Browsing by Author "Rezai, Amir"
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Item Open Access Exploring mechanical property balance in tufted carbon fabric/epoxy composites.(Elsevier Science B.V., Amsterdam., 2007-11-01T00:00:00Z) Dell'Anno, Giuseppe; Cartié, Denis D. R.; Partridge, Ivana K.; Rezai, AmirThe paper details the manufacturing processes involved in the preparation of through-the-thickness reinforced composites via the ‘dry preform–tufting–liquid resin injection’ route. Samples for mechanical testing were prepared by tufting a 5 harness satin weave carbon fabric in a 3 mm × 3 mm square pitch configuration with a commercial glass or carbon tufting thread, infusing the reinforced preforms with liquid epoxy resin and curing them under moderate pressure. The glass thread reinforcement increases the compression-after-impact strength of a 3.3 mm thick carbon fabric laminate by 25%. The accompanying drop- downs in static tensile modulus and strength of the same tufted laminate are below 10%. The presence of tufts is also shown to result in a significant increase in the delamination crack growth resistance of tufted double-cantilever beam specimens and has been quantified for the case of a 6 mm thick tufted carbon non-crimped fabric (NCF)/epoxy cItem Open Access Mechanical properties balance in novel Z-pinned sandwich panels: out-of-plane properties.(Elsevier Science B.V., Amsterdam., 2005-04-18T00:00:00Z) Marasco, Andrea I.; Cartié, Denis D. R.; Partridge, Ivana K.; Rezai, AmirThe paper presents the first complete set of test results obtained from quasi- static measurements of the out-of-plane tension, shear and compression properties of novel XCor ™ and K-Cor™ flat sandwich panels. The cured panels were composed of 0.75mm thick quasi-isotropic IM7/8552 skins, separated by 12.7 mm thick Rohacell® foam core containing 0.51 mm diameter carbon fibre pins (Z- Fiber®), arranged in a truss pattern at pin angle of either 22° or 30° to the vertical. To obtain a suitable baseline comparison, the equivalent set of properties was measured for Nomex honeycomb core panels sandwiched by the same composite skins. The novel Z-pinned cores are found to exhibit higher specific stiffness than conventional sandwich cores, but lower sItem Open Access RTM processing and electrical performance of carbon nanotube modified epoxy/ fibre composites(2012-04-30T00:00:00Z) Reia da Costa, Elisabete F.; Skordos, Alexandros A.; Partridge, Ivana K.; Rezai, AmirThis investigation focuses on nanoparticle filtration in the processing of multiscale carbon and glass fibre composites via resin transfer moulding. Surface modified and unmodified carbon nanotubes (CNTs) were incorporated into a commercial epoxy resin. The dispersion quality was evaluated using electrical measurements of the liquid suspensions. The manufacturing process was adapted to the challenges posed by the modified rheological behaviour of the CNT loaded resin. Nanoparticle filtration was observed; with some of the unmodified systems following so called ‘cake filtration' behaviour. This resulted in nonlinear flow behaviour that deviated from the ideal response observed in RTM filling in conventional composites. The electrical conductivity of relatively high fibre volume fraction multiscale carbon and glass laminates increased by less than an order of magnitude with the addition of the nanotube