A numerical investigation on significant parameters influencing the flatwise compressive behaviour of a NomexTM Honeycomb

Abstract Sandwich panels are structural elements widely used, especially in aerospace field, because their high stiffness with a low weight. However the assessment of a detailed and reliable mechanical behaviour especially in compression is, at present, a key task for a large exploitation in primary structures. Due to the large amount and variance in manufacturing processes, the fitting of precise material model behaviour is in fact not a straightforward process. Geometry, material and technological characteristics furnished by the manufacturers are often not sufficient to build a comprehensive model that is representative of the real product. Therefore, starting from an experimental-numerical experience, based on “virtual test” approach of a flatwise compressive test on a Nomextm Honeycomb core, a parametrical analysis of the most significant parameters is carried on by means of Finite Element models. The variation influence of several parameters ( wall thickness, dipping thickness, Nomex mechanical characteristic , etc) is investigated around a reference and optimal solution. The influence of the variation of these parameters on the numerical virtual model of the Honeycomb is reported and finally discussed with the aim to help the tailor process of a material behaviour model.