A numerical simulation method of natural fragment formation and injury to human thorax  

作　　者：Yuan-Yuan Ju Lei Zhang Di-Ke Ruan Cheng Xu Ming Hu Ren-Rong Long 

机构地区：[1]Naval Research Academy of PLA,Beijing 100161,China [2]The Sixth Medical Center of Chinese PLA General Hospital,Beijing 100048,China [3]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Chinese Journal of Traumatology》2020年第5期258-264,共7页中华创伤杂志（英文版）

基　　金：The work was funded by the National Science Foundation for Young Scientists of China(11902356);China Postdoctoral Science Foundation(2018M633715);Innovation and Cultivation Fund of the Sixth Medical Center of PLA General Hospital(No.CXPY201825);the Army Scientific Research(LB20182D040012).

摘　　要：Objective:Fragment injury is a type of blast injury that is becoming more and more common in military campaigns and terrorist attacks.Numerical simulation methods investigating the formation of natural fragments and injuries to biological targets are expected to be developed.Methods:A cylindrical warhead model was established and the formation process of natural fragments was simulated using the approach of tied nodes with failure through the explicit finite element(FE)software of LS-DYNA.The interaction between the detonation product and the warhead shell was simulated using the fluidestructure interaction algorithm.A method to simulate the injury of natural fragments to a biological target was presented by transforming Lagrange elements into smooth particle hydrodynamics(SPH)particles after the natural fragments were successfully formed.A computational model of the human thorax was established to simulate the injury induced by natural fragments by the node-to-surface contact algorithm with erosion.Results:The discontinuous velocities of the warhead shell at different locations resulted in the formation of natural fragments with different sizes.The velocities of natural fragments increased rapidly at the initial stage and slowly after the warhead shell fractured.The initial velocities of natural fragments at the central part of the warhead shell were the largest,whereas those at both ends of the warhead shell were the smallest.The natural fragments resulted in bullet holes that were of the same shape as that of the fragments but slightly larger in size than the fragments in the human thorax after they penetrated through.Stress waves propagated in the ribs and enhanced the injury to soft tissues;additionally,ballistic pressure waves ahead of the natural fragments were also an injury factor to the soft tissues.Conclusion:The proposed method is effective in simulating the formation of natural fragments and their injury to biological targets.Moreover,this method will be beneficial for simulating the combined injurie

关 键 词：Finite element analysis Fragment injury Human thorax Fluidestructure interaction Smooth particle hydrodynamics 

分 类 号：R826[医药卫生—临床医学]