Analysis & Test

Welcome to the ERSI Analysis & Test committee website. A list of the current and previous round robin activities are listed below, along with all the associated files available for download.

Stress Intensity Factor Round Robin (2021)

Objective: The primary objective of the Stress Intensity Factor (SIF) round robin was to evaluate differences between available SIF solutions for a single corner crack at a fastener hole with remote uniform tension loading. The evaluations included not only the root SIF solution but any corrections to account for single vs multiple cracks, finite width, and hole offset. These solutions were compared to explicit Finite Element Analysis (FEA) results of each case. Any findings were intended to drive improvements to solutions available to the fracture mechanics community.

ASIP Conference Presentation_ERSI SIF Round Robin.pdf ERSI-2021-01 Stress Intensity Comparison Round Robin & Data.pdf ERSI-2021-01 Stress Intensity Comparison Round Robin.pdf ICAF2023_ERSI_Final.pdf SIF Round Robin Data Summary.xlsx Cross-Comparisons of Stress Intensity Factors from Various Sources - The Pathway to Improved SIF Solutions.pdf SIF Comparison matrix - ERSI Round Robin.pdf

AFGROW Workshop Round Robin (2017)

Objective: The purpose of this round robin exercise is to determine the variability of users, given the same loading spectrum, material data, and Initial Flaw Size (IFS) to predict the evolution of the crack front shape and the total life of a given geometry using the AFGROW framework as the life prediction tool. Certain aspects of the AFGROW framework will be provided for common use by each participant, and others will be left to the user's discretion. It is important that each participant follow this guidance so that variability in the predictions is limited to the aspects left to user discretion.

AFGROW Workshop Round Robin.pdf AFGROW Round Robin Questionnaire.pdf Tom Mills-Scott-Fawaz AFGROW Round Robin Corner Crack at Center and Offset Hole - AFGROW Workshop 2017.pdf Prediction Results Template.xlsx Crack History Correlation.xlsx Marker-Data.zip Spectrum.zip

ERSI Original Cx Round Robin (2017)

Objective: Recent discussions within the ERSI Analysis Methods Subcommittee have identified a need to perform a series of round-robin exercises. Of particular focus is 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, which will be described herein, 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 (defined below) 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 in this document 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 E08-ASTM-ESIS-Pilarczyk 2020 successful round robin analyses resulting from the ERSI working group.pdf 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