Dynamic mechanical properties of reinforced concrete subjected to shock loading

One-stage light gas gun is used to study the dynamic mechanical properties of reinforced concrete subjected to shock loading. The material of projectile is the same as of the target. The stress-time curves are recorded by three manganin pressure transducers embedded in the target in advance. The experimental data are analyzed by self-designed program using the path line principle of Lagrangian analysis method. With the stress records, complete histories of particle velocity and strain can be obtained at any point within the gauged regions of the reinforce concrete. The result of experiment indicates that the stress-strain curves of reinforced concrete present stagnant-return properties. And some other dynamic properties can be gained, such as rate dependent, waveform dissipation and so on. Furthermore, Based on the analytical micromechanical method, the dynamic constitutive relation of reinforced is declared to multiply the viscoelastic constitutive relationship of concrete by a constant G on the assumption that the damage occurred only in the concrete. The prediction agrees with the experimental data.