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Biomechanical modeling for the response of human thorax to blast waves

Acta Mechanica Sinica 2015年第4期31卷 589-598页

作者： Jie Zhou Gang Tao School of Energy and Power Engineering Nanjing University of Science and Technology

A simplified finite element model of a human thorax had been developed for probing into the mechani- cal response in simple and complex blast environments. The human thorax model was first created by CT images with blast loading applied via a coupled arbitrary Lagrangian- Eulerian method, allowing for a variety of loads to be considered. The goal is to analyze the maximum stress distri- butions of lung tissue and peak inward thorax wall velocity and to know the possible regions and levels of lung injury. In parallel, a mathematical model has been modified from the Lobdell model to investigate the detailed percentage of lung injury at each level. The blast loadings around the human tho- rax were obtained from the finite element model, and were then applied in the mathematical model as the boundary con- ditions to predict the normalized work of the human thorax lung. The present results are found in agreement with the modified Bowen curves and the results predicted by Axels- son＇s model.

关键词： Biomechanical model human thorax Blastwaves Stress wave Normalized work- Blast lung injury

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

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Chinese Journal of Traumatology 2020年第5期23卷 258-264页

作者： Yuan-Yuan Ju Lei Zhang Di-Ke Ruan Cheng Xu Ming Hu Ren-Rong Long Naval Research Academy of PLA Beijing 100161China The Sixth Medical Center of Chinese PLA General Hospital Beijing 100048China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

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

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A numerical simulation method on injury of natural fragments to human thorax

A numerical simulation method on injury of natural fragments...

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中国力学大会（CCTAM2019）

作者： Yuanyuan Ju Lei Zhang Haiyan Liu Renrong Long Dike Ruan Naval Research Academy of PLA State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology The Sixth Medical Center of Chinese PLA General Hospital

Objective: Fragment injury as a kind of blast injury is becoming more common in military campaigns and terrorist attacks. The numerical simulation method on the formation of natural fragments and its injury to the biological target are expected to be developed. Methods: A cylindrical warhead model was established and the formation process of natural fragments was simulated by using the approach of tied nodes with failure through the explicit finite element(FE) software of LS-DYNA. The interaction between detonation product and warhead shell was simulated by the Fluid-Structure Interaction(FSI) algorithm. A method of simulating the injury of natural fragments to biological target was presented by transforming Lagrange elements into Smooth Particle Hydrodynamics(SPH) particles after the natural fragments formed finally. The computational model of 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 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 while slowly after the warhead shell fractured. The initial velocities of natural fragments at the central part of the warhead shell were the largest, while those at both ends of the warhead shell were the smallest. The natural fragments resulted in bullet holes which were the same as the fragments in shape while larger a little than the fragments in size in human thorax after they penetrated through. The stress waves propagated in the ribs enhanced the injury to soft tissue, and the ballistic pressure waves ahead of natural fragments were also an injury factor to soft tissue. Conclusions: The present method on simulating the formation of natural fragments and its injury to biological target was effective. The method will be helpful for simulating the combined injury of natural fragments and shock wave to biological targe

关键词： numerical simulation fragment injury natural fragments human thorax Fluid-Structure Interaction（FSI） Smooth Particle Hydrodynamics（SPH）

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