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LBL Status

LBL Status. August 5, 2008. Shear Stress Studies. Issues are stress in foam and adhesives. Crack/fail(thermal impact)? Bill Miller working on FEA for different assumptions. I’m trying to understand.

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LBL Status

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  1. LBL Status August 5, 2008

  2. Shear Stress Studies • Issues are stress in foam and adhesives. Crack/fail(thermal impact)? • Bill Miller working on FEA for different assumptions. I’m trying to understand. • Max. stress at ends, same for short(2x4cm) and full length(2x60cm) confirmed by FEA => test on short items

  3. Shear Stress Samples • Made 5mmx5mmx6cm foam/Al tube samples to thermal cycle and look for foam cracks visually at the moment. This is for both POCO and a candidate pixel foam. Curing. Results next week.

  4. Prototype Materials • Honeycomb ordered • About 400 cu. Inches of M46J/EX1515 at 3.5 lbs/cu ft nominal(Ultracor UCF-119-3/16-3.5). +/-45 deg, said to be from 30 g/sq m unitape • Slab ½ to +/-0.002”(best they can do) to 5mm nominal thickness. We will go there and check first parts for thickness. Reserve remainder(extra setup charge for later cutting) • They say 3mm is minimum slab thickness they can do, am a bit nervous about uniformity at 3mm • Delivery is 8 weeks ARO ie. end September(for slabs) • Facings • Autoclave maintenance has delayed start on panels for petals • But expect to begin this week. One panel first(and some for other projects) to see how it looks. Will be 0/90/0, 0 in the radial direction for petals. • Koppers foam • Noted concern about large pore size and variable pore size. • Doing cutting/machining tests to compare experience with POCO(for which the experience is good) • Need to validate Koppers foam as candidate. Is there thermal experience at BNL to show that Koppers = POCO? Can’t trust vendor…..

  5. Prototype Content • Need to define each component of prototypes – see example table below(also on agenda page). • Urgent to converge, weeks to months lead time for tubes(?), adhesives. • What facings for stave prototypes at BNL? Fiber? How many g/ sq m? • Status of long tube order? Need OD to machine foam. • How to converge and fill in all of this table(or equivalent)?

  6. Tiny “Prototypes” • For consideration….stress, POCO/Koppers comparison, adhesive studies… • We could make tiny “prototypes”(2.5x6cm) as we have for pixels to directly compare thermal performance of POCO/Koppers and simultaneously look at thermal performance before and after thermal cycle(to see effect of stress) • Could also use these as adhesive test vehicles, in communication with AiT about best adhesives to use and their properties.

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