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Optimised design of nested oblong tube energy absorbers under lateral impact loading

Olabi, Abdul-Ghani and Morris, Edmund and Hashmi, Saleem and Gilchrist, Michael (2008) Optimised design of nested oblong tube energy absorbers under lateral impact loading. International Journal of Impact Engineering, 35 (1). pp. 10-26. ISSN 0734-743X

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Dynamic lateral crushing of mild steel (DIN 2393) nested tube systems was conducted using a ZWICK ROELL impact tester. The tests were performed with impact velocities ranging between 3 and 5 m/s, achieved using a fixed mass impinging onto the specimens under the influence of gravity. The various nested tube systems consisted of one standard and one optimised design. Their crushing behaviour and energy absorption capabilities were obtained and analysed. In addition to the experimental work, numerical simulations using the explicit code LS-DYNA were conducted; boundary conditions matching those observed in experiments were applied to the models. Results from the numerical method were compared against those obtained from experiments. An over-prediction in force-deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the formation of plastic hinges and the validity of strain rate parameters used in the Cowper Symonds relation. It was found that the optimised energy absorbers exhibited a more desirable force-deflection response than their standard counterparts due to a simple design modification which was incorporated in the optimised design.

Item Type:Article (Published)
Uncontrolled Keywords:tubes; energy absorption; finite element; plastic deformation; lateral compression; quasi-static; ANSYS;
Subjects:Engineering > Materials
Engineering > Mechanical engineering
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Official URL:
Copyright Information:Copyright © 2007 Elsevier Ltd
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:15065
Deposited On:29 Jan 2010 14:02 by Abdul Olabi. Last Modified 23 Feb 2017 13:47

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