Modèles numérique et stochastique des fixations pour la contrainte foudre des lignes d’assemblages sur avion

Paul Monferran 1
1 XLIM-SRF - Systèmes RF
XLIM - XLIM : SRF
Abstract : The lightning effects on the fastening assemblies of an airplane may be critical. One of the most critical phenomenon is the sparking effect around the fasteners. This effect is usually associated to the contact resistances. Due to the standards, the lack of knowledge about this multiphysics issue and the inability to follow only an experimental approach, the aircraft manufacturers have chosen a modelling way. In this manuscript, we model the fastening assemblies in order to understand the local constraint on these assemblies. The finite difference time domain (FDTD) method mostly used for the lightning issue in the aircraft industry is chosen as the solving method. Several fastener models are developed and validated. We present simplified models, as the resistive wire model for instance, up to complex one with all the contact resistance of the fastener. Furthermore, due to the large uncertainties from one fastener to the other one in the same family, the fastener models are supplemented with statistical models. Thanks to a data base measurement created from several measurement campaigns made by Dassault Aviation, distribution laws are established to characterize the lightning injection effects or the state after lightning injection on the fasteners. Using this statistical models, a stochastic study is presented in order to evaluate the uncertainties in a fuel tank modelling.
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Paul Monferran. Modèles numérique et stochastique des fixations pour la contrainte foudre des lignes d’assemblages sur avion. Génie mécanique [physics.class-ph]. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0095⟩. ⟨tel-02001105⟩

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