Analysis & Test

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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.

Interference Fit Fastener Round Robin (2022, in-work)
Objective: The primary objective 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:

1.      The onset of plastic deformation and the bounds of elastic vs. plastic regimes

2.      The relationship between far field loading and local strain cycles

3.      The stress state dependency as a function of key factors (e.g. interference level, modeling assumptions, remote loading)

Inputs
Submissions
Meetings


Cx Variability Round Robin (2022, completed)
Objective: Recent discussion within the ERSI Analysis Methods & Testing Committee have identified a need to perform a round-robin exercise focusing on how uncertainty in fatigue response due to the random variability in residual stresses at Cold Expanded (CX) fastener holes can be captured in damage tolerance analysis (DTA). This round-robin seeks to address the following:

·        Identify the sensitivity of DTA capabilities to variability in a CX fastener hole treated within specification

·        Identify the impact of using computational, empirical, or combined residual stress results in DTA

·        Anonymously compile ERSI community results for the above listed objectives for group comparison-to-test

·        Derive best-practices guidance from comparisons and in-depth-technical review by the ERSI community


Stress Intensity Factor Round Robin (2021, completed)
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.


Cx Round Robin (2017, completed)
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
Misc Other
Publications
Results


AFGROW Workshop Round Robin (2017, completed)
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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