Int.J.Sol.Struct 44, 2990-3003, 2007

NUMERICAL SIMULATIONS OF 3D OPEN CELL STRUCTURES - INFLUENCE OF STRUCTURAL IRREGULARITIES ON ELASTO-PLASTICITY AND DEFORMATION LOCALIZATION

M.H. Luxner¹, J. Stampfl², H.E.Pettermann¹

¹Institute of Lightweight Design and Structural Biomechanics,
TU Wien, Vienna, Austria
²Institute of Materials Science and Technology,
TU Wien, Vienna, Austria


Abstract - The mechanical properties of open cell structures made from an elasticplastic bulk material are investigated by Finite Element simulations. The influence of structural irregularities on elasto-plasticity and deformation localization of open cell structures is analyzed. Six regular three-dimensional generic structures with a relative density of 12.5% are modeled by a unit cell approach for predicting the entire tensors of elasticity. From these six structures the two structures with the lowest and the highest elastic anisotropy are selected for further studies, introducing various degrees of structural irregularities. The effect of these irregularities on the linear and nonlinear behavior as well as the influence on the deformation localization is studied employing finite sample models. Results are presented by means of the direction dependent Youngs moduli, deformation plots, overall stressstrain curves, and histograms of the energy distribution.

(hjb,070314)