Numerical failure simulation of bolt-loaded composite laminate

Based on the 2D model, the user subroutine USFLD has been programmed for ABAQUS to simulate the damage evaluation in the composite laminate. The numerical results show that the present method can predict the bear strength and demonstrate the failure mode of the bolt-loaded laminate very well. After analyzing the results, as for the cross-ply laminate, the shear non-linearity effect is not evident, both the non-linear analysis and the linear analysis can he applied to predict the strength and the failure mode of the cross-ply laminate, but as for the angle-ply laminate, the difference between the above two methods is very large, and the non-linear analysis is more fit for this laminate. The clearance between the bolt and the hole affects the ultimate strength of the laminate to a great extent. The bear strength decreases with the clearance increasing. At the same time, the clearance can affect the distribution and degree of damage in the bolt-loaded laminate.