Airplanes are the man-‐made birds of the sky. Their efficiency for travelling, humanitarian aid, war and transport are self-‐evident. They have demonstrated to be safe and fast, with a constant increase in the number of users and passengers throughout the years. Intense research is carried out in this field, and the aerodynamics, electronics and materials of the aircrafts have been continuously evolving. The aerospace and automotive industries have been replacing heavy materials, such as steel or aluminium, by lighter and tougher alternatives such as composite materials, which play nowadays a dramatic role in aircraft’s composition. For example, aluminium is being replaced by GLARE (“Glass Laminate Aluminium Reinforced Epoxy"), a structure that interlays aluminium films with glass fibre prepreg laminates, with better damage tolerance, corrosion and fire resistance, and lower specific weight than conventional aluminium. Boeing 787 is made by a 50% of composite materials, including them in its fuselage, wings, tail, doors and interior. Airbus 380, the world’s largest passenger airliner, is made by a 25% of composite materials. Composites used in the aerospace engineering are made of a resin, generally a polymer, and a reinforcement, such as carbon or glass fibres. In particular, according to F. Fischer et al.: “The use of carbon-‐fibre reinforced plastics (CFRP) is increasing in all areas where weight reduction enables an improvement, either in an economic or ecological way or as regards performance”. Polymers can be, essentially, of three kinds: thermoplastics, thermosets and elastomers. Polymers count with the benefits of excellent bulk and surface properties, low cost and good mechanical applications nowadays. Thermoplastics present high ductility, fracture toughness and impact resistance; moreover, thermoplastic composites (TPCs) can be cost-‐effectively joined and manufactured. Thermosets, on the other hand, do not count with these properties, but they have good compression, fatigue resistance and creep ...
Hybrid welding of thermoset and thermoplastic composites: adhesion improvement
2015-07-10
Theses
Electronic Resource
English
DDC: | 621 |
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