Image icon  Kevlar fibre composite shear surface

 
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Attribution text: By DoITPoMS, J A Curran, released under CC BY-NC-SA 2.0 license
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Description: This is an image of the shear surface in a failed composite beam. 'Hackles' of matrix are clearly visible where shear has occurred within the matrix and it is also clear that shear has occurred across the fibre/matrix interface. The fibres are for the most part totally unscathed, though some mis-aligned fibres have become caught between the shear surfaces and 'fibrillated' by rolling and bending actions. It may be that this failure mechanism has been partly inhibited by poor fibre alignment since some off-axis fibres will reinforce the matrix in shear. It will have been promoted, however, by the extensive longitudinal voids.
Keywords: alignment • composite material • epoxy • fibre • fibrillation • fracture • hackle region • Kevlar • liquid crystalline polymer (LCP) • lyotropic • polymer • polymer composite • reinforcement • shear • displacement • indentation • Plasticine
Categories: Science approaches > Deformation & failure > Fracture
Science approaches > Microstructure
Materials > Hybrids > Composites > Polymer matrix
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
J A Curran, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 03 October 2002
Date added: 21 August 2009
Package: DoITPoMS Micrograph Library
Resource ID: 1655