Using T800 grade carbon fiber/epoxy resin unidirectional tape automatic laying prepreg

test laminates with different thinkness were manufactured by automatic fiber placement process. The effects of curing pressure

laminate thinkness and size

automatic fiber placement pressure and other parameters on porosity and porosity distribution were investigated. Composites porosity intervals were characterized using ultrasonic C-scan. The results show that when the curing pressure drops to a certain critical point

the porosity increases rapidly first and then slows down gradually; Thicker laminates have higher porosity than thinner laminates

and there are more pores near the middle and bottom of the ply; For laminaters with a larger size

the areas with high porosity are relatively concentrated near the middle of the laminates

and the porosity interval is large; When the curing pressure is low

the laminates laid with a small laying pressures will form a higher porosity; For large and complex composites structures

the influence of different automatic fiber placement parameters on porosity also has the above trend.