Bonded flush repairs for aerospace composite structures
Résumé
Bonded repairs for aerospace composite structures are very promising thanks to the high strength recovery rate they can achieve while keeping a good strength to mass ratio. Flush repairs, i.e. scarf and stepped repairs, are the most suitable for repairing load-carrying structures as they provide maximum repairs efficiency while keeping a smooth aerodynamic surface. Design of composite bonded repairs is challenging because of their complex failure behaviour. This paper reviews existing work on flush repair design. It includes a synthesis of experimental results on static failure behaviour, and of modelling approaches by analytical, semi-analytical and finite element techniques. Recent investigations on flush repairs are pointed towards optimization, durability and reliability purposes: many innovative repair designs were identified, that could allow reducing greatly flush repairs size while keeping constant strength. Beyond static behaviour, recent works were reported on damage tolerant design for bonded repairs, along with fatigue and impact behaviour, that could raise the level of confidence that is given to composite bonded repairs.
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