Type

Journal Article

Authors

M. S. J. Hashmi
M. D. Gilchrist
E. Morris
A. G. Olabi
Saleem Hashmi

Subjects

Engineering

Topics
materials energy absorption numerical simulations tubes ansys boundary conditions plastic deformation lateral crushing finite element energy absorber mild steel ls dyna lateral compression quasi static impact energy mechanical engineering

Optimised design of nested oblong tube energy absorbers under lateral impact loading (2008)

Abstract 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.
Collections Ireland -> Dublin City University -> Publication Type = Article
Ireland -> Dublin City University -> Status = Published
Ireland -> Dublin City University -> DCU Faculties and Centres = DCU Faculties and Schools: Faculty of Engineering and Computing: School of Mechanical and Manufacturing Engineering
Ireland -> Dublin City University -> Subject = Engineering: Mechanical engineering
Ireland -> Dublin City University -> Subject = Engineering: Materials
Ireland -> Dublin City University -> Subject = Engineering
Ireland -> Dublin City University -> DCU Faculties and Centres = DCU Faculties and Schools
Ireland -> University College Dublin -> Mechanical & Materials Engineering Research Collection
Ireland -> University College Dublin -> College of Engineering & Architecture
Ireland -> Dublin City University -> DCU Faculties and Centres = DCU Faculties and Schools: Faculty of Engineering and Computing
Ireland -> University College Dublin -> School of Mechanical and Materials Engineering

Full list of authors on original publication

M. S. J. Hashmi, M. D. Gilchrist, E. Morris, A. G. Olabi, Saleem Hashmi

Experts in our system

1
M. D. Gilchrist
University College Dublin
Total Publications: 172
 
2
Abdul-Ghani Olabi
Dublin City University
Total Publications: 55