The microstructure of domestic automated placement dry fibers was characterized and analyzed

with a comparative analysis against imported materials. Using a self-made glass mold and adopting the central injection method

the number of layers of domestic automated placement dry fibers was varied. Based on Darcy’s law

the permeability of domestic dry fibers was calculated

and the factors influencing their permeability were explored. The results indicate that domestic dry fibers share the same three-layer structure in microstructure as the imported dry fiber TX1100. The average diameter of fibers in the mesh layer of domestic dry fibers is 20 μm

three times that of TX1100. At the same layer count

the permeability in the X-direction is approximately twice that in the Y-direction. As the number of layers increases

the permeability in both X and Y directions rises

while penetration in the Z-direction is relatively difficult. Additionally

the permeability of dry fiber brand 231016FH is higher than that of 231227FH

and the fibers in the composite formed by 231016FH are arranged more tightly.