Quasi-unidirectional glass fibre non crimp fabric composites are routinely used in wind
energy applications. An important factor to consider in this type of application is the
fatigue behaviour of the materials. The present paper gives an overview of the current
approach to material fatigue testing and design in the wind energy industry, as well as a
review of available material data for the fatigue of unidirectional glass fibre
composites. Both “pure” unidirectional and quasi-unidirectional (NCF-based) materials are
considered.