Study On Mechanical Properties And Dynamic Anti-penetration Properties Of Ultra-high Strength Of Steel Fiber Concrete

Ultra-high strength of steel fiber silicate concrete, often referred to as the steel fiber reinforced concrete is reinforced composite materials which is evenly mixed cement concrete with the appropriate amount of, and chaos to the distribution of short steel fiber.Steel fiber reinforced concrete is not only to maintain the advantages of the concrete itself and, more importantly, due to the incorporation of steel fibers, it overcomes some shortcomings, such as the lowed tensile strength of concrete, the lower limit extension, brittleness and so on, it also optimize the concrete matrix, like enhance the intensity, increase in toughness, impede crack and so on.Steel fiber reinforced concrete is widely used in construction, road and bridge and hydraulic engineering. Concrete researchers at home and abroad have done a lot of research on the mechanism of steel fiber, are generally believed that, the short steel fiber’s main role is to hinder the expansion of micro-cracks and to block the occurrence and development of macro-cracks inside the concrete, thereby increasing the matrix cracking strength and impact resistance, and proving the toughness of concrete and the ductility of the concrete structures.Therefor, the steel fiber reinforced concrete is more excellent than ordinary concrete, with a superior physical and mechanical properties. Then, the aspect ratio, volume ratio, and geometry of steel fiber are important parameters to determine the performance of steel fiber reinforced concrete.We use XRD, SEM and other modern physical and chemical analysis to study the hydrothermal synthesis process, the type of hydration product as well as the morphology and structural characteristics, and analysis of the relationship between microstructure and macroscopic mechanical properties. Numerical simulation has lots of advantages, so it is a very important method for studying penetration problem. Numerical simulation could reproduce every details of penetration and gained the data which is not got in penetration test. In the paper, numerical simulations of Ultra-high strength of steel fiber concrete anti-penetration are conducted by ANSYS/LS-DYNA. Residual velocities gained by the method are consistent with the results of test and the damage and failure modes of the targets are like with the tests, too. This indicates numerical simulation is an economical and effective method for penetration problem.