Micro-numerical simulation of damage-failure process for concrete material

Based on the surface trimming technique, a gradually Delaunay tetrahedron division scheme is proposed to mesh the test block of concrete which can be taken as an inhomogeneous three-phase composite consisting of mortar matrix, aggregates and the bond between matrix and aggregate in mesoscopic. Through this scheme, the sphere or ellipsoid aggregate can be meshed easily and the element amount generated is far less than that of the map mesh scheme generating on the same precision. By the division scheme, the 3D concrete meso finite element models are established. Finally, with these models, all kinds of numerical experiments such as uniaxial tensile test, uniaxial compress test and bending test of beam have been carried out, and their failure processes are also simulated.