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Transcript of Composite Materials
require the following properties:
•Good mechanical properties
•Good adhesive properties
•Good toughness properties
•Good resistance to environmental degradation The Formula One is the highest automobile competition
The word "Formula"
Aerodynamic : Complex structure PROPERTIES MECHANICAL PROPERTIES High ultimate strength
High strain to failure ADHESIVE PROPERTIES High adhesion between resin and reinforcement fibres: prevent cracking or fibre / resin TOUGHNESS PROPERTIES The more deformation the resin will accept before failure the tougher and more crack-resistant the material will be TYPES Vinylester
Epoxy EPOXY RESIN Better mechanical properties
Resistance to environmental degradation
Excellent adhesive properties COMPARISON OF RESIN PROPERTIES MECHANICAL PROPERTIES ADESIVE PROPERTIES Vinylester < Polyester < Epoxy FATIGUE BEHAVIOUR Gradual accumulation of small amounts of damage ---- fatigue failure
Fatigue behavior is influence by the toughness SUMMARY REINFORCEMENT Why? Better mechanical properties
The four main factors that govern the fibre’s contribution are:
1. The basic mechanical properties of the fibre itself.
2. The surface interaction of fibre and resin (the ‘interface’).
3. The amount of fibre in the composite (‘Fibre Volume Fraction’).
4. The orientation of the fibres in the composite CARBON FIBER Initially stiff but at the same time will not suffer from brittle failure. The basic mechanical properties of the fibre itself. INTERFACE Controlled by the degree of bonding that exists
Treatment given to the fibre surface
Description of the different surface treatments Fibre Volume Fraction Governed by the manufacturing process used: Laminate
Stiffness and strength of a laminate will increase in proportion to the amount of fibre present