Glass fiber reinforced aluminum

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When Airbus A380 comes Glare extensively used.

Glass fiber reinforced aluminum (also GLARE ) is a hybrid material that consists of many layers, each only a few tenths of a millimeter thick. These layers consist alternately of aluminum and a glass fiber laminate ( glass fiber reinforced plastic ). The layers are glued together under pressure.

The word Glare is an acronym and stands for G lass L aminate A luminium R enforced E poxy . The material was developed jointly with the Technical University of Delft and the National Aerospace Laboratory (NLR) in the Netherlands. It was specially developed for aircraft construction and was first used extensively in the passenger version of the Airbus A380 , in which large parts of the upper outer shell are made of glare. There is already an improved version of the glare: the so-called HSS glare. With HSS for H igh S tatic S trength stands. In the production of the Airbus A380, the standard glare is now gradually being replaced by HSS glare.

The advantage over aluminum - up to now the standard material in aircraft construction - lies in the better burn-through and impact behavior. Another advantage over aluminum is its behavior towards cracks. Cracks are "bridged" by the glass fiber layers, so that the crack speed decreases with increasing crack length, while with aluminum the crack speed increases sharply. Therefore, it is mainly used because of its behavior towards cracks in the upper fuselage area and on the underside of the wing, as well as in the nose area of ​​the vertical stabilizer and in the cockpit area due to the impact behavior. In addition, glare components can be specifically adapted to certain load conditions through function-optimized fiber orientation. The density of glare is roughly the same as that of aluminum commonly used in aircraft construction, but it can vary somewhat depending on the layer thickness.

The reduced modulus of elasticity is a disadvantage . With the glare it is approx. 57,000 N / mm² (elasticity module of duralumin : approx. 73,000 N / mm²). Due to the lower rigidity, fluttering or swinging can occur. Another disadvantage is the price of glare, which is about six times higher than the price of aluminum. In addition, aluminum is easier to process because when installing glare, particular care must be taken that the individual layers do not become detached from one another ( delamination ) or that chips are pressed between the glass fiber and aluminum layers when drilling.

literature

  • David Hummelberger: Hybrid material systems. Systematic consideration and evaluation of the physical mechanisms of action, Scientific Publishing, Karlsruhe 2019, ISBN 978-3-7315-0901-1 .

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