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Applied Composite Materials

, Volume 25, Issue 2, pp 269–298 | Cite as

NiTi SMA Wires Coupled with Kevlar Fabric: a Real Application of an Innovative Aircraft LE Slat System in SMAHC Material

  • M. Guida
  • F. Marulo
  • S. Russo
Article
  • 345 Downloads

Abstract

This paper investigates experimentally and numerically the response of a smart hybrid thermoplastic aircraft slat system subjected to a short-duration and high-frequency event like a birdstrike. The focus of the paper is to exploit the ability that superelastic shape memory alloys have to absorb and dissipate energy compared to conventional composite structures. The final objective of the work is to develop an innovative thermoplastic wing leading edge slat able to resist to an impact of 4-lb (1.8 kg) bird at speed of 350 kts (132 m/s), as requested by the aeronautical requirements. Aircraft leading edges must be certified for a proven level of bird impact resistance. In particular, the main structural requirement is to protect the torsion box and control devices from any significant damage caused by birdstrike in order to allow the aircraft to land safely. A clear increase of the composites toughness and higher absorbed energy levels before failure were also observed. This is due to the fact that SMA wires can absorb kinetic energy during the impact due to their remarkably large failure and recoverable strain and to their superelastic and hysteretic behaviour. The activities have been performed within the European Project COALESCE “Cost Efficient Advanced Leading Edge Structure”, funded by the Seventh Framework Program Theme 7 Transport (incl. Aeronautics).

Keywords

Bird impact Aeronautical slat structure Thermoplastic material Shape Memory Alloy Composite structures 

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Department of Industrial EngineeringUniversity of Naples “Federico II”NaplesItaly
  2. 2.Leonardo Aircraft DivisionPomigliano d’ArcoItaly

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