On the modelling of compressive response of closed-cell aluminium foams under high-strain rate loading

0431565 - ÚTAM 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Koudelka_ml., P. - Zlámal, Petr - Fíla, Tomáš
On the modelling of compressive response of closed-cell aluminium foams under high-strain rate loading.
Proceedings of XIIIth youth symposium on experimental solid mechanics. Praha: Czech Technical University in Prague, Faculty of Transportation Sciences, 2014 - (Kytýř, D.; Zlámal, P.; Růžička, M.), s. 61-65. ISBN 978-80-01-05556-4.
[Youth symposium on experimental solid mechanics /13./. Děčín (CZ), 29.06.2014-02.07.2014]
Grant CEP: GA ČR(CZ) GAP105/12/0824
Institucionální podpora: RVO:68378297
Klíčová slova: aluminium foam * high strain-rate compression * finite element modelling
Kód oboru RIV: JI - Kompozitní materiály
http://www.itam.cas.cz/ysesm2014/proceedings/id_4_ysesm2014_proceedings.pdf

Porous metals and particularly aluminium foams are attractive materials for crash applications where constructional elements have to be able to absorb considerable amount of deformation energy while having as low weight as possible. Compressive behaviour for medium impact velocities can be experimentally assessed from a series of droptower impact tests instrumented with accelerometer and high-speed camera. However to predict such behaviour a proper modelling scheme has to be developed. In this paper droptower impact tests of Alporas aluminium foam were used for development of a material model for explicit finite element simulations of high-strain rate deformation process using LS-DYNA simulation environment. From the material models available low density foam, Fu-Chang’s foam, crushable foam and modified crushable foam models were selected for simulations using smoothed-particle hydrodynamics and solid formulations respectively. Numerical simulations were performed in order to assess constitutive parameters of these models and identify material model describing deformation behaviour of Alporas with the best accuracy.
Trvalý link: http://hdl.handle.net/11104/0236178