| Popis: |
The work presents a numerical procedure employed for the simulation of high-velocity impact phenomena at Weldox 460 E steel plates. Parameters which affect the plate impact resistance have been analyzed in this work. These include projectile nose shape, impact velocity and incidence angle, and the target plate thickness and configuration. The impact velocities are in the range of 75 to 550 m/s, whereas the mass of the impactor is approximately 0.2 kg. The thickness of the stationary target plates has been varied from 10 to 20 mm. The simulations have been performed in Abaqus/Explicit as to employ the broad range of available material models and due to the robustness of the simulation in highly nonlinear transient problems, where complex contact conditions are present. The Johnson-Cook strain rate dependent plasticity model has been employed to realistically simulate the impact behavior of the target plate. Additionally, a Continuum Damage Mechanics model has been employed as to model the damage processes in the material. According to this model, damage effects are triggered based on the value of equivalent plastic strain in the material. Plate perforation has been simulated using the element deletion criterion based on the damage parameter. The material parameters of the constitutive model have been determined from the literature and by validation against the experimental ballistic curves available in the literature. The numerical simulations have correctly replicated the available experimental results, thereby confirming the validity of the numerical procedure and the employed material constitutive laws, as well as degradation and failure models. |
