Characterization of mixed mode crack opening in concrete
| Autor: | John Forbes Olesen, Jonas Sejersbøl Jacobsen, Peter Noe Poulsen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Aggregate (composite)
Materials science Plane (geometry) business.industry Crack tip opening displacement Mode (statistics) Building and Construction Structural engineering Displacement (vector) Shear (sheet metal) Crack closure Biaxial loading Mechanics of Materials Constitutive behavior Solid mechanics General Materials Science Composite material business Mixed mode fracture Civil and Structural Engineering Concrete |
| Zdroj: | Jacobsen, J S, Poulsen, P N & Olesen, J F 2012, ' Characterization of mixed mode crack opening in concrete ', Materials and Structures, vol. 45, no. 1-2, pp. 107-122 . https://doi.org/10.1617/s11527-011-9754-5 |
| Popis: | In real concrete structures cracks often open in mixed mode after their initiation. To capture the direct material behavior of a mixed mode crack opening a stiff biaxial testing machine, capable of imposing both normal and shear loads on a given crack area, has been applied. The opening and sliding components of the mixed mode displacement are measured using a custom made orthogonal gauge, and the measurements are used directly as the closed loop control signals. A double notch, concrete specimen is used for the crack investigation. The tests are divided into two steps, a pure Mode I opening step, where a macro crack is initiated in the specimen followed by the mixed mode opening step. The high stiffness of the set-up together with the closed control loop ensures a stable crack initiation followed by a controllable mixed mode opening. The deep notches result in a plane crack, only influenced by material aspects such as the aggregate size and concrete strength. Despite the occurrence of a few, local, secondary cracks during the mixed mode crack opening, the results can be treated as the mixed mode material point behavior of a crack in concrete. Results are reported for a range of mixed mode angles and for varying initial Mode I openings of the crack. |
| Databáze: | OpenAIRE |
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