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The elastic-plastic behavior of perforated aluminum sheets is examined in relation to the relative density. Different relative densities between 0.93 and 0.62 could be realized by modification of the hole spacing of the regular square penetration pattern. Uniaxial tension and compression tests are conducted at perforated plates made of the ductile aluminum alloy AlCuMg1. For the realisation of the compression tests, a specific device was designed to avoid the buckling of the thin specimens. The variation of the elastic modulus is measured during unloading to investigate the damage evolution. Continuum-mechanical characteristics are identified by means of the macro-behavior. The gained results for initial yielding, elongation and damage at rupture are discussed in the context of a modified Voigt-Reuss mixing rule.