Optimization Analysis Of Fragments For Flexible Protective Armor Based On Bionic Mechanism

In recent years,with the development of military science and technology in various countries,military warfare is developing towards electronic information warfare from the cold age to the hot weapon age,and then to the present age.With the diversification of operations,the power of bullets has also been significantly improved.Various factors make the modern protective armor not only need higher requirements of bullet-proof,but also make it comfortable,portable and easy to fight.In this paper,a new type of protective armor with sufficient protective performance and flexible deformation requirements is designed by referring to the multi-level structure and unique overlapping mode of the scales of grass carp,crucian carp and carp.In this paper,based on bionics,combined with composite materials research means,the protective equipment has better ballistic protection and flexible deformation ability,thus referring to the combat effectiveness of individual combat,increase the wearer's comfort.By bionic design,single composite scale optimization design,simulation analysis of overall performance of protective equipment and ballistic limit test verification,the ballistic capability of protective equipment is systematically analyzed,which provides a new idea for the design of individual protective armor in China.Related research and results are as follows:According to the bionic idea,the mathematical formula of single scale size is obtained by theoretical calculation of mathematical formula,and the adjacent relationship and position coordinates between multiple scales are further established.Finally,the theoretical geometric model of the whole protective equi pment is obtained.Combined with MATLAB and ANSYS / LS-DYNA,the finite element model of flexible bionic protective armor can be established quickly and accurately by theoretical coordinate analysis.The performance of various common protective materials is compared and analyzed to provide the best combination for the selection of protective equipment materials.According to the level II of fragment resistance in military standard of “Requirements of safety technical performance for military body armor(GJB 4300A-2012)”,the ballistic penetration simulation of the flexible bionic protective armor with finite element model was carried out by using 17-grain fragments.By optimizing the coverage rate and arc radius of a single composite scale,the optimal overlapping mode is obtained,which can improve the dynamic impact performance of the protective equipment.Based on the optimized coverage and arc radius,the finite element model of the flexible protective equipment is established.The critical breaking velocity and breaking kinetic energy of the protective equipment are obtained by penetrating the protective equipment with 17-grain fragments with different initial velocities.According to the level II of fragment resistance in military standard of “Requirements of safety technical performance for military body armor(GJB 4300A-2012)”,2,17 and 64 grain are simulated and analyzed according to the corresponding penetration speed to verify whether the protective equipment meets the requirements of the protection standard.According to the simulation analysis model,the finished product of flexible bionic protective equipment is prepared,and the anti-fragment ballistic limit test and analysis are carried out.The accuracy of simulation analysis and the dynamic impact performance of the protective equipment are further verified by the test.