Building of a Constitutive Model for Concrete under Dynamic Impact

By analyzing both of dynamic behavior and existing constitutive models of concrete, a new constitutive model has been built to simulate dynamic response of concrete. The main factors such as pressure, the third invariant of stress tensor, strain hardening and softening, stain rate and tensile damage have been taken into account in the constitutive model. After calibrating all parameters of the model, simulation of a perforation problem on concrete target has been carried out with the Lagrangian finite element code LTZ-2D. The computed results of residual velocity are well consistent with the test data, and a reasonable figure of fractured concrete target is obtained. Results demonstrated that the built constitutive model could well describe the main characters of concrete under impact loading.