Meso-scale Numerical Simulation Of Cementitious Composites Destruction Process

Mesoscopic level, the concrete three-phase material is divided into three partsof the aggregate, matrix and interfacial transition zone. Therefore, the exploration of theinterfacial transition zone of the mechanical properties of the concrete failure mechanismbased on meso finite element analysis are necessary. This paper will analyze the impact of thetransition zone of the concrete, the establishment of three-and-white relations, focus gradationoverall performance.1.Analysis using random aggregate model of concrete static tension and compressionprocess, analyze the occurrence of cracks in concrete damage and extended. In themicroscopic angle can reasonably describe the overall strength of concrete aggregate shapeeffects, found that as the aggregate number of sides increases, the concrete compressivefailure strength increases.2.Characteristics of the matrix of the concrete changes on the overall mechanicalproperties of the concrete, the concrete compressive strength found the matrix material withthe strength and elastic modulus decreased weakened, the rubber content of aggregates were10%,20%,30%replaced by an equal volume of fine aggregate, toughness values increasedby5.4%-24%. Research different gradations of concrete strength, evaluated by numericalsimulation to analyze the concrete matrix and Gradation. Found that the design of multi-levelwith the mechanical properties of concrete promote the role of engineering in the design ofthe actual reference.3.In this paper the Matlab and Ansys/Ls-dyna combination makes random characteristicmodel model can be applied to the establishment of commercial software, the use of explicitalgorithms and optimizing the computation efficiency unit, so that numerical calculations aremore applicable. And the Weibull distribution based on two-dimensional random aggregatemodel extended to three-dimensional, perspective in meso explained under static and dynamiccompression macroscopic failure process.4.The impact behavior of concrete, this article from meso-scale simulation ofthree-dimensional solid concrete SHPB impact deformation and failure process analysis of thestrain rate effect on the concrete strength. Simulated crack propagation, intensity and dynamicgrowth factors such DIF coincide with the actual situation.