Composites aramid/epoxy model

Andrews M C, Bannister D J and Young R J (1996) The interfacial properties of aramid/epoxy model composites, J Mater Sci 31 3893-3913. 

MC Andrews, RJ Young, J Mahy. Interfacial failure mechanisms in aramid/epoxy model composites. Composite Interf 2 433-456, 1994. 

Figure 8.12 shows the distribution of strain along a single Kevlar 149 fibre in a model single-fibre epoxy composite [38] calculated from the point-to-point variation of the shift of the 1610cm aramid Raman band. Measurements were taken at 20 pm intervals along the fibre for different levels of matrix strain e ranging from 0% to 2.0% in intervals of 0.4%, and the curves drawn are best fits to the experimental data. It can be seen that in the unstrained case (e = 0%) there is no strain in the fibre. As increases the strain in the fibre increases from... 

We have developed different nonwoven stmctures with para-aramid fibres, and produced thick 3D stmctures by associating several nonwoven monolayers with a consolidation treatment. Porous composites were afterwards manufactured by impregnating the fibrous stmctures with an epoxy resin. Both dry and impregnated materials were characterized in terms of stmcture (density, fibre volume fraction), and compression tests were used to evaluate mechanical properties. Equivalent pore size and distance between fibre contacts were determined using theoretical models. They help to provide some insight on the mechanical behaviour of the different stmctures. 

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