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Research Papers

The Energy Absorption Characteristics of Square Mild Steel Tubes With Multiple Induced Circular Hole Discontinuities—Part I: Experiments

[+] Author and Article Information
S. B. Bodlani, G. N. Nurick

Blast Impact and Survivability Research Unit (BISRU), Department of Mechanical Engineering, University of Cape Town, Private Bag, Rondebosch, 7700, South Africa

S. Chung Kim Yuen1

Blast Impact and Survivability Research Unit (BISRU), Department of Mechanical Engineering, University of Cape Town, Private Bag, Rondebosch, 7700, South Africasteeve.chungkimyuen@uct.ac.za

1

Corresponding author.

J. Appl. Mech 76(4), 041012 (Apr 27, 2009) (11 pages) doi:10.1115/1.3114971 History: Received October 02, 2007; Revised November 02, 2007; Published April 27, 2009

This two-part article reports the results of experimental and numerical works conducted on the energy absorption characteristics of thin-walled square tubes with multiple circular hole discontinuities. Part I presents the experimental tests in which dynamic and quasistatic axial crushings are performed. The mild steel tubes are 350 mm in length, 50 mm wide, and 1.5 mm thick. Circular hole discontinuities, 17 mm in diameter, are laterally drilled on two or all four opposing walls of the tube to form opposing hole pairs. The total number of holes varies from 2 to 10. The results indicate that the introduction of holes decreases the initial peak force but an increase in the number of holes beyond 2 holes per side does not further significantly decrease the initial peak force. The findings show that strategic positioning of holes triggers progressive collapse hence improving energy absorption. The results also indicate that the presence of holes may at times disrupt the formation of lobes thus compromising the energy absorption capacity of the tube. In Part II, the finite element package ABAQUS /EXPLICIT version 6.4–6 is used to model the dynamic axial crushing of the tubes and to investigate the action of the holes during dynamic loading at an impact velocity of 8 m/s.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test specimen configurations

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Figure 2

Photographs of quasistatically crushed tubes, which collapsed in (a) MM and (b) PS modes

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Figure 3

(a) Photographs of the quasistatic crushing of specimen SA2_d12.5_1; (b) force-displacement curve for the quasistatic crushing of specimens SA2_d12.5_1 and splain_tube-2

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Figure 4

Photographs of the transient quasistatic crushing of specimen SA2_1

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Figure 5

Photographs of the transient quasistatic crushing of specimen SA4_1

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Figure 6

Photographs of specimens SA4_1 and SA4–2 at the end of quasistatic crushing

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Figure 7

Photographs of the transient quasistatic crushing of specimen SB6_H50_1

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Figure 8

Photographs of the transient quasistatic crushing of specimen SB10_H50_1

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Figure 9

Photographs of specimens (a) SB4_HEq_1 and (b) SB6_HEq_1 at the end of quasistatic crushing

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Figure 10

Force-displacement curve for the quasistatic crushing of specimen SB8_HEq_1

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Figure 11

Photographs of the transient quasistatic crushing of specimen SB8_HEq_1

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Figure 12

Photographs of specimens (a) DA4_4, (b) DA4–1, and (c) DA4_3 after loading at heights of 2.5 m, 3.3 m, and 4 m, respectively

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Figure 13

Photographs of specimens (a) DA6_3, (b) DA6_1, and (c) DA6_2 after load at heights of 2.5 m, 3.3 m, and 4 m, respectively

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Figure 14

Photographs of specimens of group B-H50 after loading at heights of (a) 2.5 m and (b) 3.3 m

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Figure 15

Photographs of specimens of configuration B6_H50 after loading at a height of 3.3 m

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Figure 16

Photographs of specimens of configuration B4_HEq after loading at heights of (a) 2.5 m and (b) 3.3 m

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Figure 17

Photographs of specimens of configuration B6_HEq after loading at heights of (a) 2.5 m, (b) 3.3 m, and (c) 4 m

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Figure 18

Photographs of specimens of configuration B8_HEq after loading at a height of 3.3 m

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Figure 19

Photograph of specimen DB6_HEq_3 after loading at a height of 4 m

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Figure 20

Reduction in initial peak force for specimens of groups A, B_ HEq, and B_H50 crushed quasistatically

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Figure 21

Crush force efficiency for groups B_H50 and B_HEq for specimens crushed quasistatically

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