The objective of the reported research is to develop weight-efficient energy absorbing structures for automotive applications. A traditional method in reaching a desired level of energy absorption is to increase the gauge thickness or introduce high strength steel. In the paper, a new approach is proposed by placing ultralight core, such as aluminum honeycomb or foam, inside thin-walled members. The filler is preventing or delaying sectional collapse, thus introducing higher tensile and compressive stresses in the sheet material. The paper summarizes an extensive pilot study recently conducted at MIT. Square prismatic members were chosen for the analysis. Three types of loading were considered: axial compression, planar bending, and torsion. In each case, analytical and numerical solutions were obtained. It was found that substantial increase (100 % or more) of specific energy absorption per unit weight is obtained depending on the crushing strength of the filler and the type of bonding between the skin and the core.
Crush behaviour of box columns filled with honeycombs or foams
1998
13 Seiten, 12 Bilder, 20 Quellen
Conference paper
English
Crush of High Density Aluminum Honeycombs
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