Numerical method for energy absorption maximization in latice structures and experimental validation

Lattice structures, and in general cellular solids, show good propensity to energy absorption capability and lightweight. These advanced materials are obtaining attention in research fields such as aerospace and automotive, where their functionalization and mechanical properties provide valid alternative to traditional viscoelastic materials and energy absorbers. In lattice structures, the macroscale mechanical properties can be tailored through their mesoscale configuration and in particular the topology of the unit cells. This investigation is aimed at the definition of a tool for the maximization of the energy absorption of lattice structures, and consequently the homogenization of the stress configuration inside the lattice. In order to perform it, a structural grading process has been developed: according to the initial stress state of the lattice, thicknesses of the struts are varied, generating a new graded configuration that shows enhanced mechanical properties. Finally, validating experiments are performed.