Influencia de la uniformidad de las capas no tejidas intercaladas en la tenacidad a la fractura de los compuestos laminados de tejidos de carbono

Abstract

This study assesses the effect of fibre distribution of interleaved

nonwovens veils on the mode I and mode II interlaminar fracture

toughness (IFT) of reinforced laminated composites. Polyphenylene

Sulfide (PPS) handsheet fibre samples with different fibre

distributions were manufactured following the standard TAPPI T205

for manufacturing handsheet nonwoven samples. The key parameters

of the process were iterated to obtain an empirical manufacturing

procedure for achieving three main types of fibre distribution on

handsheets, which were qualitatively defined as good, medium and

bad fibre distribution. These handsheet samples were subsequently

interleaved into carbon fibre-epoxy laminated composites and tested

for mode I and mode II IFT according to standard ISO 15027 and the

protocol for 4 End Notched Flexure (4ENF) respectively. The results

show that there is no significant effect of fibre distribution on mode

I IFT, whereas the mode II IFT showed a notable dependence on

fibre distribution. A fractographic analysis shows the fibre bridging

mechanism with no significant difference among the three types for

the samples tested for mode I IFT, but a significant number of cusps,

fibre clusters and ribbons in the samples tested for mode II IFT that

contributed to the absorption of fracture energy according to their

amount, size and distribution.