Fracture Mechanism of Brazilian Discs with Multiple Parallel Notches Using PFC2D

Abstract

This study presents crack initiation, propagation and coalescence at or near pre-existing open cracks in a numerical

Fracture Propagation in Brazilian Discs with Multiple Pre-existing Notches by Using a Phase Field Method

“…6b, c, d). We compare the final crack patterns obtained by the phase field modeling with those obtained from DDM simulation [12], PFC simulation [13], and experimental tests [11]. The observations in Fig.…”

“…For example, Haeri et al [11] used the displacement discontinuity method (DDM) to simulate crack propagation in Brazilian discs with multiple notches. Sarfarazi et al [12] applied the particle flow code (PFC) and compared the PFC simulations with the results by using DDM.…”

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

“…Combined with the above analysis, the crushing process of the sample can be divided into four stages under uniaxial compression: elastic deformation stage, plastic stage, hardening stage and rheological stage. According to the relevant literature [10][11][12][13][14], the relatively mature constitutive model of coal-rock and it can be accepted by everyone is that the micro-elastic fracture of coal-rock is developed steadily in the first, which corresponds to the elastic deformation stage in macroscopic. And then, the unsteady fracture of coal-rock begins to develop, the macroscopic yield of coal-rock is shown, and the yield stress is about 2/3 of the peak strength.…”

The effect of a pre‐existing crack on a running crack in brittle material under dynamic loads

“…Some studies about multiple crack fracture behavior under static loading have been performed in different rock-like materials either by numerical simulation, [18][19][20][21][22][23] by experiment [24][25][26][27][28] or by combining both of them. [29][30][31][32][33] Nasri et al 22 used the extended finite element method to analysis the interaction effect between two cracks under tensile load, but experimental study was not carried out due to the limitation of experimental technology. Yin et al 27 studied the coalescence behavior of two parallel pre-existing surface cracks in granite under compression.…”

“…In the study of the fracture mechanism of multiple cracks under static loads, some researchers used cubic or rectangular specimens containing two or three cracks under compression, [19][20][21][22][24][25][26][27][28]30 and some researchers used Brazilian disc specimens under compression. 29,[31][32][33] However, for multiple cracks under dynamic loading, no mature configuration specimen is available, and the corresponding experimental study under dynamic load, such as impact and blast, have little achievements. Therefore, it is imperative to develop an effective configuration specimen containing multiple cracks to perform dynamic experimental study.…”