The effect of percent foam fill ratio on the energy absorption capacity of axially compressed thin-walled multi-cell square and circular tubes


ALTIN M. , GÜLER M. A. , Mert S. K.

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, vol.131, pp.368-379, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 131
  • Publication Date: 2017
  • Doi Number: 10.1016/j.ijmecsci.2017.07.003
  • Title of Journal : INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
  • Page Numbers: pp.368-379
  • Keywords: Crashworthiness, Multi-cell tubes, Energy absorption, Thin-walled structure, Crush force efficiency, Specific energy absorption, MULTIOBJECTIVE CRASHWORTHINESS OPTIMIZATION, CRUSHING ANALYSIS, CONSTITUTIVE MODELS, BITUBAL STRUCTURES, CONICAL TUBES, CRASH BOXES, DESIGN, EXTRUSIONS, COLUMNS, DEFORMATION

Abstract

In this study, the effect of foam fill ratio on the energy absorption capacity of axially compressed thin-walled multi-cell square and circular tubes is investigated. In the experimental study, Aluminum tubes having circular cross-sections with four different foam fill ratio (11.4%, 22.8%, 34.2%, 100%) were subjected to compression tests under quasi-static test conditions. The finite element (FE) models of these tests were prepared and FE analysis were conducted using LS-DYNA program for validation study. After validating the FE models with real experiments, a total of 24 different multi-cell geometries (6 square empty, 6 square with various foam fill ratio, 6 circular empty and 6 circular with various foam fill ratio) were created. A total of three different wall thicknesses were used for each geometry in the explicit dynamic analyses. It is found out that specific energy absorption (SEA) of foam-filled square design is 5 times larger compared to the empty square design which has minimum SEA. By varying the wall thickness, the SEA and crush force efficiency (CFE) performances of the foam-filled square design can be increased by 87% and 42% respectively. The main goal of this study is to find the best multi-cell design having maximum SEA and CFE. (C) 2017 Elsevier Ltd. All rights reserved.