Steel and Composite Structures

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Mode-I fracture toughness of carbon fiber/epoxy composites interleaved by aramid nonwoven veils

  • Beylergil, Bertan (Department of Mechanical Engineering, Alanya Alaaddin Keykubat University) ;
  • Tanoglu, Metin (Department of Mechanical Engineering, Izmir Institute of Technology) ;
  • Aktas, Engin (Department of Civil Engineering, Izmir Institute of Technology)
  • Received : 2018.02.04
  • Accepted : 2019.03.22
  • Published : 2019.04.25
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Abstract

In this study, carbon fiber/epoxy (CF/EP) composites were interleaved with aramid nonwoven veils with an areal weight density of $8.5g/m^2$ to improve their Mode-I fracture toughness. The control and aramid interleaved CF/EP composite laminates were manufactured by VARTM in a [0]4 configuration. Tensile, three-point bending, compression, interlaminar shear, Charpy impact and Mode-I (DCB) fracture toughness values were determined to evaluate the effects of aramid nonwoven fabrics on the mechanical performance of the CF/EP composites. Thermomechanical behavior of the specimens was investigated by Dynamic Mechanical Analysis (DMA). The results showed that the propagation Mode-I fracture toughness values of CF/EP composites can be significantly improved (by about 72%) using aramid nonwoven fabrics. It was found that the main extrinsic toughening mechanism is aramid microfiber bridging acting behind the crack-tip. The incorporation of these nonwovens also increased interlaminar shear and Charpy impact strength by 10 and 16.5%, respectively. Moreover, it was revealed that the damping ability of the composites increased with the incorporation of aramid nonwoven fabrics in the interlaminar region of composites. On the other hand, they caused a reduction in in-plane mechanical properties due to the reduced carbon fiber volume fraction, increased thickness and void formation in the composites.

Keywords

References

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