It is necessary to carry out experiments on cores with different degrees of crack development when studying the seepage law cracked reservoirs and evaluating cracks. The experiment in laboratory requires microcrack development; obtained via conventional drilling cannot meet requirements, efficacies evaluation methods geological parameters used for artificial cracks are not perfect. In this stud...

This paper explores the fracture process based on finite element simulation. Both probabilistic and deterministic methods are employed to model crack initiation, and several commonly used criteria are utilized to predict crack growth. It is concluded that the criteria of maximum tensile stress, maximum normal stress, and maximum Mises stress, as well as the Coulomb-Mohr criterion are able to pr...

The generalized Hoek-Brown (GHB) failure criterion can estimate the rock mass parameters required for mechanics–related analyses such as numerical modeling in geomechanics. determination of GHB has been developed field mechanics. Due to wide use Mohr-Coulomb and lack an existing relationship determining its a mass, equivalent (EMC) be derived from GHB. To determine differences these two criteri...

It is well known that the effect of Coulomb on-site repulsion can significantly alter the physical properties of the systems that contain localized d and/or f electrons. However, little attention has been paid to the Coulomb on-site repulsion between localized p electrons. In this study, we demonstrated that Coulomb on-site repulsion between localized pz electrons also plays an important role i...

Superplastic materials show a very high ductility. This is due to both peculiar process conditions and material intrinsic characteristics. However, a number of superplastic materials are subjected to cavitation during superplastic deformation. Evidently, extensive cavitation imposes significant limitations on their commercial application. The deformation and failure of superplastic sheet metals...