engleski

Experimantal and Numerical Modelling of Open-cell Cellular Structures

The paper describes the behaviour of regular open-cell cellular structures under dynamic com-pressive loading and the influence of the pore filler. Such materials, with their high energy absorp-tion, are of particular importance as crash absorbers where impact energy is absorbed and dissi-pated. Open-cell cellular specimens made of aluminium alloy and polymer have been experimen-tally tested with aim to determine their stiffness, and for validation of the computational models. The quasi-static and dynamic compressive loading has been applied to the open-cell cellular struc-tures in order to evaluate the strain rate sensitivity. Additionally, cellular specimens with filler material have been subjected to compressive loading. The specimens with the filler material have shown that the observed brittle behaviour at rupture has been reduced and the energy absorption increased. Such structures are also very strain rate dependent. Further investigations of the filler influence were carried out with extensive dynamic nonlinear computational simulations. Computational results of the open-cell cellular structure have shown that the influence of the filler increases with increasing the relative density. The developed computational models provide for better understanding of behaviour of such ma-terials and development of new approaches for design of open-cell cellular structures.

cellular structures; open cells; experiments; computational modelling; dynamic load-ing

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