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 …

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 values of mode II fracture toughness reported in the literature for several rocks are
studied theoretically by using a modified criterion based on strain energy density averaged …

The centrally cracked Brazilian disk specimen subjected to diametral compression has been
widely used to study mode I, mode II and mixed mode I–II fracture behavior of rocks. The …

Mode I fracture toughness (K IC) is an intrinsic material property that quantifies its resistance
to tensile fracture propagation. The International Society for Rock Mechanics has endorsed …

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 …

Up to now, several methods have been proposed to determine the mode I fracture
toughness of rocks. In this research, different cylindrical and disc shape samples, namely …

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 …

A series of tests with centrally cracked Brazilian disc and un-cracked Brazilian disc
specimens were conducted to investigate the relation between the mode II fracture …