Four kinds of laminated puncture structural C

f

/Al composites with volume fraction of 47.5% of carbon fiber were fabricated by vacuum pressure infiltration.The effects of Z-direction puncture structural parameters on the density

microstructure and shearing properties of C

f

/Al composites were investigated.The results reveal that the Z-direction puncture structural parameters have great influence on the density

microstructure and shearing properties of C

f

/Al composites.With Z-direction puncture fiber bundles of single stock

and the needle spacing of 3 mm/needle and 4 mm/needle

respectively

the density

shearing strength and modulus of C

f

/Al composites are 95.0%

69.9 MPa

7.47 GPa and 95.5%

65.3 MPa

8.38 GPa

respectively.With Z-direction puncture fiber bundles of double stock and the needle spacing of 3 mm/needle and 4 mm/needle

respectively

the density

shearing strength and modulus of C

f

/Al composites reach up to 96.3%

78.6 MPa

8.26 GPa and 96.0%

63.7 MPa

8.12 GPa

respectively.Compared with the microstructures of the other three composites

with Z-direction puncture fiber bundles of double socks

and the needle spacing of 3 mm/needle of C

f

/Al composites

the fiber filaments are evenly distributed and absence of obvious micro-voids defects.Shear failure of composites is attributed to occurrence of the crack at the matrix and interface damage of V-notch

and the cracks and shear force extending at 45°as well as the buckling deformation of the warp fiber bundles

the extrusion deformation of the weft fiber bundles and the deflection of the Z-direction puncture fiber bundles lead to the ultimate failure of composites.