Device For Bone Composite Target Penetration Effect Study Of Numerical Simulation And Mechanical Response

The ballistic wounds of bones are different from other biological structures, because the bone has unique structure and mechanical properties. Currently, the direct wounds of bones have been discussed in many literatures, but the study of indirect wounds hasn’t been researched. In order to study the indirect wounds of bones, the composite bone target model which consisted of the fresh bone and the gelatin wrapping the bone was built. Based on the nonlinear calculation, the dynamic process of9mm bullet penetrating into the composite target was simulated to study the indirect damages of bones, and the mechanical responses of the bone was also analyzed. The main contents were as follow:(1) Based on the images from CT scans, the finite element model of the fresh bone with anisotropy and inhomogeneity was established by Mimics and Hypermesh.(2) The overall FE model of9mm bullet penetrating into the composite target was built. The calculation results by LS-DYNA were compared with the experimental data, and the accuracy of overall FE model was proved.(3) According to the calculative results, the main mechanism of indirect injury on the bone was analyzed. The conclusion that pressure wave is the main reason of indirect wounds was proved.(4) Based on the nonlinear calculation, the influence of the bullet velocity, striking nutation angle and the location of the bone in the gelatin on the mechanical responses of the bones were analyzed.In this paper, studying the mechanical responses on bones and the mechanism of indirect injury by numerical simulation provides the scientific reference for analyzing the indirect wounds of the bone.