Communication Dans Un Congrès Année : 2019

Architectured materials for space applications: a computational tool for the parametric optimization of a three-dimensional lattice subjected to stiffness constraints

Résumé

Architectured materials, whose discrete configuration provides unique combinations of enhanced structural properties at low weight, solved a variety of technical challenges in material science, architecture, aerodynamics and mechanical engineering. This peculiar characteristic, together with a high degree of design freedom leading to the possibility to tailor their mechanical properties in each direction, makes them very promising in a vast number of industries including aerospace, automotive, marine and constructions. However, the use of architectured materials is conditional upon the development of appropriate constitutive models for revealing the complex relations between the parameters of the microstructure and the macroscopic behavior. Notwithstanding a great variety of analytical and numerical techniques have been proposed and discussed in recent years, explicit formulas for the effective mechanical properties are derived in a very small number of investigations. To provide a contribution in this limitedly explored research area, this paper describes the mathematical formulation and modelling technique leading to closed-form expressions for the effective stiffness of a three-dimensional lattice composed of identical hexatruss cells. The derived analytical relations, verified by performing experimental tests on a 3D-printed lattice, are then integrated into a parametric optimization problem for finding the optimal microstructure's parameters that meet a given set of stiffness requirements. This strategy offers a less computationally way to solve optimization problems for architectured materials and, as a practical example, the specific case of the Spacecraft-Launcher Damping Interface is considered. The developed theory, however, is general enough to be easily applied to different types of structures in the aerospace industry.

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Dates et versions

hal-04840779 , version 1 (18-12-2024)

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F. Ongaro, K. Mathis, F. Masson, Justin Dirrenberger. Architectured materials for space applications: a computational tool for the parametric optimization of a three-dimensional lattice subjected to stiffness constraints. 8th European Conference for Aeronautics and Space Sciences (EUCASS), Jul 2019, Madrid, Spain. ⟨10.13009/EUCASS2019-167⟩. ⟨hal-04840779⟩
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