In this study, an assessment of the composite processing-related properties of a newly developed 6-FDA-based phenylethynyl-terminated polyimide (available under the tradename NEXIMID Õ MHT-R) is presented. Processing schemes, used for preparing high quality carbon fibre-reinforced composites by the use of conventional resin transfer moulding are developed and presented. The influences of manufacturing parameters on glass transition temperature of the composites are presented. The results confirm that composites with exceptionally high T g , in the range between 350 and 460 C can be achieved. A manufacturing scheme that yields in composites with T g of 370 C is presented and proposed as a good candidate to serve as baseline for further studies.
Hybridisation of multidirectional carbon fibre-reinforced composites as a means of improving the compressive performance is studied. The aim was to thoroughly investigate how hybridisation influenced the laminate behaviour under different compression conditions and thus understand the "hybrid effect". The compressive performance of two monolithic carbon fibre/epoxy systems were compared with their respective hybrids by keeping the same layup throughout but replacing the angle plies in one case or the orthogonal plies in the other case with the second material. Compact and plain compression tests were employed which also gave an insight into the sensitivity of compressive failure to geometry and loading conditions. The experimental results and the subsequent fractographic analysis revealed that the hybridisation of selective ply interfaces influenced the location and severity of the failure mechanisms. In light of this knowledge, the generic sequence of failure which led to global fracture in multidirectional fibre-reinforced composites under compression is presented.Response to Reviewers: Thank you for your response to our revision. We have amended the references as indicated below; 4: Updated 5: Although not required, I corrected a typo 12: I could not find any journal paper which could relate to that conference paper (Web of Science, Science Direct, the authors' personal and Google Scholar pages) 15: This is the reference to a thesis, so no change can be made 16: This is the reference to the CRASHCOMPS proposal from EPSRC 29: #29 does not exist on the reference list, but I updated #27 Thank you for the referee comments for our research paper entitled "Compressive failure of hybrid multidirectional fibre-reinforced composites" to be considered for publication in Composite A. We have subsequently addressed all the concerns of the referees, and therefore submit a revised version of the paper. Thank you for taking the time to consider our work and I look forward to your response.Please find attached the modified the paper (both track changes and clean versions).
Yours sincerely, Emile GreenhalghResponse to Reviewers and Editor
AbstractIn this paper, the hybridisation of multidirectional carbon fibre-reinforced composites as a means of improving the compressive performance is studied. The aim is to thoroughly investigate how hybridisation influences the laminate behaviour under different compression conditions and thus provide an explanation of the "hybrid effect".The chosen approach was to compare the compressive performance of two monolithic carbon fibre/epoxy systems, CYTEC HTS/MTM44-1 and IMS/MTM44-1, with that of their respective hybrids. This was done by keeping the same layup throughout ((0/90/45/-45) 2S ) while replacing the angle plies in one case or the orthogonal plies in the other case with the second material, thus producing two hybrid systems. To investigate the compressive performance of these configurations, compact and plain compression test methods were employed which also allowed study...
In this study, the mechanical performance assessment of a newly developed carbon fibre-reinforced polyimide composite system T650/NEXIMID® MHT-R is presented. This system was subjected to a series of mechanical tests at ambient and elevated temperature (320℃) to determine basic material properties. Moreover, an additional test was conducted, using a T650/NEXIMID® MHT-R laminate in which the fibre sizing was thermally removed prior to laminate manufacturing, to investigate the effect of fibre treatment on mechanical performance. The experimental results indicated that the T650/NEXIMID® MHT-R composites along with exceptionally high Tg (360–420℃) exhibited competitive mechanical properties to other commercially available polyimide and epoxy-based systems. At elevated temperature, the fibre-dominated properties were not affected whilst the properties defined by matrix and fibre/matrix interface were degraded by approximately 20–30%. Finally, the fibre sizing removal did not affect the tensile and compressive strength, however, the shear strength obtained from short-beam shear test was deteriorated by approximately 15%.
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