In the present study, a three-dimensional finite element model of the bullet impact composite laminates is proposed. The user material subroutine VUMAT is used in the proposed three-dimensional model. The failure of composite laminates under different impact energies is analyzed, and the progressive failure process of the composite laminates is further analyzed to predict the failure strength of composite laminates. Then, based on this method, a three-dimensional finite element model of bolted joint composite laminates under low-velocity impact is established. The effects of bullet impact on the bolted joint composite laminates under different boundary conditions are analyzed, and the failure characteristics of the composite structures are investigated when the bullets impacted different positions.

在本研究中，提出了子弹冲击复合材料层板的三维有限元模型。在建议的三维模型中使用了用户资料子例程VUMAT。分析了复合材料层压板在不同冲击能量下的破坏，并进一步分析了复合材料层压板的渐进破坏过程，以预测复合材料层压板的破坏强度。然后，基于该方法，建立了低速冲击下螺栓连接复合材料层板的三维有限元模型。分析了子弹撞击在不同边界条件下对螺栓连接复合材料层合板的影响，研究了子弹撞击不同位置时复合结构的破坏特性。