Rolled magnesium alloys exhibit pronounced tension-compression asymmetry as well as anisotropy in yield and strain-hardening behavior. Although differences in the mechanical response are reasonably well-understood, it is not clear to what extent anisotropy alters the deformation and failure of plates subjected to ballistic loading conditions. In this work, the role of texture and anisotropy in the ballistic response is investigated using a combined experimental–computational approach. Sphere impact experiments are performed on rolled magnesium plates cut from orientations that exhibit differing mechanical responses. The complex failure process is characterized by in situ diagnostics, including ultra-high-speed Digital Image Correlation and Photonic Doppler Velocimetry, and compared with simulations performed on polycrystalline aggregates using a polycrystal plasticity model for hcp metals. The anisotropic deformation behavior arises from deformation mechanisms with disparate strength and strain hardening behavior, which is well captured in the model. The occurrence of low-strength extension twinning is shown to govern the initial anisotropic deformation and bulging of the plate. When compared with post-mortem 3D X-ray microscopy, regions that experience intense basal slip are shown to be sites for damage initiation that leads to eventual fracture. The combination of experiments and simulations suggest that at low to intermediate ballistic loading rates, material orientation plays a crucial role in dictating eventual fracture and failure in strongly anisotropic metals such as in rolled magnesium alloys.

轧制镁合金表现出明显的拉伸-压缩不对称性以及屈服和应变硬化行为的各向异性。尽管机械响应的差异已得到很好的理解，但尚不清楚各向异性在多大程度上改变了承受弹道载荷条件的板的变形和破坏。在这项工作中，使用组合的实验 - 计算方法研究了纹理和各向异性在弹道响应中的作用。球体冲击实验是在从表现出不同机械响应的方向切割的轧制镁板上进行的。复杂的故障过程的特点是原位诊断，包括超高速数字图像相关和光子多普勒测速，并与使用 hcp 金属的多晶塑性模型对多晶聚集体进行的模拟进行比较。各向异性变形行为源于具有不同强度和应变硬化行为的变形机制，这在模型中得到了很好的体现。低强度拉伸孪晶的出现控制了板的初始各向异性变形和膨胀。与尸检 3D X 射线显微镜相比，经历强烈基底滑动的区域被证明是导致最终断裂的损伤起始部位。实验和模拟的结合表明，在低到中等弹道载荷率下，