Reinforcement Structure Design And Analysis For Bionic Ballistic Armour Inspired By The Ark Shell’s Shells And Mantis Shrimp’s Dactyl Clubs

Firearms are widely used in the battlefield,and with the development of science and production technology,the power of firearms is constantly improved,and the danger to human body in the war is getting severer and severer.In order to protect human lives,there are higher requirements for the protective performance of wearable protective equipment.At present,people develop new high-performance fiber materials such as aramid fiber,ultra-high-molecular-weight polyethylene fiber,because compared with traditional materials,has the advantages of lighter quality and higher strength,so the main body of high-performance fiber composite materials for wearable protective equipment has become the main research object of each country.However,due to the limitations of material performance,production costs,in improving the performance of protective equipment need to explore new ideas to bring new ways to improve the performance of protective equipment.In nature,there is fierce competition among various organisms,and in the long term competition and complex survival environment,some organisms have evolved amazing mechanical properties.For organisms,due to the natural limitations of biological raw materials,organisms have evolved a series of special structures to meet the needs of activities such as predation,defense,and competition over a long period of time,resulting in different excellent functions to achieve an advantage in natural competition.The characteristics of these organisms to adapt to the harsh survival environment and human protective equipment performance needs have similarities,so it is possible to improve the protective ability of wearable protective equipment by drawing on the structural strengthening methods and functions of biological materials,without using complex raw materials.Inspired by the structural characteristics and arrangement of the shells from ark shell,Scapharca subcrenata,and the dactyl clubs from Peacock Mantis shrimp,Odontodactylus scyllarus,this paper designs the bionic strengthening structure,and conducts the actual projectile penetration test.Analysis and improvement of the shortcomings of the bionic reinforced structure through finite element simulation The main points of the study are as follows.(1)Biological characterization of the shells from ark shell.The analysis of the macroscopic morphology,microscopic cross-sectional structure,material composition,and microscopic mechanical properties of the shells from ark shell was conducted to determine the enhancement of the mechanical properties of the shells from ark shell.The micromechanical properties and cross-sectional structure of the radiating ribs of the shells from ark shell were used to determine the role of the radiating ribs and the serrated structure in crack induction during the damage of the ark shell.(2)Biomimetic strengthening structure design.A bionic reinforced structure was designed by the shells from ark shell with the dactyl clubs from Peacock Mantis shrimp and analyzing the characteristics of the structural strengthening methods and mechanical property changes of the two biological materials.In view of the shortcomings of the bionic reinforced structure in the actual projectile penetration test,the reinforced structures applicable to ballistic helmet,ballistic insert ceramic,and ballistic insert were designed according to the specific ballistic protection equipment.(3)Finite element simulation analysis.The actual projectile penetration test was simulated by establishing a finite element model,and the validity of the finite element model was determined based on the test results.The designed reinforced structure was analysed for its penetration resistance under high speed impact,and the reinforced structure was evaluated by the projectile velocity-time image during the projectile impact,the deformation of the target plate under the projectile impact and the breakage of the target plate material.The maximum displacement of the fibre layer in the raised and grooved positions of the target plate(A2)is 40.09% and 46.62% less than the maximum displacement of the fibre layer on the back of the target plate without structure,but the ultimate protection against high-speed projectiles is weakened;the designed crack induction structure on the ballistic ceramic can change the volume of the damage cone of the ballistic ceramic during the impact of the projectile and increase the energy consumption of the ceramic fragments against the projectile.The maximum displacement of the fibre layer on the back of the bullet-proof surface of target plate B2(fibre plate thickness 10 mm,ceramic thickness 10 mm,ceramic crack induction structure size 2 mm×2 mm rectangle,90° crossed arrangement,crack induction structure spacing 30 mm)is reduced by 31.31% compared with the unstructured target plate,but the protection ability at the intersection of the crack induction structure is weak;change the overall structure of bullet-proof insert plate,target plate C3(fibre plate thickness The maximum displacement of the fibre layer in the raised and grooved positions of target plate C3(fibre plate thickness 10 mm,fibre plate mid-arc dimension height a 10 mm,span b 50 mm,ceramic thickness 10 mm)is reduced by 24.83% and23.26% compared with the maximum displacement of the fibre layer on the back side of the unstructured target plate.