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Quantitative defect reconstruction in active thermography for fiber-reinforced composites

  • Carbon-fiber reinforced composites are becoming more and more important in the production of light-weight structures, e.g. in the automotive and aerospace industry. Thermography is often used for non-destructive testing of these products, especially to detect delaminations between different layers of the composite. In this presentation, we aim at methods for defect reconstruction from thermographic measurements of such carbon-fiber reinforced composites. The reconstruction results shall not only allow locating defects, but also give a quantitative characterization of the geometric properties of the defect. We discuss the simulation of the measurement process using finite element methods, as well as the experimental validation. In order to take anisotropic heat transport due to the fibers into account, we compare describing layers separately by individual diffusion tensors with using an averaged diffusion tensor. Especially in pulse thermography, thin boundary layers with steepCarbon-fiber reinforced composites are becoming more and more important in the production of light-weight structures, e.g. in the automotive and aerospace industry. Thermography is often used for non-destructive testing of these products, especially to detect delaminations between different layers of the composite. In this presentation, we aim at methods for defect reconstruction from thermographic measurements of such carbon-fiber reinforced composites. The reconstruction results shall not only allow locating defects, but also give a quantitative characterization of the geometric properties of the defect. We discuss the simulation of the measurement process using finite element methods, as well as the experimental validation. In order to take anisotropic heat transport due to the fibers into account, we compare describing layers separately by individual diffusion tensors with using an averaged diffusion tensor. Especially in pulse thermography, thin boundary layers with steep temperature gradients occurring at the heated surface need to be resolved. Here we consider the combination of a 1D analytical solution combined with numerical solution of the remaining defect equation. Moreover, we discuss the mathematical modelling of various defects like delaminations and undulations, as well as the description of inhomogeneous heating by geometric optics. Finally, we will describe PDE-based methods for the solution of the inverse problem as well as ideas for fast heuristic methods to avoid expensive computations.zeige mehrzeige weniger

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Metadaten
Autor*innen:S. Götschel
Koautor*innen:Christiane Maierhofer, Jan P. Müller, Nick Rothbart, M. Weiser
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2016
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Active thermography; Finite-element simulation; Quantitative nondestructive evaluation; Reconstruction; Transient thermogram
Veranstaltung:19th World Conference on Non-Destructive Testing
Veranstaltungsort:Munich, Germany
Beginndatum der Veranstaltung:13.06.2016
Enddatum der Veranstaltung:17.06.2016
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:26.09.2016
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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