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Three-Dimensional BEM and FEM Submodelling in a Cracked FML Full Scale Aeronautic Panel

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Abstract

This paper concerns the numerical characterization of the fatigue strength of a flat stiffened panel, designed as a fiber metal laminate (FML) and made of Aluminum alloy and Fiber Glass FRP. The panel is full scale and was tested (in a previous work) under fatigue biaxial loads, applied by means of a multi-axial fatigue machine: an initial through the thickness notch was created in the panel and the aforementioned biaxial fatigue load applied, causing a crack initiation and propagation in the Aluminum layers. Moreover, (still in a previous work), the fatigue test was simulated by the Dual Boundary Element Method (DBEM) in a bidimensional approach. Now, in order to validate the assumptions made in the aforementioned DBEM approach and concerning the delamination area size and the fiber integrity during crack propagation, three-dimensional BEM and FEM submodelling analyses are realized. Due to the lack of experimental data on the delamination area size (normally increasing as the crack propagates), such area is calculated by iterative three-dimensional BEM or FEM analyses, considering the inter-laminar stresses and a delamination criterion. Such three-dimensional analyses, but in particular the FEM proposed model, can also provide insights into the fiber rupture problem. These DBEM-BEM or DBEM-FEM approaches aims at providing a general purpose evaluation tool for a better understanding of the fatigue resistance of FML panels, providing a deeper insight into the role of fiber stiffness and of delamination extension on the stress intensity factors.

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  1. Department of Industrial Engineering, University of Salerno, Salerno, Italy

    R. Citarella & G. Cricrì

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  1. R. Citarella
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  2. G. Cricrì
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Correspondence to R. Citarella.

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Citarella, R., Cricrì, G. Three-Dimensional BEM and FEM Submodelling in a Cracked FML Full Scale Aeronautic Panel. Appl Compos Mater 21, 557–577 (2014). https://doi.org/10.1007/s10443-014-9384-5

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  • DOI: https://doi.org/10.1007/s10443-014-9384-5

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