... and dynamic fracture toughness tests were performed with straight notched disc bending (SNDB) specimens of Yougnju granite to investigate the microcrack induced fracture toughness anisotropy. In order to conduct dynamic fracture toughness test, split Hopkinson pressure bar (SHPB) apparatus using pulse shaping...

... Abstract In order to investigate the influence of several factors on the mode-I fracture toughness and fracture behavior of rocks, fracture toughness tests were conducted under various conditions of specimen shape and size, loading rate, confining pressure and water vapor pressure...

... system in field to evaluate the degree of fire-damage readily for both brittle and ductile tunnel supporting materials, this research focused on the failure characteristics and evolution on both macro-scale (stiffness, strength and toughness) as well as micro-scale (localization, crack initiation...