纤维金属层板低速冲击仿真

采用Johnson-Cook模型模拟铝层的力学行为，选用Hashin三维准则对复合材料层内损伤进行判断，采用Camanho-Matthews折减方案进行刚度折减，同时采用粘接元描述复合层板层间失效，采用Abaqus/Explicit结合VUMAT建立玻璃纤维增强铝合金层板冲击有限元模型。结果表明：随着冲击能量的变大，测量点的位移逐渐变大，钢球反弹后的测量点最大塑性变形也逐渐增大；纤维金属层板的玻璃纤维先发生破坏，然后铝合金层出现裂纹；2种层板的抗低速冲击性能基本相同。研究结果可用于玻璃纤维铝合金层板抗冲击性能的对比分析。

Simulation on low velocity impact of fiber metal laminates

The mechanical behavior of aluminum layer is simulated by Johnson-Cook model. The Hashin 3D criterion is used to judge the inner-layer damage of composite material layer. The Camanho-Matthews reduction scheme is used to reduce the stiffness, and the mortar element is used to describe the inter-layer failure of the composite laminates. The finite element model of the impact on the glass fiber reinforced aluminum alloy laminates is established by combining Abaqus/Explicit with VUMAT. The results show: with the increase of the impact energy, the displacement of the measuring point increases gradually, and the maximum plastic deformation of the measuring point increases gradually after the rebound of the steel ball; the glass fiber of fiber metal laminates is destroyed firstly, then the aluminum alloy layer cracks. The low velocity impact resistance of the 2 laminates is almost equal. The study results can be used for the comparative analysis of impact resistance of glass fiber reinforced aluminum laminates.