Fatigue damage propagation in unidirectional glass fibre reinforced composites

Jens Zangenberg Hansen, Vladimir Joel Alzamora Guzman, R.C. Østergaard, Povl Brøndsted

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Damage progression in unidirectional glass fibre reinforced composites exposed to tension fatigue is investigated, and a quantitative explanation is given for the observed stiffness loss. The stiffness degradation during fatigue is directly related to fibre breaks in the load-carrying axial fibre bundles. The underlying mechanisms are examined using digital microscopy, and it is postulated that fatigue damage initiates due to stress concentrations between the backing (transverse) layer and the unidirectional layer, followed by a cyclic fretting and axial fibre debonding. This fretting mechanism needs further attention and understanding in order to improve the fatigue life-time of glass fibre reinforced composites.
Original languageEnglish
Title of host publicationECCM15 - 15th European Conference On Composite Materials
Number of pages8
Publication date2012
Publication statusPublished - 2012
EventECCM15: 15th European Confeernce on Composite Materials - Venica, Italy
Duration: 24 Jun 201228 Jun 2012


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  • Fatigue damage
  • Stiffness degradation
  • Fibre breaks


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