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TECHNICAL PAPERS

Quasi-Static Biaxial Plastic Buckling of Tubular Structures Used as an Energy Absorber

[+] Author and Article Information
R. Baleh

L3M, Université Paris 8, IUT de Tremblay, 93290 Tremblay-en-France, France

A. Abdul-Latif1

L3M, Université Paris 8, IUT de Tremblay, 93290 Tremblay-en-France, Franceaabdul@iu2t.univ-paris8.fr

1

Corresponding author.

J. Appl. Mech 74(4), 628-635 (May 24, 2006) (8 pages) doi:10.1115/1.2424470 History: Received November 27, 2005; Revised May 24, 2006

The aim of this experimental study is to improve the energy absorption capacity of tubular metallic structures during their plastic buckling by increasing the strength properties of materials. Based on a novel idea, a change in the plastic strength of materials could be predictable through the loading path complexity concept. An original experimental device, which represents a patent issue, is developed. From a uniaxial loading, a biaxial (combined compression–torsion) loading path is generated by means of this device. Tests are carried out to investigate the biaxial plastic buckling behavior of several tubular structures made from copper, aluminum, and mild steel. The effects of the loading path complexity, the geometrical parameters of the structures, and loading rates (notably the tangential one) on the plastic flow mechanism, the mean collapse load, and the energy absorbed are carefully analyzed. The results related to the copper and aluminum metals show that the plastic strength properties of the tubes crushed biaxially change with the torsional component rate. This emphasizes that the energy absorption improves with increasing the applied loading complexity. However, the energy absorbed data for the mild steel tubular structures do not demonstrate the same sensitivity to the quasi-static loading path complexity.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Brief view of the ACTP device

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Figure 2

Friction effect estimation within the ACTP device

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Figure 12

Variation of the mean load for each fold occurring during copper tubes collapse under different biaxial (0deg, 30deg, 37deg, and 45deg) loadings

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Figure 3

Typical examples of the deformation modes related to the copper specimens having: (i) η=15.5 and (ii) η=19.5 with different crushing types: (a) free-ends (DM); (b) biaxial-0deg (AM); (c) biaxial-30deg (AXM); (d) biaxial-45deg (XM); and (e) biaxial-37deg (XM)

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Figure 4

Deformation modes concerning the aluminum specimens during their collapse under various loading paths: (a) free-ends (AXM); (b) biaxial-0deg (AXM); (c) biaxial-30deg (XM); (d) biaxial-37deg (DM); and (e) biaxial-45deg (DM)

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Figure 5

Deformation modes of the collapsed mild steel specimens under various crushing types: (a) free-ends (DM); (b) biaxial-0deg (DM); (c) biaxial-30deg (XM); (d) biaxial-37deg (DXM); and (e) biaxial-45deg (DXM)

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Figure 6

Photos showing the deformation mode progression under the biaxial-45deg case for the copper tubular structure having η=15.5 and λ=0.11

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Figure 7

Loading rate effect on the collapse loading evolution versus the axial deflection for the copper tubes in biaxial-37deg case

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Figure 8

Evolution of: (a) collapse load; and (b) energy absorbed versus the axial deflection for the copper tubes in uniaxial (free-ends) and biaxial-30deg cases

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Figure 9

Evolution of: (a) collapse load; and (b) energy absorbed versus the axial deflection for the copper tubes (η=15.5) in biaxial (0deg, 30deg, 37deg, and 45deg) cases

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Figure 10

Comparison of the (a) load and (b) energy absorbed evolutions during crushing process: under biaxial loadings (0deg, 30deg, and 45deg) for the aluminum tubes

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Figure 11

Plots of the (a) load and (b) energy absorbed evolutions during crushing process: under biaxial loadings (0deg, 30deg, and 45deg) for the mild steel tubes

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