To study the behind armor ballistic trauma (BABT), a finite element model of human torsohas been developed based on the CT data of a Chinese adult man. The model consists oforgans system (heart, lungs, liver and stomach), skeleton system (sternum, costicartilage,ribs and spine), mediastinum and skin. The experiments of rifle bullet penetratingceramic/ultrahigh molecular weight polyethylene (UHMWPE) laminate composite bodyarmor combined with soft body armor were conducted to verify the accuracy of thenumerical model. The skeletal structure was assumed to be linear-elastic while all internalorgans were modeled as viscoelastic. The impact responses of armor covered human torsounder the penetration of rifle bullet at different impact point were conducted numerically.The pressure time histories of heart, lung, liver, stomach were obtained. Furthermore, thecontours of von Mises stress in the skin, thoracic cage and internal organs were alsoanalyzed. The numeric model provides an effective method to study internal organ injuriesand design better vests under non-penetrating ballistic impact.
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