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A finite element model of the fragmentation test for the case of a coated fiber

Tipo de material: TextoTextoSeries ; Composites Science and Technology, 48, p.143-149, 1993Trabajos contenidos:
  • Daoust, J
  • Vu-Khanh, T
Tema(s): Recursos en línea: Resumen: The fiber/matrix interface in composite materials is generally studied by means of the fragmentation test by using a single filament embedded in a polymeric matrix. The average shear strength, 5, of the interface is computed from the well-known shear4ag theory. For the case of a fiber coated with a thin layer of an interphase having a low modulus, a finite element analysis model has been developed to describe the profiles of the tensile and shear stresses along a fiber fragment. The introduction of a soft interlayer decreases the stresses at the ends of the fragment, and as the interlayer thickness increases this effect becomes more important. This model shows the limits of the shear-tag theory and could explain experimental results obtained for the case of an elastomer-coated glass fiber in an epoxy matrix.
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The fiber/matrix interface in composite materials is generally studied by means of the fragmentation test by using a single filament embedded in a polymeric matrix. The average shear strength, 5, of the interface is computed from the well-known shear4ag theory. For the case of a fiber coated with a thin layer of an interphase having a low modulus, a finite element analysis model has been developed to describe the profiles of the tensile and shear stresses along a fiber fragment. The introduction of a soft interlayer decreases the stresses at the ends of the fragment, and as the interlayer thickness increases this effect becomes more important. This model shows the limits of the shear-tag theory and could explain experimental results obtained for the case of an elastomer-coated glass fiber in an epoxy matrix.

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