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Engineering Materials

Aerospace-Grade Composites Will Repair Themselves

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Ann R. Thryft
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Re: Self healing process
Ann R. Thryft   5/27/2014 1:20:00 PM
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Mydesign, I totally agree.

Mydesign
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Re: Self healing process
Mydesign   5/23/2014 5:35:03 AM
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"a much wider operating temperature range is also needed in space, and also in military environments. OTOH, notice where the funding comes from: three different military-related sources, so you can bet they expect an ROI."

Ann, you are right. Wait and see is my answer for the second part.

Ann R. Thryft
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Re: Self healing process
Ann R. Thryft   5/22/2014 1:28:48 PM
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J. Lombard, thanks for your thoughtful and thorough comments. I had the same initial thought about repairing the matrix layers vs the fibers within them: this may work for delam issues but what about breaks in fibers? OTOH, as the authors say in their article's introduction, delam problems are among the most common, hardest to detect, and most difficult to repair, and these problems are at the top of the list for why composites haven't been adopted more widely for structural components. That's one of the main reasons why the researchers tackled these issues first.
Some of your other questions may be answered by the article itself. (Hint: a free copy is located on the website of one of the team's leaders: http://sottosgroup.beckman.illinois.edu)



Ann R. Thryft
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Re: Self healing process
Ann R. Thryft   5/21/2014 12:55:03 PM
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That's a good point, Mydesgn--a much wider operating temperature range is also needed in space, and also in military environments. OTOH, notice where the funding comes from: three different military-related sources, so you can bet they expect an ROI.

fdos
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Re: Self healing process
fdos   5/19/2014 6:16:23 AM
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@Elizabeth: Anyway taking short cust at this juncture is too risky. 

Elizabeth M
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Re: Self healing process
Elizabeth M   5/19/2014 5:59:50 AM
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Well that's good to know, Ann. This type of use is too critical to take any shortcuts!

Mydesign
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Re: Self healing process
Mydesign   5/19/2014 2:46:00 AM
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"Materials used in spacecraft, however, must withstand a lot more than those used in commercial planes, such as meteor strikes and radiation. This type of self-repair system might not do so well in spacecraft unless it was redesigned to accommodate those specific needs. Similar issues apply for use in military applications."

Ann, you are right and apart from that heat is also a major issue when the flight moves across different atmospheric level.

Ann R. Thryft
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Re: Self healing process
Ann R. Thryft   5/16/2014 12:16:47 PM
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Mydesign, there are definitely problems repairing fiber-reinforced composites in both aircraft and spacecraft -- because of the material's failure charactertistics and because of access issues -- and this material could be potentially used for both applications. Materials used in spacecraft, however, must withstand a lot more than those used in commercial planes, such as meteor strikes and radiation. This type of self-repair system might not do so well in spacecraft unless it was redesigned to accommodate those specific needs. Similar issues apply for use in military applications.



Ann R. Thryft
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Re: Self healing process
Ann R. Thryft   5/16/2014 11:37:15 AM
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fdos, this is a commercial aerospace-grade composite, meaning it's aimed at commercial aircraft, not military aircraft or any other military vehicles. Materials made to withstand missiles, bullets, etc. are made to a different set of standards.

Mydesign
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Re: Self healing process
Mydesign   5/16/2014 1:03:39 AM
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"New generation large aircraft are designed with all composite fuselage and wing structures, and the repair of these advanced composite materials requires an in-depth knowledge of composite structures, materials, and tooling. The primary advantages of composite materials are their high strength, relatively low weight, and corrosion"

Bmoray, you are right about composite material.

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