Compressional behaviour of Kevlar fibres

The compressional deformation of poly(p-phenylene terephthalamide) fibres of the Kevlar type has been followed by scanning and transmission electron microscope methods in order to explain changes in mechanical properties

M.G. Dobb; D.J. Johnson; B.P. Saville

2003

Key concepts

Scholarcy highlights

  • The compressional deformation of poly(p-phenylene terephthalamide) fibres of the Kevlar type has been followed by scanning and transmission electron microscope methods in order to explain changes in mechanical properties
  • A structural mechanism describing the mode of deformation is proposed which is based on the initial formation of kink-bands
  • The propagation of the latter appears to be unaffected by the presence of the axially pleated-sheet structure exhibited by Kevlar fibres
  • The proposed mechanism is consistent with an observed loss in tensile strength after compression
  • It is considered that the relatively poor compressional behaviour of aramid-type fibres arises from the weak lateral cohesion between their essentially rigid molecular chains, in agreement with the findings of Greenwood and Rose

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