  An effective computational framework of an anisotropic phase field model is
used to explore the effects of interface properties, effective critical energy
release rates and hole shapes on the failure process of fibre-reinforced
composites in this paper. In this framework, the phase field method is solved
under the background of the finite element method, and the influence of strong
and weak interfaces on the failure strength of composite materials is studied.
The results show that when the material fails, the strong interface shows
brittleness, and the weak interface shows toughness, which can improve the
failure strength of the material. At the same time, the effective critical
energy release rate is introduced in the calculation, which reduces the
fracture toughness of the material, makes the prediction results more
consistent with the experimental results, and improves the accuracy of the
results. The effect of hole shapes on the failure of the composites is also
explored, and the crack propagation of different hole shapes is captured, which
shows that the bearing capacity of a plate with a hole is not only related to
the shape of the hole but also related to the location of the hole concentrated
stress and the number of locations where the hole bears the load. The bearing
capacity of the material can be improved by changing the shape of the hole.
These results reveal the influence of different factors on the failure of
composites and lay a foundation for the effective design of composites.
