here it
goes.
1. Validate that the "real
world" friction shims work as advertised.
2. Determine change in
preload of the entire assembly when cooled to 80K and
cycled.
3. Validate FEA models for
individual bolt connections.
4. Determine cyclic effects
on the overall joint.
5. Establish if the "strain
gage in bolt" will work to monitor preload during
operation.
6. Pull to failure of
friction shim at which point bolt will load up and take shear. (when does this
happen)
7. From a practical
standpoint, the info should allow us to come up with a re-tightening
schedule.
All the
best
Kevin
Kevin D.
Freudenberg
Mechanical Design and
Analysis
US ITER
Team
(865)
574-1310
From: Wayne T.
Reiersen [mailto:reiersen@pppl.gov]
Sent: Monday, July 02, 2007 3:18
PM
To: Freudenberg, Kevin
D.
Cc: Nelson, Brad E.; Cole,
Michael; Williamson, David E.
Subject: Shear test
objectives
Kevin,
It was useful for the
tension tests to write down the test objectives (see below). Would you
please take a shot at doing the same for the bolt shear tests? First on my
list would be to confirm the FEA modeling of the bolted joint. I remember
from the “pin cushion” test that our estimate of the stiffness was quite high
compared to the ideal model.
Regards,
From: Wayne T.
Reiersen
Sent: Tuesday, May
29, 2007 9:18 AM
To: Geoffrey
J. Gettelfinger
Cc: Lawrence E.
Dudek; Bradley E. Nelson; xdw@ornl.gov; Phil Heitzenroeder;
mjc@ornl.gov
Subject: Tension
test objectives
Geoff,
To answer your question in writing,
the objectives of the tension tests are as follows:
1. Determine
deflection of joint under axial preload
2. Confirm
Supernut torque-load curve and accuracy of UT
tester
3. Determine
change in preload when cooled to 80K
4. Determine
change in preload due to thermal cycling
5. Determine
change in preload due to relaxation at RT
6. If there is
noticeable relaxation at RT, re-tighten the assembly and determine if there is
any subsequent change.
Others, please add or subtract as
appropriate.
Thanks,