Fatigue Crack Propagation Rates in Woven and Nonwoven Fiber Glass Laminates

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Abstract
The characteristics of fatigue crack propagation are described for fiber glass laminates containing woven fabric, woven roving, chopped fiber mat, and unidirectional ply reinforcement. The mode of crack propagation is shown to be a stepwise, ligament by ligament advance of the crack front. The rate of crack propagation is predicted to vary exponentially with the stress intensity factor by an approximate theory based on the fracture toughness, unnotched fatigue life curve, and microstructural characteristics. Good agreement is demonstrated between theory and experiment for each material. The crack growth rate data are normalized to a single relationship for all woven reinforcements, and to a second relationship for nonwoven reinforcements.

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