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Modelling and Simulation in Engineering
Volume 2014, Article ID 292647, 7 pages
http://dx.doi.org/10.1155/2014/292647
Research Article

Modeling Large Deformation and Failure of Expanded Polystyrene Crushable Foam Using LS-DYNA

Department of Mechanical Engineering, Faculty of Engineering, International Islamic University Malaysia, 53100 Jalan Gombak, Kuala Lumpur, Malaysia

Received 31 May 2013; Accepted 31 October 2013; Published 27 January 2014

Academic Editor: Dimitrios E. Manolakos

Copyright © 2014 Qasim H. Shah and A. Topa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the initial phase of the research work, quasistatic compression tests were conducted on the expanded polystyrene (EPS) crushable foam for material characterisation at low strain rates (  s−1) to obtain the stress strain curves. The resulting stress strain curves are compared well with the ones found in the literature. Numerical analysis of compression tests was carried out to validate them against experimental results. Additionally gravity-driven drop tests were carried out using a long rod projectile with semispherical end that penetrated into the EPS foam block. Long rod projectile drop tests were simulated in LS-DYNA by using suggested parameter enhancements that were able to compute the material damage and failure response precisely. The material parameters adjustment for successful modelling has been reported.