aplicatii in controlul structuriloraeronautice