Computational & Technology Resources
an online resource for computational,
engineering & technology publications
Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by:
Paper 89

Development and Validation of Material Models for Closed-Cell Metal Foam for Impact Simulation

O. Jirousek, P. Zlamal, P. Koudelka and T. Fila

Department of Biomechanics, Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

Full Bibliographic Reference for this paper
O. Jirousek, P. Zlamal, P. Koudelka, T. Fila, "Development and Validation of Material Models for Closed-Cell Metal Foam for Impact Simulation", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 89, 2014. doi:10.4203/ccp.106.89
Keywords: closed-cell metal foam, explicit time integration, constitutive model, impact simulation, drop test..

Summary
In this paper identification of constitutive material model for closed-cell metal foam used for medium strain rate simulations is presented. The material model is developed based on a series of compression tests at different strain rates. Cubic samples of metallic foam were compressed in a drop tower in which different drop heights and different dead weights were used to achieve the required strain rate. During the compression and compaction of the samples the strains were measured using a high-speed camera to capture the deforming microstructure for DIC strain evaluation. From the stress-strain curves obtained for variable strain rates the parameters of the constitutive model were established. Two element types were used to represent the sample: i) smoothed-particle hydrodynamics element type with full integration scheme and ii) solid element with reduced (one-point) integration scheme. To compare the behaviour of the material models, the sample was modelled using the LS-DYNA explicit finite element solver using either Fu-Chang, low density foam, crushable foam and modified crushable foam material models. The compressive behaviour of the model in the selected region of strain rates was compared with the experimentally measured values.

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £65 +P&P)