The modeling of crack propagation and coalescence in rocks under uniaxial compression using the novel conjugated bond-based peridynamics

Progressive failure of brittle rocks with non‐isometric flaws: Insights from acousto‐optic‐mechanical (AOM) data

“…It is of fundamental significance to investigate the effects of preexisting flaws on mechanical and cracking behaviours of brittle rocks. Up to date, many experimental and theoretical studies were carried out to investigate mechanical and cracking behaviours in brittle flawed rocks or rock‐like specimens under uniaxial compression. For example, a comparative experimental study on the crack initiation, growth, and coalescence behaviours in gypsum specimens respectively containing open and closed flaws was conducted by Park and Bobet .…”

“…[3][4][5] It is of fundamental significance to investigate the effects of preexisting flaws on mechanical and cracking behaviours of brittle rocks. Up to date, many experimental and theoretical studies 1,4,[6][7][8][9][10][11][12][13] were carried out to investigate mechanical and cracking behaviours in brittle flawed rocks or rock-like specimens under uniaxial compression. For example, a comparative experimental study on the crack initiation, growth, and Nomenclature: a, half flaw length; A, amplitude; AE, acoustic emission; AOM, acousto-optic-mechanical; b, half flaw spacing; DIC, digital image correlation; E s , elastic modulus; F (τ), inter-event time (IET) function; IET, inter-event time; N, number of AE events; NDT, nondestructive testing; PD, peridynamics; R l , flaw length ratio; RT, rise time; t, loading time; t f , failure-time; t i , time instant that the ith AE event occurs; u, horizontal displacement field; v, vertical displacement field; α, flaw inclination angle; σ UCS , peak stress; ε 1 , maximum principal strain field; ε 1c , peak axial strain; ε xy , maximum shear strain field; τ i , mean value of IETs; Δt i , time span for each group of N consecutive AE events coalescence behaviours in gypsum specimens respectively containing open and closed flaws was conducted by Park and Bobet.…”

Numerical simulations of failure characteristics of rock materials under blasting loads using the conjugated bond-pair-based peridynamics

“…3 "共轭键"基近场动力学原理 由于仅有一个近场动力学刚度参数c, 导致"键"基 近场动力学模型中泊松比固定的缺陷 [26,[30][31][32][33] . 为了克 服"键"基近场动力学模型中泊松比固定的缺陷, 本文 建立了"共轭键"基近场动力学数值模型.…”

A bond‐based peridynamic model considering effects of particle rotation and shear influence coefficient

“…Zhu and Ni extended the classical PD formulations by assuming that the bond force depends not only on the axial deformation but also on the bond rotation, so the bond rotation effect was considered in this so‐called enriched PD model and the results showed that the model is capable of improving the prediction accuracy of the effective Poisson's ratio under axial tension. Wang et al derived a novel conjugated BPD model in which the microelastic PD bond energy is not only related to the normal stretch of the bond but also related to the rotation of the conjugated bond angles, and the performance in the simulating of fracture problems in rocks is improved. Diana and Casolo proposed a generalized bond‐based micropolar peridynamics formulation (MPPD) model with shear deformability for linear and nonlinear problems, and the bond energy of this MPPD model depends on the bond stretch, the bond shear deformation, and particles relative rotation.…”