Ballistic Performance Of Multi-layered Laminate Targets Subjected To High-velocity Impact

A certain type of fluid dynamics experiment needs to be carried out in explosive container.During the experiment,a large number of high-speed small-mass fragments will be generated,which poses a great threat to the test window opened on the wall of the explosive container.The existing window protection structure is multi-layered spaced aluminium plate,which can effectively prevent the penetration of fragments,but its higher surface density has a greater impact on the imaging accuracy of the X flash test.Therefore,a new window protection structure needs to be designed to meet the experimental safety requirements and physical testing requirements.In this paper,based on the existing window protection structure,ultra-high molecular weight polyethylene(UHMWPE)material is introduced to form the multi-layered aluminium and fibre composite protection structure,and experimental and numerical simulation studies are conducted on its anti-penetration properties.Multi-layered structures have been widely used in defence,marine,aerospace and automotive engineering.It is radical to comprehend the dynamic response of such structures under impact loadings and to design optimal structures to resist ballistic penetration.In this study,high-velocity projectile impact experiments are conducted to explore the penetration resistance of spaced multi-layered aluminium and UHMWPE fibre laminate targets.Experimental results including crater diameter,depth of penetration(DOP)and energy absorption capacity of multi-layered targets are measured then discussed,from which it is evident that the combined use of aluminium and UHMWPE fibre laminates is the most effective in resisting projectile impact considering both the dynamic performance and light weight.Then,simulation models of multi-layered targets subjected the high-velocity fragment impact are built via software ANSYS/LS-DYNA.Through the comparison of numerical and experimental results,the validation of the model is verified.Based on the verified simulation models,further parametric studies are conducted to investigate the fragment shape on the ballistic performance of Multi-layered aluminium targets.The results show that:the penetration ability of fragments listed in order are spherical,cubic,and cylinder;And the multi-layered targets stacked have better performance than spaced,regarding the depth of penetration.Finally,the effect of air space between adjacent layers,number and order of layers on the ballistic performance of multi-layered aluminium and UHMWPE fibre laminate targets are numerical simulated.The results show that:With the width of space increasing,the penetration of the target increased synchronously and to a constant value;When the total thickness of targets set constant,the increasing of the layering number decreased the penetration resistance of multi-layered targets;As the design of the multi-layered targets,putting laminates with comparatively high strength and hardness on the impact face is the most effective configuration in the improvement of anti-penetration performance...