The paper describes experimental and numerical results of concrete fracture under quasi-static uniaxial compression. Experimental compression tests were performed on cubic specimens. Fracture in was detected at the aggregate level by means three non-destructive methods: three-dimensional X-ray microcomputed tomography, two-dimensional scanning electron microscope manual digital microscope. discrete element method used to directly simulate experiments. Concrete modelled as a random...

Abstract The paper describes investigation results on fracture in notched concrete beams under quasi‐static three‐point bending by the X‐ray micro‐computed tomography. two‐dimensional (2D) and three‐dimensional image procedures were used. Attention was paid to width, length, height shape of cracks along beam depth. In addition, displacements surface during deformation process measured with 2D digital correlation technique order detect strain localisation before a discrete crack occurred....

SUMMARY A quasi‐static homogeneous drained triaxial compression test on cohesionless sand under constant lateral pressure was simulated using a three‐dimensional discrete element method. Grains were modelled by means of particle clusters composed rigid spheres or with contact moments imitating irregular shapes. Attention paid to the effect initial void ratio and grain shape mixture shear strength, volume changes, force chains, kinetic, elastic dissipated energies. In addition, mean size,...

The article deals with two-dimensional mesoscopic numerical results of fracture in concrete at the aggregate scale a beam notch under bending. focus was on effects both initial micro-porosity ITZs and roughness load-deflection curve propagation location micro- macro-damage. An improved discrete element method (DEM) used for to predict its strength, brittleness fracture. A phase description explicitly take heterogeneity into account. Concrete included aggregate, mortar, interfacial transition...

Abstract: The paper presents the results of experimental and theoretical investigations width fracture process zone (FPZ) on surface notched concrete beams during quasi‐static three‐point bending. To measure two‐dimensional deformations beams, a Digital Image Correlation (DIC) technique was used. Laboratory tests were performed with different beams. experiments simulated two isotropic continuum crack models under conditions: an elasto‐plastic damage one non‐local softening.

A quasi-static homogeneous drained triaxial compression test on cohesionless sand under constant lateral pressure was simulated using a three-dimensional DEM model. Grain roughness modelled by means of symmetric clusters composed rigid spheres imitating irregular particle shapes. The effect grain shear strength, dilatancy, kinetic, elastic and dissipated energies numerically analyzed. Some numerical results were compared with available experimental results.

ABSTRACT The fracture behaviour of concrete and reinforced beams under quasi‐static three‐point bending was comprehensively investigated with experiments at laboratory scale. eight various mixes were tested. influence the shape, volume size aggregate particles reinforcement on studied. Displacements surface measured by means digital image correlation (DIC) technique. Attention paid to formation a localized zone its characteristics. In order avoid effect search patch cut‐off value...

The paper deals with two-dimensional (2D) numerical modelling of hydro-fracking (hydraulic fracturing) in rocks at the meso-scale. A model was developed to characterize properties fluid-driven fractures by combining discrete element method (DEM) computational fluid dynamics (CFD). mechanical behaviour rock matrix simulated DEM and fracturing flow newly pre-existing CFD. changes void geometry were taken into account. initial 2D simulation tests carried out for a segment under biaxial...