基于防弹衣背面动态变形的钝击伤评估

Blunt Injury Assessment Based on Dynamic Back Face Deformation of Body Armor

为研究在非贯穿侵彻情况下,防弹衣的钝击效应。运用三维数字图像相关技术对SS109步枪弹侵彻NIJ Ⅲ级Si C/UHMWPE防弹衣进行了试验研究,获得了防弹衣背面变形的全场三维数据。并结合粘性准则和简明等级损伤准则讨论了枪弹侵彻防弹衣后胸部的钝性损伤程度。结果表明:防弹衣背面鼓包的形态类似一个圆锥形,在侵彻过程中平均最大鼓包高度为19.2 mm,平均剩余鼓包高度为16 mm,平均最大变形速度为108.7 m/s。根据试验得到的速度和位移数据,计算得到的VC平均值为4.35 m/s,对应的AIS损伤等级为6。

To study the blunt effect of the body armor and the blunt injury degree of human chest under the condition of non-penetrating,3 D-DIC was used to conduct experimental research on SS109 bullets penetrating NIJ Ⅲ level SiC/UHMWPE body armor,and the full-field 3 D data of the back deformation was obtained. The VC and AIS were used to evaluate the degree of blunt injury when body armor at different intervals from the chest. The test results show that the bulge on the back of body armor is similar to a conical shape,the average maximum bulge height is 19. 2 mm,residual bulge height is 16 mm,and maximum deformation velocity is 108. 7 m/s. According to the velocity and displacement data obtained from the test,average VC value is 4. 35 m/s,and AIS is 6.