Fiber metal laminates have been successfully applied in military aircrafts, armor vehicles and other modern engineering industries as protective structures due to their outstanding impact resistant properties. Prediction of the ballistic performance and investigation on the damage mechanism of the fiber metal laminates under general oblique impact conditions still remain a very challenging issue. In this study, a nonlinear dynamic finite element model in terms of continuum damage mechanics including intra- and inter-layer failure modes is presented. The accuracy of this model is validated with available experimental data. The damage and ballistic performance of two different structural fiber metal laminates subjected to high-velocity oblique impact by rigid hemispherical nose projectile with angles of 0°, 30°, 45° and 60° are studied. The numerical results show that the projectile deflects when the oblique impact occurs and the deflection angle decreases with increasing the impact velocity. The residual velocity of the projectile and the energy absorption of the target are related to the initial impact velocity and impact angle of the projectile. The proposed simulation approach offers a new proper reference for numerical investigations of common oblique impact problems in other fiber metal laminates.

中文翻译：

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高速斜向冲击下纤维金属层压板的弹道性能和损伤模拟

金属纤维层压板由于其优异的抗冲击性能，已成功应用于军用飞机、装甲车辆等现代工程行业作为防护结构。在一般倾斜冲击条件下，预测弹道性能和研究纤维金属层压板的损伤机制仍然是一个非常具有挑战性的问题。在这项研究中，提出了一个包含层内和层间失效模式的连续损伤力学非线性动态有限元模型。该模型的准确性已通过可用的实验数据进行验证。研究了两种不同结构的纤维金属层压板在0°、30°、45°和60°角刚性半球弹头高速斜向冲击下的损伤和弹道性能。数值结果表明，当发生斜向撞击时，弹丸发生偏转，偏转角随着撞击速度的增加而减小。弹丸的残余速度和目标的能量吸收与弹丸的初始撞击速度和撞击角度有关。所提出的模拟方法为其他纤维金属层压板中常见斜向冲击问题的数值研究提供了新的适当参考。