Study On The Penetration Of Cemented Carbide Fragments Into UHMWPE Fiber Laminate

UHMWPE(Ultra-High Molecular Weight Polyethylene)fiber,as a new generation of high-strength,high-modulus fiber,significantly improves the protection level of individual soldiers,and the use of cemented carbide as the penetrating body material can improve the armor penetration and lethality of the weapon.In order to study the ballistic limit,deformation process and anti-penetration characteristics of UHMWPE fiber laminate under the impact of cemented carbide fragments,this paper takes the penetration process of cemented carbide fragments into UHMWPE fiber laminate as the research background.Through numerical simulation,experiment,Three methods of theoretical analysis were studied,and the macromicro multi-scale finite element model and energy analysis model of fragments penetrating the fiber laminate were established.A test of 1.5 g cemented carbide fragments penetrating an11 mm thick UHMWPE fiber laminate was carried out to verify the correctness of the finite element model and the energy analysis model.Numerical simulation and energy analysis model are used to calculate the penetration of fragments at different incident velocities(300 m/s – 1100 m/s)into the laminate(target board),and conclusions are drawn: 1)During the penetration process,the bulging deformation range on the back of the target board is "Square" distribution,the range of layered damage first increases and then decreases in the trajectory direction.The velocity of the bulge is positively correlated with the fragment velocity,and the fitting coefficient is 0.335-0.395;2)Hard The penetration ability of high-quality alloy fragments is 23.67 % higher than that of steel fragments of the same quality,and 36.72 % higher than that of steel fragments of the same volume;3)The target plate has four energies: compression deformation,shear failure,delamination failure,and tensile deformation during the penetration process.Mainly assimilation mechanism.Any damage mechanism in the target plate is the result of the superposition of multiple factors,and the dominant position of various factors in different damage mechanisms is different;4)When the incident velocity of the fragments is less than the ballistic limit,the target plate will be compressed and deformed and sheared.When the incident velocity of fragments is greater than the trajectory limit,the target is mainly absorbed by shear failure,tensile deformation and delamination failure;as the incident velocity increases,the main failure mode of the target is compression deformation And shear failure transforms to tensile deformation and delamination failure.