Abstract
The aim of this study is to investigate the influence of different types of carbon nanoparticles like multi-wall carbon nanotubes (MWCNT) and few layered graphene (FLG) on the damage mechanisms of carbon fibre reinforced epoxy (CFRP) under fatigue loading up to the high cycle regime. Specimens were manufactured from in-house made prepregs to ensure good and reproducible nanoparticle distribution within the CFRP and penetration of the fibre rovings. The quasi-static mechanical properties of the crossply laminates were not affected by the nanoparticle modification. The fatigue life, however, increased significantly for both types of carbon nanoparticles, being most pronounced for FLG at high fatigue loads. Scanning electron microscopy-analysis revealed enormous plastic deformation of the matrix due to the nanoparticles. The fatigue life increasing effect was discussed by means of energy absorption. Nanoparticle-based damage mechanisms in CFRP were displayed and differences due to the varying nanoparticle structures identified.
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