Publication Date:
2023-06-09
Description:
We developed a generalized multiphase-field modeling framework for addressing the problem of brittle fracture propagation in quartz sandstones at microscopic length scale. Within this numerical approach, the grain boundaries and crack surfaces are modeled as diffuse interfaces. The two novel aspects of the model are the formulations of (I) anisotropic crack resistance in order to account for preferential cleavage planes within each randomly oriented quartz grain and (II) reduced interfacial crack resistance for incorporating lower fracture toughness along the grain boundaries that might result in intergranular crack propagation. The presented model is capable of simulating the competition between inter- and transgranular modes of fracturing based on the nature of grain boundaries, while exhibiting preferred fracturing directions within each grain. In the full parameter space, the model can serve as a powerful tool to investigate the complicated fracturing processes in heterogeneous polycrystalline rocks comprising of grains of distinct elastic properties, cleavage planes, and grain boundary attributes. We demonstrate the performance of the model through the representative numerical examples.
Description:
Helmholtz-Gemeinschaft
https://doi.org/10.13039/501100001656
Description:
Deutsche Forschungsgemeinschaft
https://doi.org/10.13039/501100001659
Description:
Ministry of Baden-Wuerttemberg
Keywords:
ddc:550.2
;
Brittle fracture
;
Phase-field modeling
;
Multiphase systems
;
Quartz sandstone
;
Anisotropic crack resistance
;
Interfacial crack resistance
Language:
English
Type:
doc-type:article
Permalink
