Advanced Techniques for Delamination Toughening in Carbon Fibre Reinforced Composites

Vasu Gupta

Abstract

Carbon fibre reinforced composites are widely used in various industries due to their excellent strengthto-weight ratio and stiffness properties. However, one of the major issues in these composites is delamination, which occurs due to the weak interlaminar bonding between the layers of fibers and matrix. Delamination leads to a reduction in the load-carrying capacity and structural integrity of the composite. To address this issue, several advanced techniques for delamination toughening in carbon fiber reinforced composites have been developed. One of the techniques involves the use of interleaving materials such as thermoplastic films or non-woven fabrics between the layers of the composite. These materials act as toughening agents and help to arrest the propagation of cracks that lead to delamination. Another technique involves the use of nanofillers such as carbon nanotubes, graphene, or nanoclays to reinforce the matrix and improve the interlaminar shear strength. These nanofillers not only increase the stiffness and strength of the composite but also improve its fracture toughness. In addition, the use of toughened matrices such as thermoplastic or rubber-toughened epoxies can also improve the delamination resistance of carbon fiber reinforced composites. These matrices have higher ductility and toughness than conventional epoxy matrices, which helps to absorb energy and prevent the propagation of cracks. Other techniques include the use of z-pinning, stitching, and braiding methods to improve the interlaminar shear strength and prevent delamination. Z-pinning involves the insertion of transverse pins through the thickness of the composite to increase the interlaminar shear strength. Stitching and braiding methods involve the use of yarns or fibers to interlock the layers of the composite and improve its delamination resistance. Overall, the development of advanced techniques for delamination toughening in carbon fiber reinforced composites has significantly improved the structural integrity and load-carrying capacity of these materials, making them more suitable for a wider range of applications.

Advanced Techniques for Delamination Toughening in Carbon Fibre Reinforced Composites

Abstract

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