TY - JOUR
T1 - Mode I crack in particulate materials with rotational degrees of freedom
AU - Esin, M.
AU - Dyskin, A. V.
AU - Pasternak, E.
AU - Xu, Y.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - A wide use of engineering and natural materials with microstructure makes it necessary to develop methods of describing mechanical behaviour of structures made of these materials. Yet, despite extensive research many aspects of fracture initiation and propagation in such materials remain unclear. We consider Mode I crack in particulate materials whose constituents are able to rotate. We model such materials in 2D as an idealised slightly cemented granular material where circular shaped thin discs are glued together. In order to model the crack, the bonds between a few pairs of discs are removed with crack opening being introduced by a thin wedge. Rotations of the particles are analysed using physical experiments, an analytical model and a DEM numerical simulation. It is found that the DEM simulations give results very close to the experimental ones. Furthermore, the particle rotations during fracture propagation can be well described by the pseudo-Cosserat continuum with constrained microrotations.
AB - A wide use of engineering and natural materials with microstructure makes it necessary to develop methods of describing mechanical behaviour of structures made of these materials. Yet, despite extensive research many aspects of fracture initiation and propagation in such materials remain unclear. We consider Mode I crack in particulate materials whose constituents are able to rotate. We model such materials in 2D as an idealised slightly cemented granular material where circular shaped thin discs are glued together. In order to model the crack, the bonds between a few pairs of discs are removed with crack opening being introduced by a thin wedge. Rotations of the particles are analysed using physical experiments, an analytical model and a DEM numerical simulation. It is found that the DEM simulations give results very close to the experimental ones. Furthermore, the particle rotations during fracture propagation can be well described by the pseudo-Cosserat continuum with constrained microrotations.
KW - Constrained rotations
KW - Discrete element method
KW - Fracture
KW - Particulate materials
KW - Small-scale Cosserat continuum
UR - http://www.scopus.com/inward/record.url?scp=85010919204&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2016.12.024
DO - 10.1016/j.engfracmech.2016.12.024
M3 - Article
AN - SCOPUS:85010919204
SN - 0013-7944
VL - 172
SP - 181
EP - 195
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
ER -