Optimal Design And Experimental Study Of Flexible Protective Equipment Inspired By Bionic Principle

Based on the research mechanism of bionics,through the research and analysis of the geometric characteristics and microstructure of biological materials,the design of light,flexible,and high-performance protective equipment has become a new direction for the development of personal protective armor In this paper,we obtain design inspiration from biomaterials,draw lessons from the superimposed coverage mode of pangolin scales,design and prepare a bionic protective device for limbs with both protective performance and flexible deformation to effectively protect the human limbs;At the same time,in order to solve the problem of insufficient anti-multiple penetration ability of a single bulletproof board,a special-shaped bulletproof ceramic with an inclined side on the side was designed,and a new type of inlaid bulletproof board was constructed by plane splicing.The research content of this article mainly includes the design,simulation and preparation test of protective equipment.It has certain reference value for the research of individual protective equipment.The specific research content is as follows:(1)Draw lessons from the geometric characteristics and microstructure of biomaterials,study the pattern of pangolin scale overlay and the design principle of the interlocking structure of biomaterials,and design a kind of extremity protective equipment covered by elliptical bionic scales and bulletproof inlaid with special-shaped ceramics.Flapper.By comparing and analyzing the mechanical properties of bulletproof materials,it is determined that the limb protective equipment uses UHMWPE laminate as the bionic scales,the bulletproof inserts uses the special-shaped Si C ceramic as the hard protective layer,and the two sets of protective equipment are designed with UHMWPE non-woven fabric as the soft protective underlayment.,Acting as a flexible backboard support,and finally proposed a new type of bionic protective gear geometric model about the human limbs and torso.(2)The protective equipment specimens were prepared according to the designed geometric model,and the trajectory limit V50 and V0 tests were carried out on the limb protective equipment and the bulletproof board according to the "Military Body Armor Safety Technical Performance Requirements"(GJB 4300A-2012)level II protection standard.The test results show that the limb protective equipment can effectively resist the penetration of 17-grain fragments,and the measured V50 value reaches 862 m/s.The scale stack design effectively reduces the penetration damage range of the fragments and meets the requirements of protection standards.In order to compare the effect of ceramic tilt angle on the protection performance,bulletproof inserts with ceramic tilt angles of 0° and 9° were prepared for penetration test of7.62 mm pistol bullets.The initial firing speed of the pistol was 420 m/s ±10 m/ s.The test results show that the ceramic tilt angle design reduces the overall depression depth of the bulletproof insert and the number of damage to the cushion,which effectively improves the protection performance of bulletproof inserts and can meet the requirements of protection standards.The flexible deformation test of the protective gear by the MTS universal testing machine found that when the load reaches 100 N,the vertical deformation of the limb protective gear reaches 11 mm,while the deformability of the inlaid bulletproof insert is weak,and the vertical deformation only reaches 8 mm.(3)Establish a theoretical model of protective equipment through LS-DYNA simulation analysis software for impact simulation.According to the GJB 4300A-2012 level Ⅱ protection standard,17 and 64 grains are used to simulate fragments to penetrate the extremity protective equipment;at the same time,7.62 mm pistol shells are used to penetrate the ballistic plate.The simulation results show that the two types of protective equipment can effectively resist the damage of the projectile,reaching GJB 4300A-2012 level Ⅱ protection level.Analyze the damage characteristics of the protective equipment based on the simulation results: including the staged failure process of the protective equipment,stress distribution,scale synergy,deformation of the protective equipment,parameter optimization design,etc.According to the simulation results,as the tilt angle of the ceramic increases,the protective performance of the bulletproof inserts first increases and then decreases.When the tilt angle of the ceramic is 6°-9°,it has better protective performance.