Naslov
Possibilities of Determinmation and Characterization of Subsurface Defects in Material by means of Thermography andD 3D Numerical Model

Autori
Boras, Ivanka ; Švaić, Srećko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) : proceedings / Wiggenhauser, Herbert - Berlin : Deutsche Gesellschaft fur Zerstorungsfreie Prufung ; Bundenstalt fur Materialforschung und Prufung, 2003

Skup
International Symposium Non-Destructive Testing in Civil Engineering

Mjesto i datum
Berlin, Njemačka, 16.09.2003. - 19.09.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
subsurface defects; numerical method; thermography method

Sažetak
The paper presents the method for determination and characterization of subsurface defects in material by means of IR thermography and 3D non-stationary numerical model of heat conduction. The numerical model is based on the control volume numerical method with control volume net adjustable to the problem. The software developed enable the record of temperatures field in different planes and time as well as changing the duration of thermal stimulation time. Inverse method is also included and enables the estimation of defect length on the base of experimentally obtained thermograms. The method was applied on the specimen made of steel with the defects in form of cylinders containing air. The comparison of temperature fields obtained experimentally and numerically was done for the same time expired as well as the dependence of the current contrast vs. time curves related to the defects depth. The mutual interaction of defects on the surface temperature field was analyzed and their influence on the current contrast determined with the aim to recognize the possible errors in determination of defect geometry and position.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA