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Indentation response of a 3D non-woven carbon-fibre composite

Published online by Cambridge University Press:  16 January 2018

Satyajit Das ,
Karthikeyan Kandan ,
Sohrab Kazemahvazi ,
Haydn N.G. Wadley  and
Vikram S. Deshpande
Satyajit Das
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.
Karthikeyan Kandan
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.; and School of Engineering, De Montfort University, Leicester LE1 9BH, U.K.
Sohrab Kazemahvazi
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.
Haydn N.G. Wadley
Affiliation:
Department of Material Science & Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, Virginia 22904, USA
Vikram S. Deshpande*
Affiliation:
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.
*
a)Address all correspondence to this author. e-mail: vsd@eng.cam.ac.uk
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Abstract

The indentation response of a 3D noninterlaced composite comprising three sets of orthogonal carbon-fibre tows in an epoxy matrix is investigated. The 3D composites have a near isotropic and ductile indentation response. The deformation mode includes the formation of multiple kinks in the tows aligned with the indentation direction and shearing of the orthogonally oriented tows. Finite element (FE) calculations are also reported wherein tows in one direction are explicitly modeled with the other two sets of orthogonal tows and the matrix pockets treated as an effective homogenous medium. The calculations capture the indentation response in the direction of the explicitly modeled tows with excellent fidelity but under-predict the indentation strength in the other directions. In contrast to anisotropic and brittle laminated composites, 3D noninterlaced composites have a near isotropic and ductile indentation response making them strong candidates for application as materials to resist impact loading.

Keywords

compositesimulationstructural
Type
Invited Articles
Information
Journal of Materials Research , Volume 33 , Issue 3: Focus Issue: Architected Materials , 14 February 2018 , pp. 317 - 329
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Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Lorenzo Valdevit

References

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