Crack growth rates in various microstructures of Ti-6Al-4V and commercially pure titanium were studied using modified wedge opening load (WOL) specimens. Data were modeled using a Weibull four parameter survivorship function, selected because it meets the physical boundary conditions. The resulting models were exercised to determine the statistical significance of microstructure on the fatigue crack growth properties of these materials. Finally, inferences concerning gas turbine engine component design are considered.

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