Research On The Shock Resistance Of Magnetite Concrete

Magnetite concrete is widely used in large radiation protection construction. Its shock resistance is closely related to the environment and the safety of person. The thesis is studied by numerical simulation and test data analysis. The objective is to study the shock resistance of magnetite concrete.Through magnetite concrete beam under the action of gravity drop hammer impact dynamic bending test, reasonable testing program was designed to realize the whole process of dynamic test data acquisition, beam load and impulse, time history curves of displacement and force dynamic force- displacement curve and dynamic strain of fracture zone curve.By observing the damage fracture process and the failure pattern under different strain rate, the relationship between the dynamic constitutive relation along with the loading rate and input energy changing has been studied.The influence of impact contact stiffness on the result of experimental results has been studied by changing the loading point of contact, such as gasket, hammer head material and other factors.The finite element method(FEM) is employed to imitate the test process. Simulation results with experimental results is detailedly compared to explain the mechanism of rate related effect.