Numerical study on impulsive local damage of reinforced concrete structures by a sophisticated constitutive and failure model

摘要

This study offers a new constitutive and failure model for the concrete which covers a wide range of the impact phenomena. The authors extended the static non-uniform hardening plasticity model developed by Han and Chen, mainly to the high strain rate region. The model, called 'Dynamic Drucker-Prager CAP Model', was implemented in a hydrocode AUTODYN~(TM) through the subroutines which are open to the user. Then, a number of numerical analyses were carried out by using the material mode, which simulate the impact tests on reinforced concrete structures by the aircraft. In the experiment, the engine was modeled by a rigid or a deformable missile on three scales: full, 1/2.5 and 1.7.5. The penetration, perforation and scabbing modes of the reinforced concrete were numerically simulated in good agreement with the experiment. The numerical results were discussed over the comparison with the Degen's damage equation.