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Journal of Materials Science

, Volume 29, Issue 3, pp 632–639 | Cite as

Acoustic emission data on delayed damage processes in the vicinity of defects in fibre-reinforced plastics

  • A. P. Tishkin
  • G. N. Gubanova
  • A. M. Leksovski
  • V. E. Yudin
Papers

Abstract

Analysis of the time intervals between acoustic emission (AE) signals in composites makes it possible to study defect mechanisms induced by stress transfer near the previously arisen defect. Unidirectional carbon fibre-reinforced plastics (CFRP) with matrices of different plasticity have been investigated during tensile deformation. There is a characteristic delay time, Τ1 between the correlated appearance of defects. For these materials, Τ1 ranges from 50–500 Μs. In the model considered here, Τ1 is determined by the time for which the zone of plastic deformation formed at the place of fibre breaking and widening during local stress relaxation, is extended to the neighbouring fibres. Thus, the fibre is overloaded, which may lead to its breaking. The effect of viscoelastic properties on Τ1 is discussed. This delay time decreases with the plasticity of the matrix. These data also show that the zone of localized deformation at the broken fibre can cover several layers of neighbouring fibres.

Keywords

Acoustic Emission Stress Relaxation Viscoelastic Property Localize Deformation Emission Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • A. P. Tishkin
    • 1
  • G. N. Gubanova
    • 1
  • A. M. Leksovski
    • 1
  • V. E. Yudin
    • 2
  1. 1.A. F. Ioffe Physical-Technical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Institute of Macromolecular CompoundsRussian Academy of SciencesSt. PetersburgRussia

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