TY - JOUR
T1 - Diffusion and separation mechanism of transient electromagnetic and thermal fields
AU - Wang, Yizhe
AU - Gao, Bin
AU - Tian, Guiyun
AU - Woo, W. L.
AU - Miao, Yunqi
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Electromagnetic mechanism of Joule heating and thermal diffusion has considerable impacts on eddy current pulsed thermography (ECPT). Since ECPT is a multi-physics non-destructive testing (NDT) method depended on both transient electromagnetic and thermal fields, it is crucial to analyze the characteristic of heat propagation mechanism, characteristic time of diffusion as well as the separation of electromagnetic-thermal field for improving detection sensitivity and quantitative analysis. Deep inside to electromagnetic energy, this research constructs a physical-mathematical time-dependent partition model to analyze the whole thermal transient process and consider characteristic times for separating Joule heating and thermal diffusion into four different stage. This study sheds light not only on the deeper understanding of physical mechanism of inductive heating propagation but also on the better modeling and mining of mathematical time-spatial pattern in quantitative defects detection for NDT. Finally, numerical modeling and experiments have been conducted on both artificial slot of steel sample and natural edge crack on the turbine blade sample to validate the proposed study.
AB - Electromagnetic mechanism of Joule heating and thermal diffusion has considerable impacts on eddy current pulsed thermography (ECPT). Since ECPT is a multi-physics non-destructive testing (NDT) method depended on both transient electromagnetic and thermal fields, it is crucial to analyze the characteristic of heat propagation mechanism, characteristic time of diffusion as well as the separation of electromagnetic-thermal field for improving detection sensitivity and quantitative analysis. Deep inside to electromagnetic energy, this research constructs a physical-mathematical time-dependent partition model to analyze the whole thermal transient process and consider characteristic times for separating Joule heating and thermal diffusion into four different stage. This study sheds light not only on the deeper understanding of physical mechanism of inductive heating propagation but also on the better modeling and mining of mathematical time-spatial pattern in quantitative defects detection for NDT. Finally, numerical modeling and experiments have been conducted on both artificial slot of steel sample and natural edge crack on the turbine blade sample to validate the proposed study.
KW - Eddy current pulsed thermography
KW - Joule heating
KW - Physical-mathematical model
KW - Quantitative nondestructive testing and evaluation
KW - Thermal diffusion
U2 - 10.1016/j.ijthermalsci.2015.11.016
DO - 10.1016/j.ijthermalsci.2015.11.016
M3 - Article
AN - SCOPUS:84954102816
VL - 102
SP - 308
EP - 318
JO - International Journal of Thermal Sciences
JF - International Journal of Thermal Sciences
SN - 1290-0729
ER -