Hill Engineering has recently published a study evaluating the use of statistically defined residual stress fields from cold expansion of fastener holes to quantify the variability of the residual stress and to understand the expected variability in fatigue crack growth predictions.
The study considered 2024-T351 aluminum plate conditions with a centered and offset cold expanded hole. Fatigue crack growth test data from a previous study were used for comparison against the linear elastic multi-point fracture mechanics models developed using BAMpF®. For the conditions studied, the results demonstrated that a statistical representation of the residual stress can provide a significant improvement in predicted fatigue life while still remaining conservative relative to representative fatigue test data.
You can read the full text from the publication here.