材料期刊网

In an experimental investigation of the pull-out of synthetic fibres with branched structure, it was generally observed that the force and energy of fibre pull-out are greater than those for plain fibres, and increase with the branching angle. An approximate theory of pull-out of fibres with branched structure from a matrix is developed with the aim of quantifying the effect of the branched structure of the fibre. This theory agrees well with the experimental results by adjusting the snubbing friction coefficient between fibre and matrix and neglecting the bending of the fibre at the fibre branching point. The strength and fracture toughness of a composite reinforced by this type of fibre are inferred to be greater than those of composites reinforced with plain fibres.