| Popis: |
This paper presents a lightweight armor structure calibration method. The armor consists of a stacking of two materials: a ceramic tile and a backing made of UHMWPE (Ultra High Molecular Weight Polyethylene) plate. Using a building block approach, each material is characterized separately before studying the response of the resulted structure under ballistic impact. For the ceramic material, Hugoniot and spall parameters are identified using plate impact tests. Then, data from dynamic confined compression tests on SHPB (Split Hopkinson Pressure Bars) are used to complete the model. The characterization of the composite backing is realized using a dynamic press (tension), SHPB (out-of-plane compression) and gas gun (out-of-plane shear). The out-of-plane shear configuration test has been specifically designed to highlight the behavior of the composite material. Experimental data are used to calibrate a non-linear orthotropic material model with damage for the composite plate and a JH-2 material model for the ceramic. Moreover, the modelling of inter-ply interaction appears to be predominant to correctly reproduce the ballistic behavior of UHMWPE. The model of each material has been validated in a ballistic test configuration using a sphere for the composite and a rod projectile for the ceramic. Additional tests were conducted to study the ballistic response of the stacking (ceramic tile + UHMWPE) with a more realistic 7.62mm projectile |
