Deformation microstructures of Barre granite: An optical, Sem and Tem study

Fracture toughness anisotropy in granitic rocks

“…In this study the source mechanism of acoustic events indicated an increased rate of shear microcracks, which is the result of the macroscopic fracture propagation in mode I. The correlation between microcrack fabric in granitic rocks and anisotropy of physico-mechanical properties such as seismic velocity, dynamic Young's modulus, compressibility, uniaxial compressive and tensile strength, fracture toughness and fracture velocity has been studied by several authors [11][12][13][14][15][16][17].…”

Effects of microstructures on dynamic compression of Barre granite

“…It has been shown that such anisotropy correlates well with the orientations of splitting planes in granites [3]. Using optical techniques, Schedl et al [4] concluded that the splitting planes and anisotropy in Barre granite (BG) were mainly caused by microcracks. In a related investigation aimed at characterizing the microstructures and fracture toughness for a selection of granitic rocks, a good correlation among microcrack density, microcrack length, and fracture toughness has been demonstrated [5,6].…”

Loading Rate Dependence of Tensile Strength Anisotropy of Barre Granite

“…It has been reported that the fabric of microcracks in granitic rocks correlates well with the anisotropy of physical properties, such as uniaxial compressive strength (DOUGLASS and VOIGHT, 1969) and tensile strength (PENG and JOHNSON, 1972). Using optical techniques, SCHEDL et al, (1986) concluded that the splitting planes and anisotropy in Barre granite are mainly caused by microcracks. A good correlation among microcrack density, microcrack length and fracture toughness has been demonstrated MOHANTY, 2008, NASSERI et al, 2005).…”