Bond-slip models for CFRP plates externally bonded to steel substrates

Bond-slip models for CFRP plates externally bonded to steel substrates This paper examines the development of the bond-slip models for carbon fiber reinforced polymer (CFRP) plates externally bonded to steel substrates where debonding failure occurs in the adhesive layer. Thirteen single-shear bonded joints were tested to investigate the effects of the adhesive properties and the adhesive thickness on the bond-slip behavior of the interfaces. The test results showed that the bond-slip relationship for the bonded joints with the Sikadur-30 adhesive was approximately triangular, whereas that with the Araldite-2015 adhesive can be simplified to a trapezoidal shape. Based on a careful analysis of a database of CFRP-to-steel bonded joints, expressions were formulated for the key parameters employed in the triangular and trapezoidal bond-slip models, including the interfacial fracture energy Gf, the peak interfacial shear stress τmax, and the relative slip indexes s1, s2 and sf. The influences of the adhesive properties and the adhesive thickness were accounted for in the proposed models. The comparisons between the predicted and test results showed that the predicted results have good agreement with the collected test data and that the proposed models have reasonable accuracy. The proposed bond-slip models are expected to be useful in the theoretical modeling of CFRP plate-strengthened steel members. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Composite Structures Elsevier

Bond-slip models for CFRP plates externally bonded to steel substrates

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0263-8223
eISSN
1879-1085
D.O.I.
10.1016/j.compstruct.2017.10.033
Publisher site
See Article on Publisher Site

Abstract

This paper examines the development of the bond-slip models for carbon fiber reinforced polymer (CFRP) plates externally bonded to steel substrates where debonding failure occurs in the adhesive layer. Thirteen single-shear bonded joints were tested to investigate the effects of the adhesive properties and the adhesive thickness on the bond-slip behavior of the interfaces. The test results showed that the bond-slip relationship for the bonded joints with the Sikadur-30 adhesive was approximately triangular, whereas that with the Araldite-2015 adhesive can be simplified to a trapezoidal shape. Based on a careful analysis of a database of CFRP-to-steel bonded joints, expressions were formulated for the key parameters employed in the triangular and trapezoidal bond-slip models, including the interfacial fracture energy Gf, the peak interfacial shear stress τmax, and the relative slip indexes s1, s2 and sf. The influences of the adhesive properties and the adhesive thickness were accounted for in the proposed models. The comparisons between the predicted and test results showed that the predicted results have good agreement with the collected test data and that the proposed models have reasonable accuracy. The proposed bond-slip models are expected to be useful in the theoretical modeling of CFRP plate-strengthened steel members.

Journal

Composite StructuresElsevier

Published: Jan 15, 2018

References

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