Image icon  Kevlar fibre composite fracture surface

 
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Description: Because a relatively short beam was used, significant shear stresses existed in the beam, and failure has occurred principally by shear. In this mode, the specimen splits longitudinally along planes parallel to its neutral axis, due to shear failure within the matrix and at the weak interface between fibres and matrix. Matrix porosity (and particularly the long longitudinal voids present in this specimen), the poor wetting of fibres by the resin, and poor fibre distribution will all promote failure by shear. However, 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
Keywords: alignment • composite material • epoxy • fibre • fibrillation • fracture • hackle region • Kevlar • liquid crystalline polymer (LCP) • lyotropic • polymer • polymer composite • reinforcement • shear
Categories: Science approaches > Deformation & failure > Fracture
Science approaches > Microstructure
Materials > Hybrids > Composites > Polymer matrix
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: J A Curran, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 03 October 2002
Date added: 21 August 2009
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Resource ID: 1653