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Fibre fragmentation in model composites:the influence of fibre surface treatment

Technische Universiteit Eindhoven
Publication Date
  • Mechanical Engineering: Report Series
  • Materials Science: Report Series
  • Composite Materials (General)
  • Fibre Reinforced Composite Materials
  • Composite Materials - Fracture


Fibre fragmentation in model composites. The influence of fibre surface treatment. B.L. Hogeweg Eindhoven, july 1994 WFW-94.082 Professor: Coaches: Fibre Fragmentation in model composites. The influence of fibre surface treatment. B.L. Hogeweg Eindhoven, july 1994 WFW-94.082 Prof. dr. ir. H.E.H. Meijer Ir. P.W.J. van den Heuvel Dr. ing. AA.J.M. Peijs Eindhoven University of Technology Department of Mechanical Engineering Division of Fundamental Mechanics Centre for Polymers and Composites Objective The objective of this study was to investigate the influence of fibre surface treatment on the failure process of single filament model composites. Summary Single filament model composites were used to investigate the failure mechanism in fibre reinforced materials. Debonding and plastically yielding of the matrix were the most important failure phenomena. To study the influence of the interfacial shear strength on the failure mechanism, carbon fibres with different levels of oxidative surface treatment were used. This treatment improves adhesion between fibre and matrix. The result of this adhesion improvement is that the fragment lengths become shorter. To quantify the adhesion improvement between fibre and matrix, the maximum interfacial shear strength was calculated. There are three models available, which all required the determination of the fibre strength dependency on the gauge length. This is done with the single filament tensile test. This statistical length dependency is described with the Weibull theory. The distribution of the fibre fragment lengths can be satisfactorily described with the Gamma distribution. With the from this distribution deduced critical fibre length and the Weibull description, the fibre strength at the critical length was determined. By observing the fragmentation process, it turned out that none of the models give a physically correct description of the process. The process involves debondi

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