Etude de la variabilité et du spectre d'utilisation de structures composites carbone-époxy pour l'aviation légère

Abstract : This study has two objectives: industrially it contributes to the certification of a four-seaterlight aircraft (MCR 4S) following the CS 23 standard governed by EASA (EuropeanAviation Safety Agency) and scientifically, it searches to better understand the linkbetween the variability of materials and structural behavior. The study of variability showsa wide dispersion of mechanical characteristics such that is impossible to optimize thesafety factor. From this, further study is conducted and identified the origins of variabilityi.e., non homogeneity of the thickness and therefore the fiber volume content due to themanufacturing process used (contact molding).From instrumentation by strain gages on targeted areas of the wing, a flight test isperformed in order to extract a spectrum of use in service on different configurations flight(taxiing, takeoff, climb, level flight, descent, turn and landing). This spectrum issubsequently used in a fatigue test on the wing in order to understand the damagemechanisms in this case. Together, a numerical model of the wing validated by static testson the wing helped to better understand the behavior of the wing through a detailed stressdistribution.
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Ahmed El Habib. Etude de la variabilité et du spectre d'utilisation de structures composites carbone-époxy pour l'aviation légère. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0020⟩. ⟨tel-02003813⟩

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