Mechanical properties of a density-graded replicated aluminum foam

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Continuous graded Gyroid cellular structures fabricated by selective laser melting: Design, manufacturing and mechanical properties (2019, methodology): “For cellular structures with a density gradient along the loading direction, by assuming them as the iso-stress composite models [53], the rule of mixtures (i.”
A mechanical property evaluation of graded density Al-Si10-Mg lattice structures manufactured by selective laser melting (2016, background): “Other work on graded metal cellular solids has focussed on foams[21–25] and honeycombs[26, 27], with 65 a result from Brothers and Dunand[22] clearly demonstrating the differences in compressive behaviour between graded and non-graded cellular structures.”
Fabrication and Mechanical Characterisation of Titanium Lattices with Graded Porosity (2014, unknown): “To date, some investigations on the mechanical [16,17] and thermal [18] properties of stochastic metal foams with structures graded in density or pore size have been reported, but the possibilities for lattices remain unexplored.”
Porous Metals and Metallic Foams: Current Status and Recent Developments (2008, unknown): “[82] J. Kwok, D. C. Dunand, 2008, in this issue of Adv.”
Compressive behaviour of 3D printed thermoplastic polyurethane honeycombs with graded densities (2019, background): “Brothers and Dunand [19] created similar foams by casting a replica of a polymeric graded precursor.”