科研之友
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摘要
The energy release rate of an interfacial crack is a basic performance parameter for characterizing interfacial failure, but there is no direct testing method for this. Therefore, a testing method of the critical energy release rate for mode II cracks was proposed in this paper. First, multiple sets of double shear specimens with different precast interfacial crack lengths were prepared, the interface shear experiments were carried out with the improved interface double shear specimens, testing devices and method, and the load-displacement curves of the specimens were obtained. Then, the load-displacement curve of each specimen was normalized, and the corresponding load-displacement curve equation, and the critical displacement or critical load were determined. Finally, the energy release rate of the interfacial mode II crack was calculated based on its definition, and the critical energy release rate was determined. As an example, the results of the double shear tests on fully-bonded fiber reinforced polymer (FRP)-concrete interface showed that the critical energy release rate is 1.10 N/mm. Compared with the experimental results, the simplified theoretical models and the empirical models with the compressive strength of concrete as the main parameter can be acceptable, and the errors are less than 20%, but the errors of the empirical models with the concrete tensile strength as the main parameter are relatively large, which are about 50%.
