Abstract
A modified multi-scale fatigue crack growth rate model for titanium alloy TC4 is provided in this investigation. The model gives a unified expression to evaluate the crack growth rate from MSC to LC stage by incorporating the effects of crack closure, large-scale yielding, and microstructural dissimilitude on crack growth behavior. Results show that the present model is able to describe the multi-scale crack growth rate for titanium alloy TC4. The model concurrently considers the grain size distribution and can reflect the large fluctuation of small-crack growth rate to some extent. Additionally, through integrating the multi-scale crack growth rate model, the crack growth life of TC4 can also be evaluated. The present model has a good prediction ability for the crack growth life and the residual fatigue life of TC4.
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