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Crash performance of cellular foams with reduced relative density part 2: rib deletion.

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Title: Crash performance of cellular foams with reduced relative density part 2: rib deletion.
Authors: Henderson, B.1, Whitty, J. P. M.1 jpw1mpo@bolton.ac.uk, Myler, P.1, Chirwa, C.2
Source: International Journal of Crashworthiness. 2007, Vol. 12 Issue 6, p689-698. 10p. 3 Diagrams, 1 Chart, 5 Graphs.
Subjects: Finite element method, Construction, CAD/CAM systems, Numerical analysis
Abstract: The finite element method has been used to investigate the crashworthiness of regular conventional and re-entrant cellular foams in pristine and defect forms. Defects were introduced by randomly deleting vertical ribs (cell walls), diagonal ribs and vertical-plus-diagonal ribs from the honeycomb models, which with suitable boundary conditions approximated to three-dimensional foams. Generally, the calculations show that deleting ribs leads to a reduction in magnitude of the Young's moduli and Poisson's ratios, although there are some notable exceptions. In particular, the Young's modulus and Poisson's ratio along the x-axis (perpendicular to the vertical ribs) actually increase in magnitude slightly when vertical ribs are deleted. In the case of the re-entrant honeycomb, a transition from auxetic (negative Poisson's ratio) to non-auxetic (positive Poisson's ratio) behaviour occurs at a critical threshold for diagonal rib deletion. For the conventional honeycomb, the Poisson's ratio for loading in the y-direction remains approximately constant when diagonal ribs are deleted. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Crashworthiness is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 35730007
AccessLevel: 6
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  Data: Crash performance of cellular foams with reduced relative density part 2: rib deletion.
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Crashworthiness%22">International Journal of Crashworthiness</searchLink>. 2007, Vol. 12 Issue 6, p689-698. 10p. 3 Diagrams, 1 Chart, 5 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Construction%22">Construction</searchLink><br /><searchLink fieldCode="DE" term="%22CAD%2FCAM+systems%22">CAD/CAM systems</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink>
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  Data: The finite element method has been used to investigate the crashworthiness of regular conventional and re-entrant cellular foams in pristine and defect forms. Defects were introduced by randomly deleting vertical ribs (cell walls), diagonal ribs and vertical-plus-diagonal ribs from the honeycomb models, which with suitable boundary conditions approximated to three-dimensional foams. Generally, the calculations show that deleting ribs leads to a reduction in magnitude of the Young's moduli and Poisson's ratios, although there are some notable exceptions. In particular, the Young's modulus and Poisson's ratio along the x-axis (perpendicular to the vertical ribs) actually increase in magnitude slightly when vertical ribs are deleted. In the case of the re-entrant honeycomb, a transition from auxetic (negative Poisson's ratio) to non-auxetic (positive Poisson's ratio) behaviour occurs at a critical threshold for diagonal rib deletion. For the conventional honeycomb, the Poisson's ratio for loading in the y-direction remains approximately constant when diagonal ribs are deleted. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Crashworthiness is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        Type: general
      – SubjectFull: Construction
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      – SubjectFull: CAD/CAM systems
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      – TitleFull: Crash performance of cellular foams with reduced relative density part 2: rib deletion.
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              Text: 2007
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