Three-dimensional numerical modelling of discontinuous fibre composite architectures

Abstract

A three-dimensional geometrical model is presented for generating discontinuous random fibre architectures consisting of high filament count bundles. The fibre network model randomly distributes fibre bundles in a three-dimensional volume using a non-contact algorithm, together with Catmull–Rom spline interpolation, to provide a physically representative material. Only the spines of the fibre bundles are modelled, using truss elements to permit high fibre volume fractions of up to 60%, with no restriction on the fibre bundle aspect ratio. ABAQUS/Standard is used to predict the tensile performance for coupons with varying levels of out-of-plane fibre curvature. The effect of fibre curvature was found to be insignificant for tensile modulus, but a 34% reduction in ultimate tensile strength (UTS) was observed when adjusting the maximum permissible out-of-plane angle of fibres from 1 to 35°. A novel method for characterising the degree of out-of-plane fibre curvature within experimental test coupons is also discussed.

Keywords:

• Discontinuous
• Modelling
• Random
• Finite element
• Carbon fibre

This research was conducted as part of the RAYCELL project and funded by Bentley Motors Ltd. The authors would like to acknowledge A. Dodworth and his team from the ‘New Technology Division’ at Bentley Motors Ltd for their continued support.

Notes

This paper is part of a special issue on Latest developments in research on composite materials