Subcritical Debonding Characterization of GFRP-Concrete Bonded Interface Using Modified Single Cantilever Beam Specimens
Publication: Journal of Aerospace Engineering
Volume 37, Issue 1
Abstract
Subcritical debonding of glass fiber reinforced polymer (GFRP)-concrete bonded interface in both the air (room environment) and water is characterized using the modified single cantilever beam specimens. A modified specimen design is uniquely proposed to overcome the potential large deformation of the GFRP substrate; i.e., a thin aluminum beam is glued to the top of GFRP strip to form a stiffer composite beam. A two-parametric elastic foundation model is employed to calculate the compliance and energy release rate (ERR) of the modified specimens, and it is then used to indirectly calculate the crack length, which is verified by the direct experimental strain measurements. Experimental programs using the modified specimens are conducted to characterize the subcritical debonding behavior of the GFRP-concrete bonded interface, and the effect of moisture condition on the subcritical debonding rate is evaluated. Meanwhile, the water-based epoxy primer promoting the interface bonding is explored. In particular, the relationship between the applied ERR and measured debonding growth rate is established. The test results demonstrate that the subcritical debonding growth occurs at slow loading rate and the failure mode shifts from the cohesive failure within concrete to the adhesive failure along the bonded interface. The subcritical debonding test method developed and the modified specimen proposed can better reveal the actual degradation mechanism of bimaterial bonded interface under different environments and loading rates.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge partial financial support from the National Natural Science Foundation of China (Grant Nos. 51809164 and 11972224) and “the Fundamental Research Funds for the Central Universities” of China (Grant No. B200201010) to this study.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 37 • Issue 1 • January 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 23, 2023
Accepted: Aug 3, 2023
Published online: Oct 4, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 4, 2024
ASCE Technical Topics:
- Analysis (by type)
- Beams
- Bonding
- Cantilevers
- Composite beams
- Engineering fundamentals
- Engineering materials (by type)
- Failure analysis
- Failure modes
- Fiber reinforced polymer
- Forensic engineering
- Load tests
- Material failures
- Materials characterization
- Materials engineering
- Materials processing
- Polymer
- Structural engineering
- Structural members
- Structural systems
- Synthetic materials
- Tests (by type)
Authors
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