Minutes of the Spring 2005 Meeting
April
12-13, 2005
hosted by SAE World Congress, Detroit, Michigan
SAE Fatigue Design & Evaluation Committee
Meeting Minutes
April 12-13, 2005
SAE International Congress - Cobo Hall --- Room
W2-69
This FD&E meeting was held in parallel with
the SAE International Congress. Technical papers can be found in the “Research
and Applications” sessions under the Materials section.
Tuesday, April 12, 2005
8:00 a.m.
John Bonnen opened the session and talked about
the role of the FD&E committee to the audience.
Norman Dowling presented an oral
only historical review of notch strain for fatigue analysis. His presentation
can be found at http://www.esm.vt.edu/~ndowling
The following papers were presented during the
meeting and are listed here by author, paper number and title. Papers that are
available from SAE will not be repeated here.
Hong Lin presented paper # 2005-01-0795, Contact
Fatigue Tests and Contact Fatigue Life Analysis.
Franz Zieher presented paper # 2005-01-0796,
Thermal Mechanical Fatigue Simulation of Cast Iron Cylinder Heads.
J.S. Lee presented paper #2005-01-0797, The
Rolling Contact Fatigue Behavior of Nb and B Added Microalloyed Forging Steels.
Ayamitsu Amano presented paper #2005-01-0798,
Numerical Analysis of Optimum Peening Condition in Terms of Collision Energy on
Coil Spring by Shot Peening.
Marco Antonio Colosio presented paper
#2005-01-0799,Fatigue Life of Stabilizer Bars and Specimens for Two
Microstructural Conditions: Pearlitic and Martensitic.
C. M. Sonsino presented paper #2005-01-0800,
Stuctural Durability Proof of Automotive Aluminum Safety Components - Present
State of the Art.
Ken-Yuan Lin presented paper #2005-01-0801,
Durability Assessments of Motorcycle Handlebars.
Carlos Engler-Pinto, Jr. presented paper
#2005-01-0802, Statistical Approaches Applied to Fatigue Test Data Analysis.
Jiangtao Song presented paper #2005-01-0802,
Sensitivity Study of Staircase Fatigue Tests Using Monte Carlo Simulation
Wednesday, October 13, 2004
8:00 a.m.
Stoyan Stoychev
was given the SAE FD&E Henry O. Fuchs Student Award and gave an oral only
presentation on Internal Stress Intensity Factor - Calculation and Significance.
The following papers were presented during the
meeting and are listed here by author, paper number and title. Papers available
from SAE will not be repeated here.
Shinji Hashimura presented paper #2005-01-1320, A
Study of Loosening and Fatigue of Bolted Joints under Transverse Vibration.
Ralph Stephens presented paper #2005-01-1321,
Fatigue of High Strength Bolts Rolled Before or After Heat Treatment with Five
Different Preload Levels.
Nate Bradley presented
a progress report on his 3D
Elastic-Plastic Finite Element Bolt-Nut Models and Life Calculations.
Study includes 4 models,
coarse/fine thread rolled before and after heat treatment. Used 2D model to
refine geometry and meshing. Used temperature to simulate residual stresses.
Stress-strain response from test data.
Shows maximum stresses at
same locations in 2D and 3D models and are within 5%. He is currently
working on life predictions.
Jess Comer presented an oral only discussion on
Sources of Fatigue Failures of Threaded Fasteners
Ralph Shoberg presented an oral only discussion
on M-Alpha Method Applied to Tightening and Loosening of Fasteners.
11:20 a.m.
Planning session
Ralph Stephens asks what should we look at next?
Dan Lingenfelser - we should concentrate more on
analysis - why do we get the results we get?
Audience - would you get more input if fastener
manufacturers were present?
Audience - maybe involve more of the OEM’s who
are seeing these fastener issues.
Audience - we need more tests and less analysis.
Dan L. - we need knowledge to move forward. If
we understand notch behavior why can’t we predict finite life bolt behavior?
Jess Comer - we need to look at the entire joint
to gain real in-sight. Most “best-practices” information does not apply to
automotive situations.
Darrell Socie - we should either generate “new
knowledge” or distil what a few experts know into a form to be used by many.
Mary Wickham - we need to take a systems
approach in modeling/simulation of the bolted joint.
Peter Kurath - don’t be afraid to push the FEA
technology to it’s limits.
Audience - develop simple approach/methods to
verify a bolted joint integrity.
Ralph S. - we need to think over where to go
from here…. We need input!
1:30 p.m.
Peter Kurath presented paper #2005-01-1322,
Prediction of Welding Residual Stresses and Redistribution/Relaxation due to
Cyclic Loading.
Christian Gaier presented paper #2005-01-1323,
Fatigue Analysis of Welding Seams and Spot Joints in Automotive Structures.
Hans Nordberg presented paper #2005-01-1324,
Fatigue Properties of Stainless Steel Lap Joints.
3:20 p.m.
John Bonnen directed a discussion of the
Overview of weld challenges.
reviewed data from all 3 challenges
discussed exhaust tube hanger - challenge IIIa
discussed current challenge - design
must be testable (20 kip, 18 inch or less,
0.5 inch displacement or less)
fabrication (> 2 inch and 0.1 wall
thickness)
attachment must be large enough to weld
target life is 10^5 for un-welded and 10^4 for
welded
John B showed his critical specimen design
Helmut Dannbauer showed several versions of
analysis to produce a life on the order of 10^4 cycles. The most uniform damage
was shown with the tube upside down.
General discussion on critical specimen design.
More T-welds are being tested as both peened and
un-peened.
End of meeting
| 