| Summary: | 碩士 === 國立成功大學 === 資源工程學系 === 107 === In the engineering environment, the destruction of structures is mostly due to the growth of tiny cracks inside the material. The fracture criteria can be established by several methods of mechanical tests, and the fracture toughness can be measured.
In this study, the models were established by ABAQUS. The simulation was based on the single edge-cracked four-point bending tests of granite specimens from the study of Lai (2001) and sandstone specimens from the study of Zhang (2017). The material parameters including Young's modulus and Poisson's ratio in ABAQUS models of this study were adopted from their studies. The stress at the fracture and the distance from the crack tip were evaluated. Then, the mode I and the mode II fracture toughness can be obtained.
Comparing the experimental results with simulation results of ABAQUS, the applications of the finite element analysis under different scenarios of element selection, meshing, nodal density and notch drawing method were discussed. The simulated values of the mode I and the mode II fracture toughness were compared with the experimental data, and the values of correlation factors were assessed.
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