Development and test of a numerical model for pulse thermography in civil engineering

Please always quote using this URN: urn:nbn:de:0297-zib-10980
  • Pulse thermography of concrete structures is used in civil engineering for detecting voids, honeycombing and delamination. The physical situation is readily modeled by Fourier's law. Despite the simplicity of the PDE structure, quantitatively realistic numerical 3D simulation faces two major obstacles. First, the short heating pulse induces a thin boundary layer at the heated surface which encapsulates all information and therefore has to be resolved faithfully. Even with adaptive mesh refinement techniques, obtaining useful accuracies requires an unsatisfactorily fine discretization. Second, bulk material parameters and boundary conditions are barely known exactly. We address both issues by a semi-analytic reformulation of the heat transport problem and by parameter identification. Numerical results are compared with measurements of test specimens.

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Metadaten
Author:Martin Weiser, Mathias Röllig, Ralf Arndt, Bodo Erdmann
Document Type:ZIB-Report
Tag:KARDOS; civil engineering; finite element model; inverse solution; pulse thermography
MSC-Classification:65-XX NUMERICAL ANALYSIS / 65Mxx Partial differential equations, initial value and time-dependent initial- boundary value problems / 65M50 Mesh generation and refinement
80-XX CLASSICAL THERMODYNAMICS, HEAT TRANSFER (For thermodynamics of solids, see 74A15) / 80Mxx Basic methods / 80M10 Finite element methods
PACS-Classification:40.00.00 ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS / 44.00.00 Heat transfer / 44.05.+e Analytical and numerical techniques
40.00.00 ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS / 44.00.00 Heat transfer / 44.20.+b Boundary layer heat flow
Date of first Publication:2008/12/01
Series (Serial Number):ZIB-Report (08-45)
ISSN:1438-0064
Published in:Appeared in: Heat and Mass Transfer: Volume 46, Issue 11(2010), Page 1419