... Abstract It is essential to understand the mode I fracture toughness of rock under in situ conditions found underground, such as confining pressure, for assessment of the stability of underground rock structures. Some researchers have performed several types of fracture toughness tests...

... role in brittle fracturing. The Cracked Chevron-Notched Brazilian Disc (CCNBD) samples were tested to determine the fracture toughness of monsonite and sandstone samples. Since conducting fracture toughness tests are quite hard compared with the Brazilian test, the tensile strength can be determined...

... of cracks were obtained. hydraulic fracturing strength fracture toughness test reservoir geomechanics stress intensity factor simulation result subcritical crack growth tensile strength Modeling & Simulation damage evolution uniaxial creep test driving-stress ratio Reservoir...

... Abstract The Cracked Chevron Notch Brazilian Disc (CCNBD) method has been used to determine rock fracture toughness value of rocks in rock mechanics since many years. The CCNBD method has advantages over the other proposed fracture toughness tests in terms of the simplicity of sample...

... This study presents a newly suggested test method called "Punch through Shear Test" which was originally proposed by Backers and Stephansson. The purpose of this study is to check the validity of the suggested test method by performing Mode II fracture toughness test for Daejeon granite...