AFGROW User Workshop 2018

Weber University Center Center for Continuing Education
775 S University Park Blvd
Clearfield, Utah 84015

An AFGROW Workshop will be held at the Weber State University Center in Clearfield, UT
on September 11-12, 2018.

The purpose of the Workshop is to provide a forum for AFGROW Users to exchange information and ideas, network with peers from industry, and gain access to the AFGROW developers.

The Continuing Education Center is close to the Hill AFB South Gate, and is very close to several other hotels in Clearfield. Continental breakfast and afternoon refreshments will be provided.

Group discussions will also provide direction for new capabilities and improvements, best practice methods and tips and tricks from the experts. AFGROW team will also provide information on the latest development efforts.

Who should attend: Engineers, researchers, technologists, and managers who are users of AFGROW and/or have an interest in Crack Growth Analysis tools.

The cost will be: $460.00/person until July 31, $495.00/person thereafter (continental breakfast and refreshments are provided).

The Workshop registration form is available to download.

Day 1, 11th September

Day 2, 12th September

8:00 - 8:30Welcome and Introductions (Continental Breakfast)
8:30 – 10:00Current AFGROW Release Overview
James Harter, Alex Litvinov (LexTech, Inc.)
10:00 – 10:30Group Discussion
10:30 – 10:45Break
10:45 – 11:15Investigating Crack Aspect Ratio Behavior and Multi-Direction Material Properties
Robert Pilarczyk (Hill Engineering, LLC)
11:15 – 11:45Analysis of Constant Amplitude Csk Hole Testing
Dallen Andrew (SwRI)
11:45 – 12:00Group Discussion
12:00 - 1:00 Lunch Break
1:00 – 1:30Prediction of fatigue crack growth at cold expanded fastener holes with ForceMate bushings
Yan Bombardier, Guillaume Renaud, Gang Li (National Research Council Canada)
1:30 – 2:00Group Discussion
2:00 – 2:15TBD
Jim Harter (Senior Consultant, LexTech, Inc.)
2:15 – 2:45Using Low Temperature Crack Growth Data in Crack Growth Analyses
Scott Fawaz (SAFE, Inc.)
2:45 – 3:15Validation of a Modified Single Edge Notch Tension Stress Intensity Factor Solution
Scott Fawaz (SAFE, Inc.)
3:15 – 4:15TBD
4:15 – 4:30Break
4:30 – 5:00TBD
8:00 - 8:30Continental Breakfast
8:30 – 9:30 Quantifying the Effect of Negative Stress Ratio Material Testing and Characterization on Fatigue Life Predictions
William Campbell (SwRI)
9:30 – 10:00 Crack growth rate testing in the surface (L-T), through-thickness (L-S), and diagonal (L-TS) directions
Luciano Smith, James Feiger (SwRI)
10:00 – 10:15Break
10:15 – 10:45TBD
10:45 – 11:15TBD
11:15 – 11:45TBD
11:45 – 12:00Group Discussion
12:00 – 1:00Lunch Break
1:00 – 1:30TBD
1:30 – 2:00TBD
2:00 – 2:45Current Development Overview
James Harter, Alex Litvinov (LexTech Inc.)
2:45 – 3:00Break
3:00 – 5:00BAMF Consortium Group Meeting
Robert Pilarczyk - Hill Engineering
3:00 – 3:30Current BAMF release overview
3:30 – 4:00BAMF utilization cases
4:00 – 4:30Current BAMF upgrades/feature implementation
4:30 – 5:00BAMF wish list and task priority
5:00Adjourn

If you would like to make a 20 or 40 minute presentation, please submit an abstract to . If you have a topic that requires more time, let us know and we will do our best to accommodate you.

Investigating Crack Aspect Ratio Behavior and Multi-Direction Material Properties
Robert Pilarczyk - Hill Engineering

Accurate characterization of crack aspect ratio (a/c) behavior for corner cracks at fastener holes has proven to be problematic with differing trends between observed test behavior and analytical predictions. Recent investigations as a result of the AFGROW Round Robin effort, utilizing an inverse analysis method to derive crack growth rate properties in the a- and c-directions, have proven to increase to correlation between test and analysis. Results derived for this same approach for the ERSI Round Robin baseline cases were compared to historical test data to understand the influence of multi-directional material properties of predicted versus test aspect ratio correlation. These comparisons as well as future considerations will be discussed.

Prediction of fatigue crack growth at cold expanded fastener holes with ForceMate bushings
Yan Bombardier, Guillamune Renaud, Gang Li - National Research Council Canada

Accurate characterization of crack aspect ratio (a/c) behavior for corner cracks at fastener holes has proven to be problematic with differing trends between observed test behavior and analytical predictions. Recent investigations as a result of the AFGROW Round Robin effort, utilizing an inverse analysis method to derive crack growth rate properties in the a- and c-directions, have proven to increase to correlation between test and analysis. Results derived for this same approach for the ERSI Round Robin baseline cases were compared to historical test data to understand the influence of multi-directional material properties of predicted versus test aspect ratio correlation. These comparisons as well as future considerations will be discussed.

Crack growth rate testing in the surface (L-T), through-thickness (L-S), and diagonal (L-TS) directions
Luciano Smith, James Feiger - SwRI

SwRI recently completed fatigue crack growth rate testing in the L-T and L-S directions for four aluminum alloys/product forms: 2024 plate and extrusion, 7075 plate, and 7175 forging. This testing was performed using a combination of standard ASTM E647 through-crack geometries [e.g., C(T) and M(T)] and part-through corner crack test axially loaded specimens. Testing was also performed in the diagonal direction between L-T and L-S, defined by ASTM E399 as L-TS, for the 2024 and 7075 materials. Presentation of the results includes a discussion of the impacts of implementing the tested rates in typical two-dimensional (a-tip and c-tip) part-through crack analysis and the potential impacts on multipoint analysis for which the analytical growth is often not orthogonal to the material directions.

Current BAMF release overview
Robert Pilarczyk - Hill Engineering

This will be a discussion of the current release of BAMF v5.0 (Feb 2, 2018)

  • Features (users’ manual, installation packages)
  • Reported bugs and issues
  • Current output format/post processing
  • Current BAMF default user options
  • Local system crack creation
BAMF utilization cases
Robert Pilarczyk - Hill Engineering

Accounting for Thermal Process Induced Residual Stress in Additive Manufacturing Based Laser Cladding Repair of High-strength AerMet®100 Steel-Kevin Walker Multi-Crack Multi-Point BAMF-An implementation case of a generic milled pocket crack

Current BAMF upgrades/feature implementation
Robert Pilarczyks - Hill Engineering

This will be a discussion of items slated for the next release of BAMF v5.1 (Jan 2019)

BAMF wish list and task priority
Robert Pilarczyk - Hill Engineering

This is an open discussion of items we would like to go after in the future. We would like to rack and stack this list based on desire/interest/feedback from the community. The community will be able to add to this list as well. These are items we would like to incorporate if funding becomes available.