Abstract
Debond growth at the fiber/matrix interface caused by loading transverse to the fiber axis is analysed by the boundary-element method with the possibility of taking into account contact between fiber and matrix. Experimentally observed debonds that are typically much larger in the axial direction than in the arc direction are modeled as arc cracks under plane-strain conditions in a linear elasticity formulation. As a result of the geometrical configuration of the crack with respect to the load, the debonded zone is closed for large crack arc sizes, the interface failure occurring in a pure shear mode. Debond growth in the arc direction is analysed by an energy-balance criterion and the strain-energy release rate is calculated by using Irwin's crack-closure technique.Predicted debond size versus applied load relationships are compared with experimental data for two glass-fiber/epoxy systems and the critical strain-energy release rate of the interface in shear, Gc, is determined. The applicability of a simple analytical failure model, used for data reduction, is also discussed.
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