This paper discusses the use of the double-edge notched Brazilian disk test (DNBD) for
measuring true mode II fracture toughness of rocks. The term true emphasises that in this …

A new test, referred to as axially double-edge notched Brazilian disk (ANBD), is proposed to
measure true mode III fracture toughness (K IIIc) of rock materials. The term true denotes a …

The influence of specimen size on the measured values of true mode II fracture toughness
(K IIc) of rocks have been investigated both experimentally and theoretically. In the …

Fracture is of great importance for the behavior of rock engineering structures, such as rock
excavation, tunneling, underground storage of oil, etc. From the perspective of fracture …

Fracture toughness, as a measure of resistance against crack instability and propagation, is
one of the most important parameters in fracture mechanics of rocks and other solid …

Laboratory determination of the mode II fracture toughness K IIC for rocks and rock-type
materials remains a challenge task. One of the testing approaches is the compression of …

A new method called the straight notched disk bending method is developed for mode I
fracture toughness determination using rock cores. Disk specimens of andesite and marble …

Purpose of this research is to investigate the effect of loading span on mode I fracture
toughness for tests conducted by three-point bend geometries. Mode I fracture toughness …

Fracture is a failure mechanism of brittle materials that is of great importance for the
performance of structures. Rapid and violent failures of large-scale geotechnical, mining or …

Towards measuring the mixed-mode I+ III fracture toughness independent of geometry and
loading type, two test specimens were numerically and experimentally compared. The …