Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture
TypeArticles dans des revues avec comité de lecture
This paper deals with the characterization and the numerical modelling of the collapse of composite hollow spherical structures developed to absorb energy during high velocity impacts. The structure is composed of hollow spheres (ϕ=2–30 mm) made of epoxy resin and mineral powder. First of all, quasi-static and dynamic (v=5 mm·min−1 to v=2 m·s−1) compression tests are conducted at room temperature on a single sphere to study energy dissipation mechanisms. Fracture of the material appears to be predominant. A numerical model based on the discrete element method is investigated to simulate the single sphere crushing. The stress-strain-time relationship of the material based on the Ree-Eyring law is numerically implemented. The DEM modelling takes naturally into account the dynamic fracture and the crack path computed is close to the one observed experimentally in uniaxial compression. Eventually, high velocity impacts (v>100 m·s−1) of a hollow sphere on a rigid surface are conducted with an air cannon. The numerical results are in good agreement with the experimental data and demonstrate the ability of the present model to correctly describe the mechanical behavior of brittle materials at high strain rate.
Showing items related by title, author, creator and subject.
Study of the dynamic fracture of hollow spheres under compression using the Discrete Element Method CORE, Arthur; KOPP, Jean-Benoit; GIRARDOT, Jérémie; VIOT, Philippe (ELSEVIER, 2018)Hollow sphere structure (HSS) belongs to cellular solids that have been studied recently for its multiples properties. In our case, HSS aims to absorb soft impacts energy on an airliner cockpit. This structure is investigated ...
GUILLAUD, Nicolas; FROUSTEY, Catherine; DAU, Frédéric; VIOT, Philippe; LATAILLADE, Jean-Luc (2013)This study concerns Carbon / epoxy composite plates. Three di erent thickness were investigated ([0°=45°=90°=45°]i)S for i = 2, 3 or 4 (5, 10 and 15mm thick). An instrumented falling-weight-impact test machine was used for ...
Méthode des éléments discrets : des problèmes multi-corps aux problèmes d’endommagement dynamique complexes. IORDANOFF, Ivan; ANDRE, Damien; CHARLES, Jean-Luc; VIOT, Philippe (2011)La méthode des éléments discrets est présentée comme une alternative aux approches de type mécanique des milieux continus pour aborder certains aspects liés aux problèmes dynamiques, notamment la multi fracturation de ...
JEBAHI, Mohamed; CHARLES, Jean-Luc; DAU, Frédéric; ILLOUL, Lounès; IORDANOFF, Ivan (Elsevier, 2013)The coupling between two dissimilar numerical methods presents a major challenge, especially in case of discrete–continuum coupling. The Arlequin approach provides a flexible framework and presents several advantages in ...
JEBAHI, Mohamed; ANDRÉ, Damien; DAU, Frédéric; CHARLES, Jean-Luc; IORDANOFF, Ivan (Elsevier, 2013)The indentation response of glasses can be classified under three headings: normal, anomalous and intermediate, depending on the deformation mechanism and the cracking response. Silica glass, as a typical anomalous glass, ...