2017 Cx Round Robin

Point of Contact(s): Robert Pilarczyk

Objective: To identify the random and systematic uncertainties associated with Damage Tolerance Analyses (DTA) that incorporate residual stresses produced by Cold Expansion (Cx) of fastener holes. Many factors influencing the total uncertainty have been discussed and are currently under investigation by various members of the ERSI team. For the first round-robin exercise, the focus will be on systematic uncertainties, or the uncertainty associated with the system or process used by the analyst (also known as epistemic uncertainties or model-form uncertainties). Specific input data will be provided to each analyst participating in the exercise to minimize the random uncertainties associated with these types of analyses. The analyst is free to use any means to incorporate the residual stress into the DTA, any software suite, etc., however it’s important that the analyst adheres closely to the guidance so that the variability in the predictions will be limited to the aspects left to analyst’s discretion.

Inputs ERSI - Analysis Methods Subcommittee - Round Robin.docx Residual Stresses.xlsx Results Template.xlsx

Misc Other ERSI Round Robin Stress Intensity Comparisons.xlsx Round Robin Test Data Final.xlsx

Publications Robert Pilarczyk, Ricardo Actis, Joseph Cardinal, Scott Carlson, James Harter, Joshua Hodges, Scott Prost-Domasky, Guillaume Renaud; Successful Round Robin Analyses Resulting from the Engineered Residual Stress Implementation Working Group. Matls. Perf. Charact. 15 October 2020; 9 (5): 744–756. https://doi.org/10.1520/MPC20190210 ICAF 2019 - Summary of Recent Round Robin Life Prediction Efforts for Crack Shape and RS Effects.pdf Robert Pilarczyk - ASIP 2019 Presentation.pdf

Results Key Modeling Factors Summary.pdf Round Robin Predictions and Test Data.xlsx