... defects and inhomogeneity. In the approach, microcracks with certain statistics are incorporated in the computational domain. In the approach, fracture strength values are sampled using a Weibull probability distribution. We use the Mohr-Coulomb failure criterion to define an effective stress...

... Abstract: Realistic fracture simulations in rock as a heterogeneous brittle material with significant inherent randomness, requires the use of models that incorporate its inhomogeneities and statistical variability. Dynamic crack growth in rocks is generally associated with complex features...

... hydraulic fracturing poroelasticity matrix reservoir geomechanics dahi taleghani inhomogeneity fracture fluid pressure eshelby hydraulic communication mechanics application mechanics geomechanics symposium upstream oil & gas bedayat ellipsoidal inclusion material property...

... that the effective properties of the material can be deduced from the effects that a cluster of inhomogeneities embedded in an infinite medium has on the far-fields; the inhomogeneities, pores or cracks, can be of arbitrary shapes, sizes, and properties. 1. INTRODUCTION The effective properties of random...

... of the radial compression cones at the specimen's ends. The effect of the specimen's size on its strength is attributed to the local inhomogeneity and the state of discontinuity, including cleats and fractures within the specimen. The relative effect of local inhomogeneity on the strength of a smaller size...

... of scale effects, particularly those relevant to yield and failure. The special characteristics making applications of theory difficult are the extreme problems of inhomogeneity and uncertainty in material properties and pre-existing stress states, which exhibit themselves at all scales. Interpretation...

... INTRODUCTION Two of the most obvious characteristics of rocks are their inhomogeneity and progressive failure. This paper describes a simple model which has been used to investigate possible relationships between these characteristics in the laboratory scale testing of intact rock...

... ABSTRACT: Biaxial friction experiments on a sample with dimensions of 150 cm x 150 cm x 40 cm show that stable slip consistently precedes unstable slip. Inhomogeneity of shear stress relative to frictional strength controls the preseismic slip. The amount and duration of preseismic slip...