Interlaminar properties

Another approach to exploit the properties of nanocarbons consists in integrating them in standard fiber-reinforced polymer composites (FRPC). The rationale behind this route is to form a hierarchical composite, with the nanocarbon playing a role at the nanoscale and the macroscopic fiber providing mainly mechanical reinforcement. This strategy typically aims to give FRPCs added functionality, improve their interlaminar properties and increase the fiber surface area. The first two properties are critical for the transport industry, for example, where the replacement of structural metallic... 

Interlaminar properties AU-4 fiber AS-4 fiber AS-4C fiber mPDA epoxy... 

Correlations between matrix properties and composite interlaminar properties... 

This section examines the advantages and disadvantages of using three-dimensional textile preforms, especially through-the-thickness stitches, as the reinforcements for composites. Their major mechanical properties are compared with those of conventional two-dimensional composites, such as strength, stiffness, interlaminar properties, impact resistance and tolerance, etc. Dransfield et al. (1994) have recently given a useful review on the improvement of interlaminar fracture toughness of stitched composites. 

Ogo, Y. (1987). The effect of stitching on in-plane interlaminar properties of carbon-epoxy fabric laminates, M.S. Thesis, University of Delaware, Delaware, USA. 

Hojo M, Matsuda S, Ochiai S, Tsujioka N, Nakanaishi Y, Maekawa Z, et al. Mode II interlaminar properties under static and fatigue loadings of for CF/epoxy laminates with different fiber-surface treatment. Adv Compos Mater 2001 10 237-46. http // dx.doi.org/lO. 1163/156855101753396717. 

The range of potential components that could be fabricated from porous matrix ceramic composites may be limited because of the poor mechanical properties of the porous matrix. Porous matrices generally yield composites with low compressive and interlaminar properties, making it difficult to design structures capable of carrying out-of-plane loads. Furthermore, it is difficult to attach porous matrix composites to neighboring structures. Three-dimensional fiber arehiteetures rather than two-dimensional laminate structures will probably be required for the components made from a porous matrix eeramie composite. 

Classical SPPCs can further be incorporated with nanofibers, in order to get hybrid composites. The nanofibrous structure can modify their interlaminar properties or even other properties to get functionalized hybrids for specific applications. On the other hand, nanofibers can be the primary reinforcement of composite materials. This subsection summarizes the potential of nanofibers in nanocomposites. 

Finer nanofibers resulted in better improvement in the interlaminar properties without compromising the in-plane performance of the toughened composites [146], thus decreasing the fiber diameters is favorable. It must be noted that (critical energy release rate... 

To improve the interlaminar properties of traditional composites the interleaving concept will be revisited. However, this time electrospun nanofiber mats, various nanomembranes will be preferentially used as interlayers. 

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