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Research Papers

The Energy Absorption Characteristics of Square Mild Steel Tubes With Multiple Induced Circular Hole Discontinuities—Part II: Numerical Simulations

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

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

S. Chung Kim Yuen1

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

1

Corresponding author.

J. Appl. Mech 76(4), 041013 (Apr 27, 2009) (10 pages) doi:10.1115/1.3114967 History: Received October 02, 2007; Revised November 02, 2007; Published April 27, 2009

This paper is Part II of a two-part article and presents the results of numerical simulations conducted to investigate the energy absorption characteristics of square tubes subjected to dynamic axial loading. Part I reports the experimental results of both quasistatic and dynamic tests. The validated model is used to study the crushing characteristics of tubes with multiple induced circular hole discontinuities using the finite element package ABAQUS/EXPLICIT version 6.4-6. Holes of diameter 17 mm are used as crush initiators, which are laterally drilled into the tube wall to form opposing hole pairs. Holes of diameters 12.5 mm and 25 mm are also used to assess the effects of hole diameter on energy absorption. Two hole spacing configurations are investigated, one in which the hole pairs are placed at regular intervals of 50 mm along the tube wall and another in which the hole pairs are spaced symmetrically along the tube length. Holes are also drilled on either two or all four opposing tube walls. The number of holes is varied from 2 to 10. The results indicate that the introduction of the holes decreases the initial peak force. However, an increase in the number of holes, beyond two holes, does not further significantly decrease the initial peak force. A study of the crushing history of the tubes reveals that crushing is initiated at the location of the holes. The results also indicate that the type of hole spacing determines how crushing is initiated at the hole locations. The model satisfactorily predicts the resultant collapse shapes but overpredicts the crushed distance.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Finite element analysis model assembly for configuration B6_H50

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Figure 2

Comparison of (a) experimental and (b) simulation crush initiations for configuration B8_H50

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Figure 3

Comparison of (a) experimental and (b) simulation crush initiations for configuration B6_HEq

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Figure 4

Comparison of (a) experimental and (b) simulation crush modes for configuration A4_d17

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Figure 5

Comparison of experimental (a) and simulation (b) crush modes for configuration B4_HEq

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Figure 6

Comparison of (a) experimental and (b) simulation crush modes for configuration B6_HEq

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Figure 7

Comparison of experimental and simulation crush modes for configuration B8_HEq

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Figure 8

Force-displacement curves for A2_d12.5, A2_d17, A2_d25, and a plain tube

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Figure 9

Initiation of buckling for a (a) plain tube and (b) A2_d17

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Figure 10

Difference in size of first lobe between a plain tube and specimen A2_d25

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Figure 11

Force-displacement curves for group A and a plain tube

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Figure 12

Initial transient response for (a) A4_d25 and (b) A8_d25

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Figure 13

Initial transient response for specimen A6_d25

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Figure 14

Force-displacement curves for group B_H50 and a plain tube

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Figure 15

Transient response for B6_H50

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Figure 16

Force-displacement curve for B4_HEq

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Figure 17

Transient response for specimen B4_HEq

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Figure 18

B6_HEq after crushing

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Figure 19

Force-displacement curve for specimen B8_HEq as obtained by FE Analysis

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Figure 20

Transient response for B8_HEq

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Figure 21

Reduction in the initial peak force of a plain tube for specimens of diameter 17 mm

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Figure 22

Crush force efficiency for specimens of diameter 17 mm

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