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| 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. | | Welcome to the ERSI Analysis & Test Committee website. |
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| |style="background-color:#f9540e; text-align:center; vertical-align:middle; font-size: 16px" |'''Stress Intensity Factor Round Robin (2021)'''
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| | style="text-align:left'" | '''''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.''
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| *[https://residualstress.org/images/3/38/ASIP_Conference_Presentation_ERSI_SIF_Round_Robin.pdf ASIP Conference Presentation_ERSI SIF Round Robin.pdf]
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| *[https://residualstress.org/images/9/92/ERSI-2021-01_Stress_Intensity_Comparison_Round_Robin_-_Report_%26_Data.pdf ERSI-2021-01 Stress Intensity Comparison Round Robin & Data.pdf]
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| *[https://residualstress.org/images/0/0c/ERSI-2021-01_Stress_Intensity_Comparison_Round_Robin_r0vf.pdf ERSI-2021-01 Stress Intensity Comparison Round Robin.pdf]
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| *[https://residualstress.org/images/6/6c/ICAF2023_ERSI_Final.pdf ICAF2023_ERSI_Final.pdf]
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| *[https://residualstress.org/images/c/c3/SIF_Round_Robin_Data_Summary_r0vf.xlsx SIF Round Robin Data Summary.xlsx]
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| *[https://residualstress.org/images/3/3b/Pathway_to_Improved_SIF_Solutions_r0vf.pdf Cross-Comparisons of Stress Intensity Factors from Various Sources - The Pathway to Improved SIF Solutions.pdf]
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| *[https://residualstress.org/images/3/3b/SIF_Comparison_matrix_-_ERSI_Round_Robin.pdf SIF Comparison matrix - ERSI Round Robin.pdf]
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| |style="background-color:#f9540e; text-align:center;vertical-align:middle;font-size: 16px " |'''AFGROW Workshop Round Robin (2017)'''
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| |'''''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.''
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| *[https://residualstress.org/images/9/91/AFGROW_Workshop_Round_Robin.pdf AFGROW Workshop Round Robin.pdf]
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| *[https://residualstress.org/images/0/0f/AFGROW_Round_Robin_Questionnaire.pdf AFGROW Round Robin Questionnaire.pdf]
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| *[https://residualstress.org/images/b/bb/Tom_Mills-Scott-Fawaz-AFGROW-Round-Robin-Corner-Crack-at_Center-and-Offset-Hole-AFGROW-5_3-Workshop-2017.pdf Tom Mills-Scott-Fawaz AFGROW Round Robin Corner Crack at Center and Offset Hole - AFGROW Workshop 2017.pdf]
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| *[https://residualstress.org/images/2/23/Prediction_Results_Template.xlsx Prediction Results Template.xlsx]
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| *[https://residualstress.org/images/d/d2/Crack_History_Correlation.xlsx Crack History Correlation.xlsx]
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| *[https://residualstress.org/images/7/73/MARKER-DATA.zip Marker-Data.zip]
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| *[https://residualstress.org/images/9/91/Spectrum.zip Spectrum.zip]
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| |}
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| |style="background-color:#f9540e; text-align:center;vertical-align:middle; font-size: 16px" | '''Cx Round Robin (2017)'''
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| |'''''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.''
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| |'''Inputs'''
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| * [https://residualstress.org/images/e/ee/ERSI_-_Analysis_Methods_Subcommittee_-_Round_Robin_Final_rev1.docx ERSI - Analysis Methods Subcommittee - Round Robin.docx]
| | A list of the current and previous round robin activities are listed below, which will link to the corresponding site with all the associated files available for download. |
| * [https://residualstress.org/images/a/a5/Residual_Stresses.xlsx Residual Stresses.xlsx]
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| * [https://residualstress.org/images/e/e2/Results_Template.xlsx Results Template.xlsx]
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| |'''Misc Other'''
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| * [https://residualstress.org/images/9/9e/ERSI_Round_Robin_Stress_Intensity_Comparisons_r0v1.xlsx ERSI Round Robin Stress Intensity Comparisons.xlsx] | | * 2025 A-10 Cx [https://residualstress.org/images/b/bd/A-10_Cx_Dataset_-_ERSI_Blind_Predictions_r2vf.pptx Dataset] |
| * [https://residualstress.org/images/7/7c/Round_Robin_Test_Data_Final.xlsx Round Robin Test Data Final.xlsx] | | * [[2023 Boeing IRAD Testing|'''2023 Boeing IRAD Testing''']] |
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| | * '''[[2023 Validation of Fatigue Crack Growth Modeling Solutions using Measurements Collected on API X65 Piping Specimens]]''' |
| |'''Publications'''
| | * '''[[2022 Interference Fit Fastener Round Robin]] ''(in-work)''''' |
| | * '''[[2022 Walker-Newman IRAD|2022 Walker/Newman IRAD]] ''(in-work)''''' |
| | * '''[[2022 Cx Variability Round Robin]]''' |
| | * '''[[2022 Boeing Spectrum Challenge]]''' |
| | * '''[[2021 Stress Intensity Factor Round Robin]]''' |
| | * '''[[2021 AFGROW Workshop Round Robin]]''' |
| | * '''[[2019 DST Assist Wide Plate Spectrum Challenge]]''' |
| | * '''[[2019 Interference Fit Fastener Round Robin]]''' |
| | * '''[[2017 Cx Round Robin]]''' |
| | * '''[[2017 AFGROW Workshop Round Robin]]''' |
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| * [https://residualstress.org/images/c/c1/E08-ASTM-ESIS-Pilarczyk_2020_successful_round_robin_analyses_resulting_from_the_ERSI_working_group.pdf E08-ASTM-ESIS-Pilarczyk 2020 successful round robin analyses resulting from the ERSI working group.pdf]
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| * [https://residualstress.org/images/6/68/ICAF_2019_-_Summary_of_Recent_Round_Robin_Life_Prediction_Efforts_for_Crack_Shape_and_RS_Effects.pdf ICAF 2019 - Summary of Recent Round Robin Life Prediction Efforts for Crack Shape and RS Effects.pdf]
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| * [https://residualstress.org/images/5/51/Robert_Pilarczyk_ASIP_2019_Presentation_r1v1.pdf Robert Pilarczyk - ASIP 2019 Presentation.pdf]
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| |'''Results'''
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| * [https://residualstress.org/images/a/ae/Key_Modeling_Factors_Summary.pdf Key Modeling Factors Summary.pdf]
| | Members of the Analysis & Test Committee have organized crack growth rate data from the AFGROW Material Database (AFMAT) for 5 aluminum alloys in lab air (LA), dry air (DA), and low humidity air (LHA) conditions. Those data are available for download using the links below. |
| * [https://residualstress.org/images/d/d9/Round_Robin_Predictions_and_Test_Data_r1v1.xlsx Round Robin Predictions and Test Data.xlsx]
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| |'''IFF Round Robin (2022)'''
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| |'''''Objective:''' Interference Fit Fasteners (IFF) is a key analysis focus area within ERSI based on the complex nature of the problem and the common interaction with cold expanded fastener holes. The accuracy of stress intensity factors and crack growth predictions for IFF conditions is highly dependent on the accuracy of the stress analysis. As such, an initial step for the IFF Working Group, herein referred to as Phase I, involves a series of round-robin stress analysis cases based upon a planned series of experiments. This provides a unique opportunity to evaluate differences between working group members’ process simulation techniques against a well-studied physical test. The primary objective of this Phase I is to establish a set of reference stress analyses agreed upon by the working group, as well as establish the baselines stress state that can be utilized for follow-up phases. Additionally, the analyses can be utilized to characterize:''
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| ''1. The onset of plastic deformation and the bounds of elastic vs. plastic regimes''
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| ''2. The relationship between far field loading and local strain cycles''
| | * [https://residualstress.org/images/6/69/AFMAT_AA2024T3.xlsx 2024-T3, -T351] |
| | * [https://residualstress.org/images/7/75/AFMAT_AA2024T3511.xlsx 2024-T3511] |
| | * [https://residualstress.org/images/2/23/AFMAT_AA7075T6.xlsx 7075-T6, -T651] |
| | * [https://residualstress.org/images/9/9c/AFMAT_AA7075T73.xlsx 7075-T73] |
| | * [https://residualstress.org/images/d/d7/AFMAT_AA7175T74.xlsx 7175-T74] |
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| ''3. The stress state dependency as a function of key factors (e.g. interference level, modeling assumptions, remote loading)''
| | A Cx-related literature review summary has been compiled and can be accessed here: [https://residualstress.org/images/f/f6/Cx_Hole_Literature_Combined.xlsx Cx Literature Review Summary] |
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| ''It is desired that each round-robin participant provides a response to this Round Robin by using their own standard/best practices for process simulation analysis of interference fit fasteners for the defined conditions. This document should provide participants with data sufficient to define the problem, as well as the desired outputs for comparison with other round robin participants, and the coupon experimental results. Besides the necessary data needed for process simulation input, no guidance for accomplishing the process simulations is provided.''
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| | The Analysis & Test Committee has also formed sub-groups within the committee to address specific focus areas, which can be found here: [[Sub-groups]] |
| |'''Inputs'''
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| * [https://residualstress.org/images/c/cc/ERSI_-_Analysis_Methods_Subcommittee_-_Interference_Fit_Fastener_Phase_I_Round_Robin_Problem_v4.docx ERSI - Analysis Methods Subcommittee - Interference Fit Fastener Phase I Round Robin Problem v4.docx]
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| * [https://residualstress.org/images/f/f4/ERSI_IFF_Round_Robin_Results_Template_Group_1_v1.xlsx ERSI IFF Round Robin Results Template_Group 1_v1.xlsx]
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| |'''Submissions'''
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| * [https://residualstress.org/images/f/f4/IFF_Group1_-10ksi_Summary_r1v0.xlsx IFF_Group1_-10ksi_Summary_r1v0.xlsx]
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| * [https://residualstress.org/images/6/61/IFF_Group1_30ksi_Summary_r1v0.xlsx IFF_Group1_30ksi_Summary_r1v0.xlsx]
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| * [https://residualstress.org/images/8/8f/IFF_Group2_0.3%25_Summary_r0v1.xlsx IFF_Group2_0.3%_Summary_r0v1.xlsx]
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| * [https://residualstress.org/images/7/7a/IFF_Group2_1.2%25_Summary_r0v1.xlsx IFF_Group2_1.2%_Summary_r0v1.xlsx]
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| * [https://residualstress.org/images/c/c3/Submission_Summary_v2.xlsx Submission Summary v2.xlsx]
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| |'''Meetings'''
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| *ERSI_FCG Analysis Test_committee_IFF Overview.pptx
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| *ERSI_FCG Analysis Test_committee_IFF Overview_r0vf.pptx
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| *ERSI_FCG Analysis Test_committee_IFF_A10_work_01112023.pptx
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| *ERSI_FCG Analysis Test_committee_IFF_update_01102023.pptx
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| *ERSI_IFF_Working_Group_022323_r0v1.pptx
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| *ERSI_IFF_Working_Group_051123_r0v1.pptx
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| *ERSI_IFF_Working_Group_082522_r0v1.pptx
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| *ERSI_IFF_Working_Group_092122_r0v0.pptx
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| *ERSI_IFF_Working_Group_092222_r0vf.pptx
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| *ERSI_IFF_Working_Group_02232023_r0v0.pptx
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| *ERSI_IFF_Working_Group_07142022_r0v0.pptx
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| *ERSI_IFF_Working_Group_07142022_r0v1.pptx
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| *ERSI_IFF_Working_Group2_r0v0.pptx
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| *ERSI_IFF_Working_Group3_r0v0.pptx
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| |}
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