A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mechanical modeling of granite subjected to indentation loading
The understanding of the mechanical response of Bohus granite, as typical of hard rocks, to percussive drilling is important to improve the efficiency of such an operation. The resulting problem includes material modeling of the selected type of rock under indentation loading conditions. An elastoplastic constitutive material model combined with a damage description is employed for this purpose. The material model parameters are calibrated based on experimental results. Linear Drucker-Prager (DP) plasticity model with pressure-dependent dilatancy and an anisotropic damage model (DFH model) are considered to account for the inelastic deformations and the tensile failure (i.e., mode I fracture), respectively. The resulting constitutive model is implemented numerically into a finite element (FE) commercial software to simulate the material behavior under indentation loading up to its load capacity. In Paper A, the DP material model parameters are determined based on quasi-oedometric tests performed in a previous work and the yield surface and dilation angle are determined. The calibrated material model is implemented numerically taking advantage of Abaqus FE software. The established numerical model is then used to simulate quasi-static indentation test and the force-penetration (P-h) response is predicted. Moreover, a high-speed camera is utilized to monitor the surface of specimens, made of Bohus granite, at different load levels in indentation tests. It is detected that the load-drops observed in the P-hresponse are associated with the material removals on the surface. In Paper B, the anisotropic DFH damage model is employed to predict the material fracture pattern subjected to quasi-static indentation loading. The employed damage model considers the heterogeneity in the material tensile strength using Weibull statistics. It is described how the Weibull parameters are calibrated. The calibrated DFH model is combined with the DP model. The resulting DP-DFH model is used to simulate the material elastoplastic ...
Mechanical modeling of granite subjected to indentation loading
The understanding of the mechanical response of Bohus granite, as typical of hard rocks, to percussive drilling is important to improve the efficiency of such an operation. The resulting problem includes material modeling of the selected type of rock under indentation loading conditions. An elastoplastic constitutive material model combined with a damage description is employed for this purpose. The material model parameters are calibrated based on experimental results. Linear Drucker-Prager (DP) plasticity model with pressure-dependent dilatancy and an anisotropic damage model (DFH model) are considered to account for the inelastic deformations and the tensile failure (i.e., mode I fracture), respectively. The resulting constitutive model is implemented numerically into a finite element (FE) commercial software to simulate the material behavior under indentation loading up to its load capacity. In Paper A, the DP material model parameters are determined based on quasi-oedometric tests performed in a previous work and the yield surface and dilation angle are determined. The calibrated material model is implemented numerically taking advantage of Abaqus FE software. The established numerical model is then used to simulate quasi-static indentation test and the force-penetration (P-h) response is predicted. Moreover, a high-speed camera is utilized to monitor the surface of specimens, made of Bohus granite, at different load levels in indentation tests. It is detected that the load-drops observed in the P-hresponse are associated with the material removals on the surface. In Paper B, the anisotropic DFH damage model is employed to predict the material fracture pattern subjected to quasi-static indentation loading. The employed damage model considers the heterogeneity in the material tensile strength using Weibull statistics. It is described how the Weibull parameters are calibrated. The calibrated DFH model is combined with the DP model. The resulting DP-DFH model is used to simulate the material elastoplastic ...
Mechanical modeling of granite subjected to indentation loading
Shariati, Hossein (author)
2021-01-01
2021:20
Theses
Electronic Resource
English
Energy Evolution and Mechanical Features of Granite Subjected to Triaxial Loading-Unloading Cycles
| DOAJ | 2019
Dynamic Characteristics of Granite Subjected to Intermediate Loading Rate
| Online Contents | 2004
Dynamic Characteristics of Granite Subjected to Intermediate Loading Rate
| Online Contents | 2004