Mesoscopic Simulation Study Of Barite Concrete Anti-penetration Performance

Based on discrete element software PFC2 D,building background grid model of concrete under simulated different projectile penetration speed of concrete target stress propagation process in the process of penetration and crack extension condition,by tracing the stress transmission through concrete penetration failure process and change process of crack,mesoscopic numerical results to explain macro mechanical response,from the perspective of mesoscopic gradual failure process of concrete penetration are discussed,and points out that the damage to the extension is driven by energy screw become a stage of the damage evolution of concrete fluctuation of the elastic potential energy of the unit is caused by concrete macroscopic crack through internal cause of the sudden destruction,based on energy dissipation concrete penetration in the process of damage failure criterion.At the same time analyzed the concrete cracks and debris in the process of penetration destroy fractal characteristics and transmission of stress wave in the process of penetration.Paper main research work and innovations are as follows:1.Meta model based on mesoscopic granules,uniaxial compression strength test of concrete are simulated,the results of numerical test of the compressive strength of concrete and in line with the good,the strength of relations in line with the current statistical experiential formula,the accuracy of the preliminary numerical simulation model is verified.2.To establish a stable and reliable model of concrete test projectile penetration test by changing the projectile velocity,concrete material material completed different projectile impact rate of concrete penetration test,the test of the bearing capacity,dynamic displacement and strain of the concrete fracture energy and dynamic characteristics were measured and analyzed.3.Based on mesoscopic particles yuan concrete penetration test,the penetration process in the whole process of simulation,studied the different rate of concrete crack in the process of penetration and the fractal characteristics of penetration clastic,and summarizes the general law of fractal.From the perspective of fractal reveals the dynamic impact performance and failure mechanism of concrete.4.The stress wave in the process of penetration of concrete monitoring,from the point of view of theoretical analysis of the stress wave propagation,and the penetration of the concrete in the process of reverse tensile failure simulation analyzed.5.The penetration in the process of accumulation and dissipation and release process in real-time monitoring,are analyzed from the pointsof view of energy high penetration in the process of crack propagation process,based on the energy theory,based on the concrete penetration destroy the strength of the energy dissipation damage criterion...