Numerical simulation of bolted joint composite laminates under low-velocity impact

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.