Numerical modeling and experimentation of dynamic indentation with single and triple indenters on Kuru granite

Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

“…This leads to simultaneous initiation and propagation of multiple cracks and finally complete pulverization of the sample, as well as a fast release of elastic strain energy as kinetic energy of the rock particles, acoustic emission, and generation of frictional heat. Another consequence of this is that the scatter observed in the low strain rate testing of brittle materials is typically smaller at high strain rates [7,9], since the deformation or fracture is not anymore localized only at the weakest area of the sample. In this paper, however, the scatter in the low rate tests is somewhat lower than in the high strain rate tests, which may be explained by the size effect.…”

“…The effect of strain rate on the mechanical behavior of various rocks has been widely studied in compression [3,4], tension [5][6][7][8][9], and bending [1,10]. Liang et al [11] studied the effects of loading rate on the fracture characteristics in the quasi-static region of granite rock.…”

Prediction of cuttability from rock cutting resistance

“…The numerical code RFPA2D (Rock Failure Process Analysis, 2D) (Zhu and Tang, 2006) was used to consider the heterogeneity of rock and simulate the evolution of dynamic fracture initiation and propagation due to impact loading from double indenters. Saksala et al (2013) simulated dynamic indentation with a numerical method. The method was validated by dynamic indentation experiments with single and triple indenters on Kuru granite.…”