Re: Great Re: Negative Thermal Coefficient Composite
leifer@sunrise.stanford.edu (Larry Leifer)
Date: Thu, 17 Mar 94 11:24:48 PST
Message-id: <9403171924.AB11316@sunrise.Stanford.EDU>
To: sticklen@cps.msu.edu (Jon Sticklen, ISL @ MSU)
From: leifer@sunrise.stanford.edu (Larry Leifer)
Subject: Re: Great Re: Negative Thermal Coefficient Composite
Cc: sticklen@pleiades.msu.edu, mcdowelj@pleiades.msu.edu,
Joe Vagner <joew@legolas.stanford.edu>, fertig@rpal.rockwell.com,
martin@rpal.rockwell.com, "Glenn A. Kramer" <gak@eit.COM>,
petrie@sunrise.Stanford.EDU, toye@sunrise.Stanford.EDU,
leifer@sunrise.Stanford.EDU, cutkosky@sunrise.Stanford.EDU,
gruber@ksl.stanford.edu, fikes@ksl.stanford.edu, weber@eit.com,
mcguire@eit.com, marty@eit.com,
Gene Bouchard <bouchard@aic.lockheed.com>,
"Greg Twiss" <greg_twiss@qm.is.lmsc.lockheed.com>
At 11:20 AM 3.17.94 -0500, Jon Sticklen, ISL @ MSU wrote:
>Larry,
> I was going through old mail and happened on the mail below. Recently,
>Jim McDowell and I had a conversation with composites design engineer at GE
>Aircraft Engines who shed more light on your question.
> The answer I forwarded to you before was based on intrinsic material
>properties. Another answer for materials with negative thermal expansion
>coefficient is around fabric layups that are designed such that materials
>will expand in one direction while they contract in another. So in at least
>one dimension they would have a negative thermal coefficient. This angle
>would involve designing a fabric layup to do what you want. We do not have
>specific expertise in the center to advise you on this at the detail level,
>but if you want to pursue it, we could try to make linkages between you and
>the people with the expertise.
timely,
helpful,
thanks
>
> How is the MADE project going? There was a flurry of activity for a short
>time, but we have not heard anything lately. I am a little uneasy about
>that because it "feels like" we should be doing something.
you are about to get the next Wave,
it's all going up on WWW now and will be public
later this week, there IS a LOT to be done,
and having you guys fab something to spec is an early
warm-up exercise.
larry
>
> I am going to be out of the country for a couple of weeks from Monday, so
>if MADE things come up that require our input, please direct correspondance
>to Jim.
>
> Regards,
>
> ---jon---
>
>
>
>
>
>
>
>
>>Jon,
>>
>>thanks very much,
>>i'll forward to the design team,
>>may even use it on the IRFPA challenge we took in DC,
>>
>>Larry
>>
>>At 2:53 PM 2.14.94 -0500, Jon Sticklen, ISL @ MSU wrote:
>>>Larry,
>>> Sorry we missed you at the end of the session last Thursday. You were
>>>deep in a conversation, and Jim and I had to get to downtown.
>>>
>>> I asked Larry Drzal, Director of our Composite Materials and Structures
>>>Center, the question you asked me about negative expansion composites.
>>>Following is what he suggested ...
>>>
>>> Jon---the high modulus carbon fibers have a zero to slightly
>>>negative
>>> CTE. In fact that is why they are used as antenna components for
>>> satellites. The Stanford prof might have a student look up the book
>>> CARBON FIBERS, by J.P.Donnet, 2nd edition to find out more about
>>>them.
>>>
>>> Larry
>>>
>>>
>>> If you have more on this subject, either send mail to me or Jim
>>> McDowell and we will run down composites-related facts for you.
>>>
>>> ---jon---
>>>
>>>
>>>
>>>
>>>------------------------------------------------------------------
>>>Jon Sticklen, Director tele: +517-353-3711
>>>Intelligent Systems Lab - Eng College FAX: +517-336-1061
>>>A714 Wells Hall office in A392 Eng Bldg
>>>Michigan State University
>>>East Lansing, MI 48824-1027 home telephone: +517-337-5690
>
>
>
>------------------------------------------------------------------
>Jon Sticklen, Director tele: +517-353-3711
>Intelligent Systems Lab - Eng College FAX: +517-336-1061
>A714 Wells Hall office in A392 Eng Bldg
>Michigan State University
>East Lansing, MI 48824-1027 home telephone: +517-337-5690