Research On The Bludgeoning Effect Of Bullets On Human Simulated Targets With Bulletproof Helmets

With the advent of new bulletproof materials,bulletproof helmets have greatly increased the probability of soldiers surviving on the battlefield.However,due to the limitation of the bearing capacity of human head,the bulletproof ability of helmets can only protect from fragments and pistol bullets but not reach the high-grade bulletproof clothing’s bulletproof ability.The transient bulge generated from hitting can cause the damage of human head easily.Experimental research combined with numerical simulation method were used in this paper.To explore the head injury caused by pistol bullets,this paper analyzed the various physical mechanism when the pistol bullet hit a protected human head simulated target and caused the blunt injury.The result provided an important reference and a complete test method for the blunt impact of pistol bullets study.The main work and research results of this thesis were as follows:Firstly,a set of test methods suitable for the process of bullets penetrating the helmet was proposed.The deformation process of the helmet was collected by the 3DDIC technology.The pressure and acceleration change of the simulated target was obtained by the inside senor.This test method can solve the problem that the penetration process changed rapidly and the helmet geometry was particularly difficult to measure.Using the above test method,the process of bullets penetrating the simulated head target with a bullet-proof helmet was studied,and various physical results of the blunt process were obtained.The results showed that there was a difference between the internal and external deformation of the helmet,which caused by the penetration of the bullet.To study the difference,a further test for the helmet inner drum based on 3DDIC was conducted.Secondly,the blunt process was simulated by FE method,based on the experiment process.The mechanical response of the simulated head target,the head damage degree and the process of energy transfer can be understood intuitively by the experiment research and numerical simulation.In the end,the head damage degree during the bullet’s penetration process was evaluated by the combination of existing evaluation methods and test data.It provided guidance for improving the lethality of light weapons and designing helmets.