Surface transient temperature inversion for hidden corrosion characterisation: Theory and applications

V. Vavilov, E. Grinzato, P. G. Bison, S. Marinetti, M. J. Bales

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Corrosion in metals is simulated with variations in plate thickness which are laterally infinite in a 1D model and are represented by milled flat-bottom holes in a 2D model. Temperature contrast over corroded areas is chosen as an informative parameter, quite independent of absorbed thermal energy in the infra-red thermographic test. It is shown that, due to lower sensitivity to rear-side effects at the beginning of the thermal process and increasing 3D heat diffusion effects at the end of the process, there is an optimum time to detect corrosion. A robust inversion function is proposed and its stability against variations in tested material, heat pulse duration and observation time is analysed using numerical modelling. Corrosion in a steel specimen of 1.3 mm thickness is experimentally studied, having proved the validity of the inversion algorithm with an average accuracy of 17% for material loss ranging from 74 to 14%.

Original languageEnglish
Pages (from-to)355-371
Number of pages17
JournalInternational Journal of Heat and Mass Transfer
Volume39
Issue number2
DOIs
Publication statusPublished - Jan 1996

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy(all)
  • Mechanical Engineering
  • Engineering(all)

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