Minutes of the Tracker
Technical Meeting
September 11, 2003
ACTION ITEMS:
1. Erik: send sidewall drawing revisions to BJ (done).
2. Robert, Tom: work out a better drawing release protocol.
3. BJ: make sidewall coupon drawings with all coupons laid out
on large panels.
4. Erik: send around strength requirements for sidewalls
(done).
5. Tom: send thermal coupons to Erik for testing.
6. BJ: send mid-tray assembly drawings for review.
7. Tom/BJ: send Sandro the latest bottom tray closeout
drawings. Also get them reviewed and
released for COI.
8. Erik: send corner bracket inner radius information to BJ.
Erik needs to review the sidewall drawings and get the changes
to BJ. They probably can be sent out
tomorrow or Monday for review.
Robert and Tom need to discuss the drawing release
protocol. At present it does not work
smoothly when comments and corrections come back from several reviewers.
Sidewall coupons: the plan is for BJ to make a drawing with the
complete arrangement of coupons. They
need to be clearly marked. For "B
allowables" we need eight coupons each.
Erik is still looking at strength requirements and will send
out his conclusions. Very roughly he
expects for unidirectional K13d coupons about 1500MPa, based on previous test
programs and somewhere around 300MPa minimum for the laminate.
Sandro said that Plyform will repeat the unidirection test next
week with a thinner laminate of only 10 layers and harder clamping on the
fiberglass doublers.
Tom noted that Plyform is asking COI to reach theoretical
values of strength (within 20%) in a unidirectional K13d coupon. He is afraid that COI cannot guarantee that
and may therefore reject the order.
Sandro said that the latest void content measurement at Plyform
was 1.2% on the unidirectional sample.
Tom will send the thermal coupons to Erik to be tested.
Bias wire bonds: to avoid loss of ladders from failed wire
bonds, Sandro proposed to double each connection and possibly introduce a
nodestructive test of 1 bond per pair.
Mid tray fabrication status: Sandro said that Plyform is just
starting to cut closeouts.
They need to write responses to the PRR RFA for core grounding.
For the carbon-carbon passivation issue, Plyform has ordered
the black paint; they must make some tests to decide between this and
resin. In any case, the resin worked
okay for EM trays, so we could stick with that.
Acceptance tests: they will work to define acceptance details
and NCR for panel fabrication.
BJ has redlines for midtray assembly drawings. BJ will send them out for review next week.
Sandro needs the latest drawings for top/bottom tray
closeouts. The assembly tool used last
time had several defects and was not complete, so they need to revise it. COI is getting ready to machine bottom tray
closeouts and needs the drawings also.
BJ needs information on corner bracket inside radii from Erik.