... from this critical size. For stable shear crack growth, the net shear stress should follow a critical curve obtained numerically. If the net shear stress is larger than its critical value, the shear crack will propagate unstably, otherwise it will be arrested as lack of driving forces. In addition...

..., mechanical crack models, that is, extensile and shear crack models have been used in several studies. In those studies, non-linear stress-strain curves and various behaviors of rock including the changes of effective elastic moduli due to crack growth were simulated. Most of the studies have mainly focused...

... geomechanics Upstream Oil & Gas confinement compression test Wellbore Design Simulation plane shear strength granite interaction fracture tessellation compression friction angle crack growth discrete rock crack growth axial splitting dilatancy Pacific Rocks 2000, Girard, Liebman, Breeds...

... incorporates the fractographic information, e.g. fractal characterization of fracture surfaces, in the probabilistic description of brittle fracture. SFM is based on a few natural assumptions concerning brittle crack growth: 1. The crack path is random, i.e., the crack randomly selects a path of least...

... ABSTRACT: The mechanisms of fracture in a brittle material under a compressive load are examined. Three dimensional crack growth experiments and numerical simulations are used to identify the stable processes of fracture up to the point of failure. In 2-D, a single flaw can cause failure...

... mechanisms and crack growth. However, the fractographic analysis of the hydraulically fractured specimens indicates that the progression of damage during these tests cannot be fully reconstructed from the post-mortal analysis. In addition, it is a time-consuming and expensive program. This consideration...

... geomechanics orientation Dyskin crack growth Reservoir Characterization Upstream Oil & Gas mechanism free surface breakout Wellbore Design borehole breakout borehole situ stress borehole instability wellbore integrity concentration cohesion instability principal stress Germanovich...

... by certain combinations of interacting initial cracks. Thickness experiment Cherepanov crack propagation Dyskin hydraulic fracturing free surface boundary uniaxial compression tensile crack arrangement mechanism crack growth straight crack Germanovich initial crack toughness...