Kevlar graphite

More substantial delamination zones were observed under monotonically increased loads of quasi-isotropic carbon/epoxy laminate with moisture content m = 0.7% than in the dry case (Ogi et al. 1999) while a comparative drop of 5% was noted in the tensile strength of wet uniaxially reinforced Kevlar-graphite/ epoxy hybrid composites (Haque et al. 1991). Similar conclusions are implied elsewhere (Ogi and Takao 1998). An indirect confirmation of that case is implied in the above article by the observation that when plotted vs. a monotonically increased stress, the Poisson s ratio grows faster in the wet case than its dry counterpart. 

Hamada H, Maekawa Z,MoriiT,Gotoh A, TanimotoT (1991) Durability of adhesive bonded FRP joints iittmmsed in hot water. In Cardon AH, Verchery G (eds) Durability of polymer based composite systems for structural applications, vol 46. Elsevier, Amsterdam, pp 418-427 Haque A, Mahmood S, Walker L, Jeelani S (1991) Moisture and temperature induced degradation in tmrsile properties of kevlar-graphite/epoxy hybrid composites. J Reinforced Plast Compos 10(2) 132-145... 

As an illustration of the results of the measurements just described, the mechanical properties for four unidirectionally reinforced composite materials, glass-epoxy, boron-epoxy, graphite-epoxy, and Kevlar 49 -... 

Glass-Epoxy Boron-Epoxy Graphite-Epoxy Kevlar -Epoxy... 

The relevant properties of these materials for the torsional-mechanical analysis are listed in Table 8.11. On the basis of specific elastic modulus and specific shear modulus, the best materials are the graphite-fiber-reinforced epoxy resin, followed by either of the alloys, then the Kevlar fiber-reinforced epoxy. The chopped glass sheet molding compound is obviously not a good choice. 

Commercial applications have been identified primarily in the electronics industry where requirements for dimensional stability, mechanical properties, and high temperature resistance make these systems attractive in advanced circuit board technology. Other commercial applications include high temperature membranes and filters where these materials offer performance improvements over glass, Kevlar, and graphite composites. Industrial development of these types of materials will most likely be dependent on monomer cost and advances in various product properties requirements. 

Polymer composites consisting of polymers reinforced with various additives such as carbon fibers, graphite fibers, glass fibers, or Kevlar fibers and carbon black are increasingly being used in... 

Like other composite properties, the wear resistance is influenced by the orientation of reinforcing fibres. Sung and Suh found that with biaxially-oriented glass fibre and molybdenum disulphide in a PTFE matrix (Duroid 5813), the wear resistance was greatest when the highest proportion of fibre was normal to the sliding surface. The same effect was found with a graphite fibre/epoxy composite and a Kevlar fibre/epoxy composite. 

Besides graphite, carbon and glass fibers, organic fibers, e.g., Kevlar, have also been used to reinforce thermosetting resins, e.g., epoxy resin (38). One of the newest developments is fiber-reinforced thermoplastics, e.g., carbon fiber-reinforced polyether ether ketone (PEEK) ( ). These materials are rather tough as demonstrated in the interlaminar toughness values (Table... 

Property Unreinforced 30% Glass 30% Graphite Unreinforced 30% Glass 30% Graphite 30% Carbon Fibers Unreinforced 30% Glass 30% Carbon Fiber 20% Kevlar-49... 

Property E-glass 5-glass graphite HM graphite Kevlar 29 Kevlar 49 Boron, W core... 

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