guide to resin systems(2)

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GTRS-3-0307 1 Guide to Resin Systems for Composites Introduction Resin systems such as epoxies and polyesters have limited use for the manufacture of structur es on their own, since their mechanical proper ties are not very high when compared to, for example, most metals. However , they have many desirable properties, most notably their ability to be easily formed into complex shapes. However, it is when the resin systems are combined with reinfor cing fibres such as glass, carbon an d aramid to form a composite, that exceptional properties can be obtained. The resin system acts as the matrix spreading the load applied to the composite between each of the individual fibres. The resin system also protects the fibres from damage through abrasion and impact.  Any resin system for use in a composite material will require the following properties: 1. Good mechanical properties 2. Good adhesive properties 3. Good toughness properties 4. Good resi st ance to envir on ment al degr ad ati on Mechanical Properties of the Resin System Fig. 1 below shows the stress/strain curve for an ‘ideal’ resin system. The curve for this resin shows high ultimate strength, high stiffness (indicated by the initial gradient) and a high strain to failure. This means that the resin is initially stiff but at the same time will not suffer from brittle failure. Plastic Deformation Strain to Failure Strain (%)       T      e      n      s       i       l      e       S       t      r      e      s      s Failure       E       l      a      s       t       i      c       D      e       f      o      r      m      a       t       i      o      n Ult. Tensile Strength

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Page 1: Guide to Resin Systems(2)

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