Effects of Position and Cut-Out Lengths on the Axial Crushing Behavior of Aluminum Tubes: Experimental and Simulation

Authors: B. Käfer, V. K. Bheemineni, H. Lammer, M. Kotnik, F. O. Riemelmoser

Abstract:

Axial compression tests are performed on circular tubes made of Aluminum EN AW 6060 (AlMgSi0.5 alloy) in T66 state. All the received tubes have the uniform outer diameter of 40mm and thickness of 1.5mm. Two different lengths 100mm and 200mm are used in the analysis. After performing compression tests on the uniform tube, important crashworthy parameters like peak force, average force, crush efficiency and energy absorption are measured. The present paper has given importance to increase the percentage of crush efficiency without decreasing the value energy absorption of a tube, so a circumferential notch was introduced on the top section of the tube. The effects of position and cut-out lengths of a circumferential notch on the crush efficiency are well explained with relative deformation modes and force-displacement curves. The numerical simulations were carried on the software tool ANSYS/LS-DYNA. It is seen that the numerical results are reasonably good in agreement with the experimental results. 

Keywords: Crash box, Notch triggering, Energy absorption, FEM simulation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1088810

References:

[1] Alexander JM, “An Approximate Analysis of the Collapse of Thin Cylindrical Shells under Axial Loading”. Quarterly Journal. of Mechanics & Applied Maths,1960
[2] Alghamdi AAA, “Collapsible impact energy absorbers: an overview”, in The Journal of Thin-Walled Structures, vol 39, No.2, 2001, pp.189–213
[3] Andrews, K. R. F., England, G. L. & Ghani, E. “Classification of the axial collapse of cylindrical tubes under quasi-static loading”. International Journal of Mechanical Sciences, 1983
[4] S.R. Guillow, G. Lu, R.H. Grzebieta. “Quasi-static axial compression of thin-walled circular aluminium tubes”; International Journal of Mechanical Sciences, 2001
[5] H. R. Zarei, M. Kröger, “Multiobjective crashworthiness optimization of circular aluminum tubes”, In The Journal of Thin-Walled Structures, vol 41, No.3, 2006, pp. 301–308
[6] P.A.R. Rosa, J.M.C. Rodriques, P.A.F Martins, “External inversion of thin-walled tubes using a die: experimental and theoretical investigation”, in The International Journal of Machine Tools & Manufacture, vol 43, No.8, 2003, pp.787-796
[7] P.A.R. Rosa, J.M.C. Rodriques, P.A.F Martins, “Internal inversion of thin-walled tubes using a die: experimental and theoretical investigation”, in The International Journal of Machine Tools & Manufacture, vol 44, No.7-8, 2004, pp.775-784
[8] V. K. Bheemineni, B. Käfer, H. Lammer, M. Kotnik, and F. O. Riemelmoser,“ Energy Absorption and Axial Tearing Behaviour of Metallic Tubes Using Angled Dies: Experimental and Numerical Simulation” in The World Academy of Science, Engineering and Technology, 79, 2013,pp-625-629
[9] ANSYS/LS-DYNA user’s guide 2009. ANSYS Inc., USA
[10] Frank Ratter, Dennis Lueddeke, Shyh-Chour Huang, “Finite Element Analysis of the Lateral Crushing Behavior of Segmented Composite Tubes”; in The Journal of Engineering Technology and Education, vol 6, No.1, 2009, pp.1-16