Fiber grid structure interlayer toughening composite material and preparation method thereof

The invention provides a fiber grid structure interlayer toughening composite material. The fiber grid structure interlayer toughening composite material is obtained by pouring and forming a fiber preform and resin-based slurry, the fiber preform comprises carbon fiber cloth and a toughening layer arranged between the carbon fiber cloth; the toughening layer is a fiber grid layer formed by interweaving fibers, the diameter of the fibers is 100 nanometers to 100 micrometers, and the distance between the fibers is 10 micrometers to 10 millimeters. The design of the fiber grid has the advantages that firstly, the porosity is higher, and sufficient infiltration of resin is better facilitated; secondly, fewer materials are used, so that the cost is saved; besides, the construction of a fiber-resin-fiber non-continuous interlayer toughening phase is beneficial to trapping crack propagation in a toughening layer and triggering multiple toughening mechanisms, so that the interlayer fracture toughness of the fiber com