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Evaluation of fracture test of selected core-drilled cylindrical specimen
Halfar, Petr ; Sobek, Jakub (referee) ; Keršner, Zbyněk (advisor)
The diploma thesis deals with effective crack model for a cylinder specimen with an chevron-shaped notch, loaded by a three-point bending. The first part of the thesis is theoretical and the it describes the use of fracture mechanics for quasi-brittle materials – concrete and rocks. Furthermore there is described the linear elastic fracture mechanics and founding the geometry function for a different geometries of fracture tests. The second part describes the FEM program, which was used to calculate the fracture parameters, that were used to determine the length of the effective crack and how the program was tested before it was used. The last part describe calculations of fracture toughness by using the effective crack model on selected rock and concrete specimens.
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Evaluation and simulations of fracture test of concrete specimens in selected configurations
Halfar, Petr ; Šimonová, Hana (referee) ; Keršner, Zbyněk (advisor)
This thesis deals with the evaluation of the selected fracture test configurations of concrete specimens. These configurations are the wedge splitting test or combinations of wedge splitting test and three point bending. The first part is theoretical and it describes the use of fracture mechanics on the quasi-brittle material - concrete. There are also described linear and nonlinear fracture theory, improvement process of fracture tests and also determination of the fracture parameters from the tests. The second part is practical and it describes editing of load-displacement diagrams by using GTDiPS application and then evaluation of the diagrams. The result of this work is comparison of the concrete fracture energy in each geometric variations of the tests.
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Evaluation of fracture test of selected core-drilled cylindrical specimen
Halfar, Petr ; Sobek, Jakub (referee) ; Keršner, Zbyněk (advisor)
The diploma thesis deals with effective crack model for a cylinder specimen with an chevron-shaped notch, loaded by a three-point bending. The first part of the thesis is theoretical and the it describes the use of fracture mechanics for quasi-brittle materials – concrete and rocks. Furthermore there is described the linear elastic fracture mechanics and founding the geometry function for a different geometries of fracture tests. The second part describes the FEM program, which was used to calculate the fracture parameters, that were used to determine the length of the effective crack and how the program was tested before it was used. The last part describe calculations of fracture toughness by using the effective crack model on selected rock and concrete specimens.
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Evaluation and simulations of fracture test of concrete specimens in selected configurations
Halfar, Petr ; Šimonová, Hana (referee) ; Keršner, Zbyněk (advisor)
This thesis deals with the evaluation of the selected fracture test configurations of concrete specimens. These configurations are the wedge splitting test or combinations of wedge splitting test and three point bending. The first part is theoretical and it describes the use of fracture mechanics on the quasi-brittle material - concrete. There are also described linear and nonlinear fracture theory, improvement process of fracture tests and also determination of the fracture parameters from the tests. The second part is practical and it describes editing of load-displacement diagrams by using GTDiPS application and then evaluation of the diagrams. The result of this work is comparison of the concrete fracture energy in each geometric variations of the tests.
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