TY - JOUR
T1 - Effects of mechanical properties of adhesive and CFRP on the bond behavior in CFRP-strengthened steel structures
AU - Li, Chuanxi
AU - Ke, Lu
AU - He, Jun
AU - Chen, Zhuoyi
AU - Jiao, Yang
N1 - Funding Information:
The authors would like to acknowledge the financial support from the National Natural Science Foundation of China [Grant Nos. 51778069 & 51708047 ], the National Program on Key Basic Research Project of China (973 Program) [Grant No. 2015CB057701], and the China Scholarship Council [Grant No. 201808430209 ].
Publisher Copyright:
© 2018 Elsevier Ltd
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - The bond between carbon fiber-reinforced polymer (CFRP) composites and steel is a key issue in CFRP-strengthened steel structures. The determination of key parameters in the bond strength model remains debatable. We studied the bond behavior between CFRP and steel, focusing on the effects of different types of epoxy adhesive and CFRP on the failure modes, bond–slip relationships, and bond strength parameters. The results show that due to the use of various materials, some specimens fail in interface debonding characterized by brittle failure, whereas others have cohesive failure or CFRP delamination characterized by ductile failure. The bond–slip models showed gentle-slope descending branches for interfaces with ductile failure, which is missing in brittle failure. The bond–slip relationships of most specimens can be simplified as bilinear models. However, trilinear models should be used for the specimens failing in the delamination and tearing of CFRP. As for the modes of interface debonding and CFRP superficial delamination, the maximum shear stresses in the interface linearly correlate with the elastic moduli of adhesive. The nonlinear mechanical behavior of interfaces can be well simulated by a cohesive zone model.
AB - The bond between carbon fiber-reinforced polymer (CFRP) composites and steel is a key issue in CFRP-strengthened steel structures. The determination of key parameters in the bond strength model remains debatable. We studied the bond behavior between CFRP and steel, focusing on the effects of different types of epoxy adhesive and CFRP on the failure modes, bond–slip relationships, and bond strength parameters. The results show that due to the use of various materials, some specimens fail in interface debonding characterized by brittle failure, whereas others have cohesive failure or CFRP delamination characterized by ductile failure. The bond–slip models showed gentle-slope descending branches for interfaces with ductile failure, which is missing in brittle failure. The bond–slip relationships of most specimens can be simplified as bilinear models. However, trilinear models should be used for the specimens failing in the delamination and tearing of CFRP. As for the modes of interface debonding and CFRP superficial delamination, the maximum shear stresses in the interface linearly correlate with the elastic moduli of adhesive. The nonlinear mechanical behavior of interfaces can be well simulated by a cohesive zone model.
KW - Bond behavior
KW - Bond–slip model
KW - CFRP-steel interface
KW - Carbon fiber-reinforced polymer
KW - Steel
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U2 - 10.1016/j.compstruct.2018.12.020
DO - 10.1016/j.compstruct.2018.12.020
M3 - Article
AN - SCOPUS:85058970603
SN - 0263-8223
VL - 211
SP - 163
EP - 174
JO - Composite Structures
JF - Composite Structures
ER -