Anti-penetrating Property of 3-D Four-step Braided Composites——Comparison between Experimental Quasi-static Penetration and FEM Simulated Ballistic Penetration

Our study aims at the feasibility of obtaining ballistic impact penetration property of three-dimensional four-step braided Twaron /epoxy composite from quasi-static penetration test results. The quasi-static penetration test was conducted at MTS using a steel conically-cylindral indentor to obtain the penetration load-displacement curve and penetration work-displacement curve. From the observation of damage region of composite by SEM, it was found that the tensile failure is the main failure mode, also combined with little compressive damage and shear damage on the penetration surface. Because of the difficulty of measuring the change of penetration work during the ballistic impact penetration, commercially available finite element analysis code LS-DYNA960 is incorporated with the mechanical property of three-dimensional braided composite and the failure mode from quasi-static penetration to simulate the ballistic impact response From the comparison of penetration work-displacement relationship, it is proven that we could obtain ballistic penetration property from quasi-static penetration test with high precision.