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The Response of “Large” Square Tubes (Width/Thickness Ratio > 45) to Opposite Lateral Blast Loads Followed by Dynamic Axial Load

  • S. Chung Kim Yuen
  • G. N. Nurick
Conference paper
Part of the IUTAM BookSeries book series (IUTAMBOOK, volume 11)

Abstract

Experiments and Finite Element analyses are carried out to investigate the response of a square tube with width/thickness ratio (C / H) > 45 to two opposite lateral blast loads followed by dynamic axial load. The localised blast loads on opposite sides of 76 × 76 × 1.6 mm square tubes at mid-length create imperfections (triggers) that change the geometry and the material properties of the tube in the mid-section. The effects of the imperfections on the energy absorption characteristics of the tubular structure are investigated by means of the dynamic axial load. Similar studies have been carried out for tubes with C / H ratio of 33 [1–3]. In contrast to the tubes with C / H ratio of 33 where the lobe formation are regular in shape and size, the tubes with C / H ratio > 45 exhibit irregular lobe formation.

The Finite Element package ABAQUS/Explicit v6.5-6 is used to construct a 1/2 symmetry model using shell and continuum elements to simulate the tube response to the two loading conditions. The hydro-dynamic code AUTODYN is used to characterise the localised blast pressure spatial history. The Finite element simulations show satisfactory correlation with experiments for both crushed shapes.

Key words

crashworthiness energy absorbers tube crushing triggers imperfections 

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Copyright information

© Springer Science+Business Media B.V 2008

Authors and Affiliations

  • S. Chung Kim Yuen
    • 1
  • G. N. Nurick
    • 1
  1. 1.Blast Impact and Survivability Research Unit (BISRU), Department of Mechanical EngineeringUniversity of Cape TownRondeboschSouth Africa

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