Yu Hong, Fan Qunbo, Zhu Xinjie
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China.
Materials (Basel). 2020 Sep 2;13(17):3886. doi: 10.3390/ma13173886.
The effect of the layer sequence on the ballistic performance of Ti6Al4V (35 mm)/CP-Ti (5 mm) laminated composite armor, against a 12.7 mm armor piercing projectile, was systematically investigated, both experimentally and computationally. By introducing the Johnson-Cook constitutive model and fracture criterion, the penetrating process of the composite plate was well-simulated. Furthermore, the influence of the layer sequence on the ballistic performance and failure mechanism of the composite plate was evaluated from the perspective of energy absorption and the stress distribution. Numerical simulation results of the macro morphology and penetration depth agreed well with the experimental results. The results showed that the energy absorption histories of each layer and stress distribution of the composite plate were found to be significantly affected by the arrangement sequence. The ballistic performance of Ti6Al4V/CP-Ti was far superior to that of CP-Ti/Ti6Al4V because more energy was absorbed in the early stage of the penetration process, thereby reducing the damage to the rear face. Further studies showed that the first principal stress in both structures was radially distributed in space, but was mainly concentrated at the rear face when the CP-Ti was placed at the front. Therefore, this stress induced cracking and failure in that region and, consequently, lowered the overall ballistic performance.
通过实验和计算，系统研究了层序对Ti6Al4V（35毫米）/纯钛（5毫米）层压复合装甲抗12.7毫米穿甲弹弹道性能的影响。通过引入约翰逊-库克本构模型和断裂准则，很好地模拟了复合板的穿透过程。此外，从能量吸收和应力分布的角度评估了层序对复合板弹道性能和失效机制的影响。复合板宏观形态和穿透深度的数值模拟结果与实验结果吻合良好。结果表明，复合板各层的能量吸收历程和应力分布受排列顺序的影响显著。Ti6Al4V/纯钛的弹道性能远优于纯钛/Ti6Al4V，因为在穿透过程的早期吸收了更多能量，从而减少了对背面的损伤。进一步研究表明，两种结构中的第一主应力在空间上呈径向分布，但当纯钛置于前面时，主要集中在背面。因此，这种应力在该区域引发了裂纹和失效，从而降低了整体弹道性能。
