Advances in Crack Characterization by Lock-In Infrared Thermography

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• 作者：R. Celorrio ; A. J. Omella ; A. Mendioroz…
• 关键词：Cracks ; Discontinuous Galerkin ; Finite elements ; Thermal resistance ; Thermography
• 刊名：International Journal of Thermophysics
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：36
• 期：5-6
• 页码：1202-1207
• 全文大小：611 KB
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• 作者单位：R. Celorrio (1)
  A. J. Omella (1)
  A. Mendioroz (2)
  A. Oleaga (2)
  A. Salazar (2)
  
  1. Departamento de Matem谩tica Aplicada, EINA/IUMA, Universidad de Zaragoza, Campus R铆o Ebro, Edificio Torres Quevedo, 50018聽, Zaragoza, Spain
  2. Departamento de F铆sica Aplicada I, Escuela T茅cnica Superior de Ingenier铆a, Universidad del Pa铆s Vasco (UPV/EHU), Alameda Urquijo s/n, 48013聽, Bilbao, Spain
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Mechanics
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-9567

文摘

Detecting cracks in a nondestructive way is a challenge that has been addressed for decades but which is not completely solved yet. For the last years, infrared thermography has been the preferred photothermal technique to detect cracks, because of its capability to record surface temperature images. In this work, a discontinuous Galerkin (DG) finite element method has been developed to simulate the temperature evolution of an opaque sample with inner cracks characterized by their thermal contact resistance. DG methods are natural tools to tackle physical problems with discontinuous solutions where classical finite element methods fail. Discontinuous finite elements allow calculation of the surface temperature modification due to the presence of cracks of any size, shape, and thickness. Lock-in infrared thermography measurements, performed on calibrated vertical cracks in metallic samples, confirm the validity of the model.