TY - JOUR
T1 - Nondestructive evaluation of carbon fiber reinforced polymer (CFRP)-steel interfacial debonding using eddy current thermography
AU - Zou, Xingxing
AU - Wang, Libin
AU - Wang, Jiaqing
AU - Liu, Jie
AU - Ma, Hao
AU - Bao, Yi
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/3/15
Y1 - 2022/3/15
N2 - When carbon fiber reinforced polymer (CFRP) is used to strengthen steel structures, interfacial debonding between CFRP and steel can substantially compromise the composite action and trigger structural failure. This study investigates eddy current thermography (ECT) for nondestructive evaluation of CFRP-steel interface. Four CFRP-steel specimens with different shapes and sizes of interface defects were tested. With eddy current induced in steel plates, thermal profiles of CFRP were measured to detect and characterize interface defects. The results showed that the proposed ECT system was capable of detecting CFRP-steel interfacial defects within 80 s. ECT results were subjected to edge effects that compromised the evaluation resolution and precise determination of damage regions. The edge effect was prominent in the heating stage but alleviated in the cooling stage because of heat redistribution. The blurring effect caused by the heat diffusion from the internal defect to the external surface of CFRP also hindered precise determination of damage regions. It is recommended to perform ECT for shallow interfacial defect in the cooling stage of steel-CFRP structures to achieve desired results.
AB - When carbon fiber reinforced polymer (CFRP) is used to strengthen steel structures, interfacial debonding between CFRP and steel can substantially compromise the composite action and trigger structural failure. This study investigates eddy current thermography (ECT) for nondestructive evaluation of CFRP-steel interface. Four CFRP-steel specimens with different shapes and sizes of interface defects were tested. With eddy current induced in steel plates, thermal profiles of CFRP were measured to detect and characterize interface defects. The results showed that the proposed ECT system was capable of detecting CFRP-steel interfacial defects within 80 s. ECT results were subjected to edge effects that compromised the evaluation resolution and precise determination of damage regions. The edge effect was prominent in the heating stage but alleviated in the cooling stage because of heat redistribution. The blurring effect caused by the heat diffusion from the internal defect to the external surface of CFRP also hindered precise determination of damage regions. It is recommended to perform ECT for shallow interfacial defect in the cooling stage of steel-CFRP structures to achieve desired results.
KW - CFRP-steel composite
KW - Carbon fiber reinforced polymer (CFRP)
KW - Eddy current thermography (ECT)
KW - Interfacial debonding
KW - Nondestructive evaluation (NDE)
UR - http://www.scopus.com/inward/record.url?scp=85122251646&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85122251646&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2021.115133
DO - 10.1016/j.compstruct.2021.115133
M3 - Article
AN - SCOPUS:85122251646
SN - 0263-8223
VL - 284
JO - Composite Structures
JF - Composite Structures
M1 - 115133
ER -