Title: A parametric study of crush initiators for a thin-walled tube

Authors: C.A. Krauss, D.H. Laananen

Addresses: Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Arizona 85287-6106, USA. ' Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Arizona 85287-6106, USA

Abstract: The structure of a vehicle surrounding the occupant compartment is designed to crush in an accident in order to limit the forces that are transmitted to its occupants. Crush initiators are stress concentrations that are incorporated into automobile frame members to ensure a stable collapse process and to limit peak loads. Using finite element analysis, a parametric study of the effects of crush initiator geometry on peak and mean crush forces of a thin-walled, square steel tube under axially loaded impact conditions was conducted. Three crush initiator shapes were examined: a transverse bead on two sides of the tube cross section, a diamond notch on each of the four comers, and a circular hole on the comers. For each shape, three sizes of initiators were analysed and compared with an unnotched baseline specimen with respect to the peak load and energy absorbed.

Keywords: crash protection; crush initiators; energy absorption; finite element analysis; FEA; thin-walled tubes; vehicle design; vehicle accidents; vehicle collisions; stable collapse; peak loads; steel tubes; crush initiator shapes.

DOI: 10.1504/IJVD.1994.061870

International Journal of Vehicle Design, 1994 Vol.15 No.3/4/5, pp.385 - 401

Available online: 28 May 2014 *

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