SiC/Al双连通复合装甲材料抗侵彻性能宏–微观跨尺度模拟

Multi-scale Simulation of Interpenetrating SiC/Al Composite Armor Materials Subjected to Impact Loading Using a Macro-micro Approach

SiC/Al双连通复合装甲材料所具有的复杂三维微结构特征对其宏观抗侵彻性能具有重要影响。本文建立了从宏观靶试模型中SiC/Al靶板的典型微区提取动态边界条件,并作用于相应微观组织模型的跨尺度数值模拟方法,研究了SiC/Al靶板在抗侵彻过程中不同典型局部微区内的动态微结构损伤及失效过程。研究表明:在弹着点正下方位置,多个裂纹源萌生于两相界面处靠近陶瓷相一侧,随后沿与弹道平行的方向扩展并形成轴向主裂纹;在与弹体轴线呈45°位置,裂纹除了在靠近界面处的陶瓷相一侧萌生外,在陶瓷相内部也出现了与弹道方向垂直的多条水平裂纹,界面裂纹与水平裂纹进一步扩展并桥连成多个锥形主裂纹。相关模拟方法为将来该类材料的微结构优化提供了一种新的技术途径。

Since the macro anti-penetration performance of interpenetrating SiC/Al composite is controlled mainly by the complex three-dimensional microstructure features. Muti-scale simulation of SiC/Al composite under impact loading was performed by using a macro-micro method. The simulation for macro SiC/Al composite armor plate under impact loading was employed first,then the dynamic boundary conditions from the typical local regions in SiC/Al composite were obtained and applied on its microstructural finite element model as a loading condition to analyze the dynamic damage and failure process in the typical local regions. The results revealed that,in the local region right below the impact point,the cracks initiated mainly near the SiC/Al interface,just on the side of the SiC ceramic phase,then continuously propagated parallel to the direction of the bullet axis and eventually converged together to form axial main cracks. Meanwhile,in the region at a 45o angle to the direction of bullet axis,the cracks initiated not only near the SiC/Al interface but also inside the ceramic phase. Subsequently,these cracks propagated,bridged and finally formed cone main cracks. This simulation method provides a feasible technical approach for microstructure topology optimization of the material.