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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 3    March 2018

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Crashworthiness of double-cell conical tubes with different cross sections subjected to dynamic axial and oblique loads
Pirmohammad Sadjad1, Ekbatan Mohammad-Hossein2, Esmaeili-Marzdashti Sobhan1

1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil 179, Iran; 2. Department of Mechanical Engineering, Azad University of Arak, Arak, Iran

Abstract:Thin-walled tubes are increasingly used in automobile industries to improve structural safety. The present work deals with the collapse behavior of double-cell conical tubes subjected to dynamic axial and oblique loads. Crashworthiness of these tubes having different sections (e.g., circular, square, hexagonal, octagonal, decagonal) was numerically investigated by using an experimentally validated finite element model generated in LS-DYNA. Geometry of these tubes was then optimized by decreasing the cross section dimensions at the distal end while the weight remained unchanged. Octagonal conical tube was finally found to be more preferable to the others as a collision energy absorber. In addition, square and circular tubes showed diamond deformation mode, while the other tubes collapsed in concertina mode. A decision making method called TOPSIS was finally implemented on the numerical results to select the most efficient energy absorber.

 

Key words: crashworthiness; dynamic axial and oblique load; double-cell conical tube; mean dynamic load

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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