目的 预测金属玻璃复合材料长杆弹在不同撞击速度下的侵彻/穿甲性能，为优化弹体撞击速度和弹体头部形状等提供理论指导。方法 结合相关侵彻试验，基于细观有限元建模及修正的热力耦合本构模型，开展了钨纤维增强金属玻璃复合材料长杆弹在不同速度下侵彻钢靶的有限元模拟，分析了不同速度下复合材料弹体破坏模式的差异，讨论了撞击速度对复合材料弹体头部形状变化影响规律及其内在机理。结果 低速撞击条件下，复合材料长杆弹体头部的钨纤维发生剧烈的屈曲弯折变形，弯折钨纤维堆积在头部，形成较厚的“边缘层”，且存在1~2条剪切带，弹体头部表现为“细长尖卵”形状;随着撞击速度逐渐增加，弹体头部钨纤维的弯折变形程度逐渐有所降低，“边缘层”厚度也有所减小，且外侧钨纤维开始发生屈曲回流，头形逐渐转变为“短粗尖卵”形状，且尖锐程度随撞击速度增加而降低;在高速撞击条件下，弹体头部“边缘层”显著变薄，同时最外侧钨纤维发生屈曲回流，弹体头部表现为“扁平”形状。结论 撞击速度对复合材料弹体的头部变形及破坏特征具有重要影响。随着速度增加，复合材料弹体头部形状逐渐从“细长尖卵”转变到“短粗尖卵”，最后变为“扁平”。

The work aims to predict the penetration / perforation performance of tungsten fiber reinforced metallic glass composite long rods, and provide guidance for optimizing the impact velocity and the rod nose shape. Finite element simulations on the penetration of composite long rods into steel targets at different impact velocities were conducted in combination with the related penetration tests, in which mesoscopic geometric models were established and a modified thermal-mechanical coupling constitutive model was used to describe the mechanical properties of metallic glass matrix, and then the differences in failure modes of composite long rod at different velocities were analyzed. The effect of impact velocity on the nose shape of composite long rods and its internal mechanism were discussed. Related analysis demonstrated that at relatively lower impact velocity, the tungsten fibers within the rod nose underwent severe buckling and bending deformation, and the buckled fibers accumulated on the rod nose and formed a thick edge layer , in which there were 1~2 shear bands, and the rod nose exhibited an "ogive" shape; Along with the increase of impact velocity, the bulking of tungsten fibers in the rod nose became less severe, and the thickness of "edge layer also became thinner gradually. Besides, the tungsten fiber outside also began to flow backward, and thus the sharpness of the "ogive" rod nose decreased gradually; When at a high impact velocity, the tungsten fibers in the rod nose no longer bulked severely, and the edge layer thinner. At the same time, the tungsten fibers outside also flowed backward. Eventually, the rod nose displayed a shape. On the whole, the impact velocity has significant influence on the deformation and failure characteristics of composite rod nose, and along with the increase of impact velocity, the nose shape gradually changes from the shape to the , and eventually to the ” shape.