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ADVANCES IN IMPACT ENGINEERING

The Crushing Characteristics of Square Tubes With Blast-Induced Imperfections—Part II: Numerical Simulations

[+] Author and Article Information
S. Chung Kim Yuen1

Blast Impact and Survivability Research Unit (BISRU), Department of Mechanical Engineering, University of Cape Town, Private Bag, Rondebosch 7701, South Africasteeve.chungkimyuen@uct.ac.za

G. N. Nurick

Blast Impact and Survivability Research Unit (BISRU), Department of Mechanical Engineering, University of Cape Town, Private Bag, Rondebosch 7701, South Africa

1

Corresponding author.

J. Appl. Mech 76(5), 051309 (Jun 17, 2009) (14 pages) doi:10.1115/1.3005980 History: Received February 03, 2008; Revised July 29, 2008; Published June 17, 2009

This two-part paper presents the results of experimental and numerical work on the crushing characteristics of square tubes, with blast-induced imperfections, subjected to axial load. In Part I, the experimental studies are presented. The approach in the studies involves creating imperfections on opposite sides at midlength of a square tube by means of localized blast loads to create three types of imperfections: nontouching domes, rebound domes, and capped domes. These imperfections change the geometry and the material properties in the midsection of the tubes and hence affect the crushing characteristics. While the blast-induced imperfections enhance the energy absorption characteristics of the tubes they also affect the lobe formation process. In Part II, the finite element package ABAQUS/EXPLICIT v6.5–6 is used to construct a 12 symmetry model by means of shell and continuum elements to simulate the tube response to the localized blast loads followed by dynamic axial loading in the form of a rigid mass impacting at a specified initial velocity. The hydrodynamic code AUTODYN is used to characterize the localized blast pressure time and spatial history. The predictions show satisfactory correlation with experiments for both crushed shapes and crushed distance.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

12 tube finite element (FE) model showing boundary conditions and assigned element type

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Figure 2

Tensile test specimen extraction from the mild steel extrusion

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Figure 3

Graph of true stress versus logarithmic strain

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Figure 4

Axisymmetric schematic of the localized blast of PE4 explosive, using AUTODYN 2D

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Figure 5

Transient response of the tube to two localized blast loads (for all types of imperfections)

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Figure 6

Comparison of tube response to two localized blast loads (for all types of imperfections)

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Figure 7

Predicted collapse mode of a 50 mm square tube with simple Mode I imperfections created by two 25 mm blast loads (drop mass: 210 kg; drop height: 5 m)

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Figure 8

Collapse sequences of a 50 mm square tube with simple Mode I imperfections created by two 25 mm blast loads (drop mass: 210 kg; drop height: 5 m)

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Figure 9

Comparison of predicted collapse mode of a 50 mm square tube with induced rebound imperfections created by two 17 mm blast loads (drop mass: 329 kg; drop height: 3.27 m)

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Figure 10

Collapse sequences of a 50 mm square tube with induced rebound imperfections created by two 17 mm blast loads (drop mass: 329 kg; drop height: 3.27 m)

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Figure 11

Final collapse mode of a 50 mm square tube with rebound induced imperfections created by two 25 mm blast loads (drop mass: 210 kg; drop height: 4 m)

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Figure 12

Final collapse mode of a 50 mm square tube with capping induced imperfections (drop mass: 329 kg; drop height: 3.27 m)

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Figure 13

Collapse sequences of a 50 mm square tube with induced capping imperfections (drop mass: 329 kg; drop height: 3.27 m)

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Figure 14

Comparison of predicted collapse mode of a 50 mm square tube with induced capping imperfections created by two 17 mm blast loads (drop mass: 329 kg; drop height: 3.27 m)

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Figure 15

Crushed 50 mm tubes with asymmetric blast response

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Figure 16

12 tube FE model showing different loading conditions

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Figure 17

Predicted collapse mode of a 50 mm square tube with blast-induced asymmetric imperfections

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Figure 18

Predicted blast-induced imperfections for a 50 mm tube at various impulses

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Figure 19

Predicted deformation profile along central longitudinal axis of a 50 mm tube at various impulses

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Figure 20

Predicted buckling shapes for dynamic axially loaded 50 mm tubes with imperfections induced by different blast loads

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Figure 21

Predicted axial force-displacement curves for some dynamic axial load of 50 mm square tubes with imperfections induced by different blast loads

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