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Stiffness and strength degradation of damaged truss core composites

Siska, Filip, Tawfeeq, Arwa F., Dlouhy, Ivo and Barnett, Matthew R. 2015, Stiffness and strength degradation of damaged truss core composites, Composite structures, vol. 125, pp. 287-294, doi: 10.1016/j.compstruct.2015.02.019.

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Title Stiffness and strength degradation of damaged truss core composites
Author(s) Siska, Filip
Tawfeeq, Arwa F.
Dlouhy, Ivo
Barnett, Matthew R.ORCID iD for Barnett, Matthew R. orcid.org/0000-0001-8287-9044
Journal name Composite structures
Volume number 125
Start page 287
End page 294
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015
ISSN 0263-8223
Keyword(s) Finite element
High temperature tests
Strain rate
Truss core composites
Science & Technology
Technology
Materials Science, Composites
Materials Science
STRUCTURAL PERFORMANCE
SANDWICH
PLATES
Summary Truss core laminates display stiffness and strength/density ratios superior to those seen in foam cored laminates. However, this superiority is held only for ideal shaped struts. If the truss core is damaged, its performance rapidly decreases towards that of a foam. The present study investigates the stiffness and strength degradation with imposed core deformation/damage. This is done for a pyramidal core structure made by electro-discharge machining from AA5083 alloy. The experiments are compared with finite element predictions. The effect of the strain rate sensitivity is studied by performing the tests at different temperatures and by FE simulations with different material data sets. The results show reasonable agreement between experiments and modeling. The stiffness of a damaged truss core rapidly degrades and reaches the performance levels seen in foams after ≈8% of deformation. The results show that a high strain rate sensitivity significantly influences post-buckling core behavior and is able to decrease the stiffness and strength degradation rate.
Language eng
DOI 10.1016/j.compstruct.2015.02.019
Field of Research 091202 Composite and Hybrid Materials
091207 Metals and Alloy Materials
Socio Economic Objective 861206 Structural Metal Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30074230

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Fri, 28 Aug 2015, 13:09:24 EST

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