Micromechanical characterisation of fibre/matrix interfaces

Li Min Zhou, Jang Kyo Kim, Yiu Wing Mai

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Theoretical analyses for the single fibre pull-out and push-out models under monotonic loading are given which are based on a shear-lag analysis in a fracture mechanics approach considering non-constant friction at the debonded interface as a result of fibre Poisson contraction (or expansion). The solutions allow the determination of typical fibre/matrix interfacial properties such as the interfacial fracture toughness, Gic, the coefficient of friction, μ, and the residual clamping stress, q0. Under cyclic loading the interfacial properties are expected to degrade as a result of repetitive abrasion, and a power law function is assumed between μ and the number of elapsed cycles, N. However, Gic is assumed to be unaffected and a fracture mechanics based debond criterion is derived for the relationship between the external applied stress, the debond length and the reduced friction coefficient for both fibre pull-out and fibre push-out. In addition, the relative displacements between the free fibre end and the matrix top are obtained for cyclic fatigue when the fibre is loaded and unloaded. A relationship obtained for the protrusion (or intrusion) length in fibre pull-out (or push-out) experiments allows the severity of the interface frictional degradation to be evaluated and characterised. Similarities and differences in the frictional degradation behaviour between fibre pull-out and push-out are also identified.

Original languageBritish English
Pages (from-to)227-236
Number of pages10
JournalComposites Science and Technology
Issue number1-4
StatePublished - 1993


  • cyclic loading
  • fibre pull-out
  • fibre push-out
  • frictional degradation
  • interfacial properties
  • monotonic loading


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