Abstract
The constant fatigue life (CFL) diagrams for a unidirectional (UD) CFRP laminate in its in-plane principal directions are identified. First, constant amplitude fatigue tests were performed at various stress ratios in the longitudinal, transverse and shear-dominated off-axis directions, respectively. On the basis of the fatigue test data, the constant fatigue life diagrams for the UD CFRP laminate subjected to longitudinal, transverse and in-plane shear loading are identified. While the shape of the CFL diagram for longitudinal loading is similar to that observed so far for multidirectional CFRP laminates, a significant difference is observed in the shapes of the CFL diagrams for transverse and in-plane shear loading. Finally, a modified CFL diagram is developed to improve the accuracy of prediction of the transverse and in-plane shear CFL diagrams for the unidirectional composite.
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