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UNCONFIRMED MINUTESSAE Fatigue Design and Evaluation CommitteeMaterials Properties DivisionLaConner, WashingtonMarch 27-28 1995Monday, March 27 - Divisional Progress MeetingThe meeting was called to order by Russ Chernenkoff. The minutes of the October 4-5 1994 meeting in Livonia, Michigan were approved as written. 1995 and 1996 SAE International Congress --A one day technical session titled "Fatigue Research and Applications" was held in Detroit, Michigan February 28, 1995. Eleven presentations on several fatigue related subjects were given. A full day session (12 presentations) is being organized by Russ Chernenkoff and John Bonnen for the 1996 Congress. Status of Work in Progress --Composite Task Group - Task group leader Mohamad El-Zein gave a status report on the testing and analysis of fatigue life predictions after impact of an S-RIM composite material. Active participants include Mohamad, Peter Kurath and Ali Fatemi. Mohamad showed how the damaged area of the composite specimen was measured using a C-scan image and Pixel coordinates. Mohamad also reported an excellent correlation between analytical predictions and actual test results. Peter Kurath reported on some additional data he collected using a transmission history and statistical analysis on fatigue after impact specimens. Contact Mohamad or Russ for the data associated with the above work. Powder Metal Task Group - Task group leader Steve Tipton was unable to attend this meeting. There was no progress report given in his absence. AerMet 100 - Ed Lu updated the work he has done with Phil Dindinger on evaluating the stress-strain behavior and crack initiation fatigue life of AerMet 100 steel. This material is a high Co and Ni alloy with high toughness, good corrosion resistance and a 280-300 Ksi UTS. Cyclic stress-strain data, strain-life data and a SWT analysis of the data was presented and is available from Ed Lu. Tuesday, March 28 - Divisional Planning MeetingComposite Task Group -Mohamad will report on progress of life prediction analysis and Peter Kurath will present results on variable amplitude loading at the fall meeting in Toronto. Kevin Lease volunteered to run tests on specimens with and without holes. Ralph Stephens suggested putting together a publication that documents all of the composite work (similar to AE-14???). Powder Metal Task Group - A planning meeting was not held due to Steve Tipton's absences. However, Steve sent a package to Ralph Stephens, Peter Kurath and Russ summarizing what have been accomplished to date. Steve also suggested several steps to proceed with this project. These include: additional mean stress tests to complete test matrix of BNA and BNB materials, variable amplitude testing (edited log skidder history), rotating bend tests to compare with axial data, notched specimens, and investigate several life prediction methods i.e. local stress-strain with conventional mean stress correction, local stress-strain with an empirical mean stress correction from constant amplitude data, Steve Downing's cast iron model and a fracture mechanics based model. Steve will update the Division on the progress of the PM project at the next meeting in Toronto. Anyone interested in participating in this project, please contact Steve or Russ. AerMet 100 - Ed Lu is looking for other members of the Division that are interested in continuing the work on this material. Peter Kurath suggested looking at mean stress effects and using the SWT correction. Ralph Stephens suggested comparing AerMet 100 data with SAE 1045 - Rc 55 data. Tom Cordes also suggested performing variable amplitude tests using the log skidder history. Tom will review the test data generated to date and determine if additional testing is worthwhile. New Business - Several committee members expressed an interest in modeling the fatigue behavior of structural adhesives. This subject will explored further at the fall meeting in Toronto. Respectfully submitted, Russ rchernen(at)ford.com fax 313 390-0514 |
