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http://bura.brunel.ac.uk/handle/2438/23712
Title: | MEM vs. FEM: Practical crashworthiness insights for Macro Element Modelling applied to sub-assembly and full vehicle automotive structures |
Authors: | Hughes, K Ramos, J Vignjevic, R Krzywoblocki, M Djordjevic, N Campbell, J |
Keywords: | dynamic axial collapse of thin-walled automotive crash structures;component and full vehicle crash onto a rigid barrier;macro element method;LS-DYNA3D;correlation and error minimisation |
Issue Date: | 7-Dec-2021 |
Publisher: | Routledge (Taylor & Francis Group) |
Citation: | Hughes, K. et al. (2022) 'MEM vs. FEM: practical crashworthiness insights for macro element modelling applied to sub-assembly and full vehicle automotive structures', International Journal of Crashworthiness, 27 (6), pp. 1708 - 1725. doi: 10.1080/13588265.2021.2008191. |
Abstract: | Copyright © 2021The Author(s). This paper proposes a modelling approach for integral vehicle structures, applied to frontal crash loading, based on the Macro element approach. Addressing the idealisation of complex sub-structures and full vehicle was through identification of critical parameters for conversion of validated FEM into MEM equivalents through sensitivity analyses. Two examples of impact onto rigid barriers are presented; 1). Frontal crash energy management system (consisting crush-can and longitudinal engine rail), impacting at 8.6 m/s and 2). A complete vehicle impact at 56 km/hr (15m/s). Both case studies predict key features of collapse, with force-time histories agreeing within ±10–15% against FEM. Case study 1 required a 3 second solution time versus 1.5 h (8CPUS) mass-scaled FEM (105k element). For Case study 2, MEM required 7.5mins versus 16.5 hrs for a 3 M element FEM vehicle. For all simulations, LS-DYNA R10.0 and Visual Crash Studio R4.0 used. Developing a framework to overcome accuracy/stability problems, together with issues related to robustness and error reduction is discussed. Model complexity was progressive, involving a-priori knowledge of collapse and/or analysing several sub-assemblies to guide idealisation. The level of agreement demonstrates the advantages of MEM as a complementary method to support conceptual vehicle design and offers significant advantages for design exploration, particularly across multiple crash certification cases. |
Description: | Acknowledgements: The authors express their thanks to Impact Design Europe and Jaguar LandRover (Dr Tayeb Zeguer and Dr Stefan Hunkeler) for technical support. |
URI: | https://bura.brunel.ac.uk/handle/2438/23712 |
DOI: | https://doi.org/10.1080/13588265.2021.2008191 |
ISSN: | 1358-8265 |
Other Identifiers: | ORCID iD: Kevin Hughes https://orcid.org/0000-0002-8522-7903 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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FullText.pdf | Copyright © 2021The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | 6.48 MB | Adobe PDF | View/Open |
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