The integration of numerical simulation and experimental measurements in cellular materials at the sub-cellular scale is a real challenge. On the experimental side, the almost absence of texture makes displacement fields measurement tricky. On the simulation side, it requires the construction of reliable and specimen-specific geometric and mechanic...
We develop a numerical methodology for the calculation of mode-I R-curves of brittle and elastoplastic lattice materials, and unveil the impact of lattice topology, relative density and constituent material behavior on the toughening response of 2D isotropic lattices. The approach is based on finite element calculations of the J-integral on a singl...
Published in Heliyon
Materials science; Mechanical properties; Cellular materials; Additive manufacturing; Titanium alloys
The mechanical response of cellular materials with spinodal topologies is numerically and experimentally investigated. Spinodal microstructures are generated by the numerical solution of the Cahn-Hilliard equation. Two different topologies are investigated: ‘solid models,’ where one of the two phases is modeled as a solid material and the remaining...
Published in Experimental Mechanics
This study carries out an experimental characterization of lattice structures that are based on cubic cells fabricated through selective laser melting (SLM) and electron beam melting (EBM). The lattice failure under compressive load is studied as a function of the process typology, material properties, and dimensional parameters of the unit cell. T...
This study carries out an experimental characterization of lattice structures that are based on cubic cells fabricated through selective laser melting (SLM) and electron beam melting (EBM). The lattice failure under compressive load is studied as a function of the process typology, material properties, and dimensional parameters of the unit cell. T...
The design of cellular materials with controlled energy dissipation is relevant to a broad range of applications, ranging from cushioning (such as shoes and athletic protection) to vibration control in damped, lightweight structures. Additive manufacturing has dramatically expanded the design space for such structures, enabling a diverse range of t...
Les travaux de cette thèse s’intéressent au comportement mécanique d’une mousse destinée à l’absorption d’énergie dans une assise de siège pilote. Les méthodes de caractérisation habituelles proposent de solliciter le matériau suivant une seule direction. Cependant, cette caractérisation ne permet pas d’être représentatif des sollicitations lors de...
This note deals with the shock behaviour of foams and cellular solids. An analytical expression of the Hugoniot stress–strain curve has been developed using micromechanical and energetic arguments. In the case of elastic-plastic cellular materials, the application of the proposed formula is straightforward and the shock behaviour can be predicted f...
Published in Materials Theory
We present results of a two-scale model of disordered cellular materials where we describe the microstructure in an idealized manner using a beam network model and then make a transition to a Cosserat-type continuum model describing the same material on the macroscopic scale. In such scale transitions, normally either bottom-up homogenization appro...
