Finite Element Modeling for Debonding of FRP-to-Concrete Interfaces Subjected to Mixed-Mode Loading
Abstract
:1. Introduction
2. Peeling Test and Linear Elastic Fracture Mechanics (LEFM) Analysis
3. Finite Element Modeling of the Peeling Test
4. Parametric Analyses
4.1. Influence of the Unbonded Length of FRP Lamina
4.2. Influence of the Peel Angle
4.3. Influence of the Shape of Cohesive Law
4.4. Influence of the Damage Initiation and Evolution Laws
5. Full-Range Debonding Process of an FRP-to-Concrete Interface Subject to Mixed-Mode Loading
6. Conclusions
- Regardless of the peel angle, the entire debonding process of FRP-to-concrete interfaces consists of two phases: the initiation phase and the steady-state peeling phase. With the increase of peel angle (e.g., >4 degree), the debonding process shifts rapidly from mode II-dominated to mode I-dominated. Below this angle, the mode I and mode II components have comparable amplitudes, so their coupling effect is very significant.
- The orthotropic plane stress element scheme seems to be most appropriate for the simulation of the FRP lamina during the mix-mode debonding of FRP-to-concrete interfaces and the mechanical properties can be determined based on the composite mechanics.
- In case of large peel angle (e.g., >4 degree), both the DIL and the DEL have an insignificant influence on the peeling process; while, when the peel angle is relatively small, both the DIL and DEL have a significant influence on the peeling force. The quadric DIL leads to higher peeling force than the maximum cohesive strength DIL. Besides, the power DEL leads to higher peeling force than the linear DEL.
- Analyses of the full-range mixed-mode debonding process helps to achieve a thorough understanding of phenomena observed in the peeling test of an FRP-to-concrete interface, in terms of the global load-displacement curves, and the local strain distributions along the FRP lamina length as well as the stress-strain evolution history at different load levels.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Yu, H.; Bai, Y.-L.; Dai, J.-G.; Gao, W.-Y. Finite Element Modeling for Debonding of FRP-to-Concrete Interfaces Subjected to Mixed-Mode Loading. Polymers 2017, 9, 438. https://doi.org/10.3390/polym9090438
Yu H, Bai Y-L, Dai J-G, Gao W-Y. Finite Element Modeling for Debonding of FRP-to-Concrete Interfaces Subjected to Mixed-Mode Loading. Polymers. 2017; 9(9):438. https://doi.org/10.3390/polym9090438
Chicago/Turabian StyleYu, Hui, Yu-Lei Bai, Jian-Guo Dai, and Wan-Yang Gao. 2017. "Finite Element Modeling for Debonding of FRP-to-Concrete Interfaces Subjected to Mixed-Mode Loading" Polymers 9, no. 9: 438. https://doi.org/10.3390/polym9090438