The high velocity impact performance in hybrid woven carbon and S2 and E glass fabric laminates manufactured by resin transfer molding (RTM) was studied. Specimens with different thicknesses and glass-fiber content were tested against 5.5 mm spherical projectiles with impact velocities ranging from 300 to 700 m/s to obtain the ballistic limit. The resulting deformation and fracture micromechanisms were studied. Several impacts were performed on the same specimens to identify the multihit behavior of such laminates. The results of the fracture analysis, in conjunction with those of the impact tests, were used to describe the role played by glass-fiber hybridization on the fracture micromechanisms and on the overall laminate performance under high velocity impact. It is clear that hybrid composites are capable of absorbing greater amounts of energy than carbon fibers composites. The damage mechanism responsible for this increment is interface delamination. In the tests no major delamination was observed in carbon fiber laminates. The position of the glass fiber plies is more important than the amount of hybridization when subjecting laminates to high strain rates. The closer the glass fibers are to the rear surface of the samples, it seems the better is performance of the laminate. There is no evidence of different behavior of composites reinforced with glass fiber of type E and glass fiber S. All the laminates showed a significantly-high damage tolerance. Consecutive impacts in the same sample do not affect the impact behavior of carbon composites. This is also true for nondelaminated hybrid composites. Once the sample is delaminated, it is divided in two parts.
Impact behavior of hybrid glass/carbon epoxy composites
Einschussverhalten von Glas/Kohle-Epoxid-Hybridkompositen
2013
7 Seiten, 13 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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