Chuck, someone knows a lot about the subject, and I wish I did. I've already spent quite a lot of time surfing and snooping around on the Web, but it's quite difficult to find out anything aside from what's in that GAO report, and Boeing is less than forthcoming. I assume this is for security and/or market competition reasons. I'm checking the MRO schools' websites for course descriptions, e.g., but not much luck so far. The thing to remember, in general, is that repair techniques have existed as long as composites in aircraft have existed, but for some time it was all military. Then they entered the commercial aircraft sector, but not, I repeat not, in primary structures. Their use in primary structures has changed everything.
Alex, thanks for thinking industry-wide again. I agree, the technology is certainly in the early stages and it makes me wonder how many other coatings manufacturers or composite airstructure makers are conducting similar research under the radar, possibly even in partnership with each other. It might make more sense from an industry standpoint to develop and commercialize something that can be applied by all airstructure manufacturers and regulated by the FAA. But that also assumes that it can be applied in an aftermarket scenario and still work properly. I get the impression that GKN's coating needs to be "baked" in, either literally or figuratively, in order to do its job. But that could also be because they are not a coatings manufacturer.
TJ, that's funny, using whiteout to detect cracks and delams. I bet it worked great. But I doubt if that would work on CFR composites or even glass-reinforced composites. Damage on these, especially CFR, is invisible to the naked eye and techniques for detecting it different from those used for detecting same in traditional materials. You are right, I carefully did not reveal the wavelength since I honored the company's request in order to get this much published.
You say damage-detecting coatings have been around for awhile, but not using non-visible wavelengths. Do you mean that damage-detecting coatings *for these composites* have been around for awhile? Please inform us if you know!
Thanks for the info, Ann. So that means that the ability to utilize this detection technique will be proprietary, but I guess it also indicates that the state of the technology is at the point where other composite makers should be able to do this too, at least eventually. (That's unless there's only a very narrow class of coatings which are amenable to the detection process, and they're patented or trade secret.) Anyway, I guess the upshot is that this is not going to be anywhere near as industry-widee as I assume. At the same time, it opens up the idea that, with technology advancing, maybe the FAA can move towards some specificity in its composites directives.
I've seen simple things like White-Out used during materials testing to detect cracks and delaminations.
The damage-detecting coatings themselves I believe have been around for a while. The trick to which this article alludes is the non-visible wavelengths that would be used. THAT is a good idea. Damage-detecting coatings that the flying public can see are not confidence building.
The article carefully did not state which spectrums would be used, whether infrared or ultraviolet. I might consider watching the wing with my IR scanner in the future....
Alex brings up two important points. First, since this proposed coating or class of coatings will be available only as an inherent part of a composite airframe structure sold by one company, it won't be available for other composite airframe structures sold by other manufacturers. I've already heard of one other project targeting a similar purpose but using an entirely different chemical and behavioral model. That means competition among different types that work in different ways. So actually there may not be much in the way of industry-wide techniques.
Second, it does provide a great opportunity to gather MBTF data. Even if it's coming from airstructures using entirely different coating types, the data should be comparable about how composites break.
This is indeed a significant development because it holds the promise that there will be a cost-effective, easily implementable, repeatable, industry wide technique for inspect composites. This is going to be critical important not only to prevent in-flight failures, but also to gather life (MTBF) data on how different composite structures actually perform on commercial aircraft, particularly on primary structures like wings. (A primary structure in aerospace terms refers to a part where, if it fails, the plane will no longer be flyable. So for example you can survive a rip in the fuselage, but not the loss of a wing.)
I don't think the technology has been around for awhile, at least not for composites. The idea may have been. But there's a big difference between realizing one can use coatings to assist in detecting damage--the no-brainer aspect--on one hand, and on the other figuring out exactly what coatings, how they should work, how to apply them without causing other problems, etc. Since GKN is a supplier of composite airstructures and since their scientist describes redesigning a coating at the microsphere level, I would suspect that what's taken some time is the process of figuring out details of how to make and implement such a coating. Even at this point before the 18 months + another 18-24 months before commercialization, they gave a quite coherent description of the basic idea. Yet it will likely take 3+ years before a flight test is likely. So the R&D involved is not trivial.
UK-based Plastic Logic and French company ISORG have created what the pair tout as a first in flexible printed electronics: a large area, conformable, organic image sensor printed on plastic.
For 3D printing to make the jump from rapid prototyping to manufacturing, engineers will need to find easier ways to move products from their CAD screens to their printers.
Gigabit and PoE are two networking technologies moving ahead in tandem as industrial users power remote Ethernet devices such as IP security cameras at 1,000 Mbps over existing CAT5 cable.
From Dell / Intel® New Paradigms in Design Work Scott Hamilton, vertical market strategist for Dell Precision workstations, 5/2/2013 5
Early in my career, I worked as a draftsman and remember the days of drawing on vellum with numbered pencils and Mylar with plastic lead. This was a fun experience in the sense that I ...
I've been using workstations for more than 10 years and love finding ways to get more performance from my system. With demanding professional applications that require more power each ...
A lasting memory from my first job as an engineer in an auto assembly plant is standing on hard concrete at six in the morning, vending-machine coffee clutched in hand, listening to ...
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.
To save this item to your list of favorite Design News content so you can find it later in your Profile page, click the "Save It" button next to the item.
If you found this interesting or useful, please use the links to the services below to share it with other readers. You will need a free account with each service to share an item via that service.
Tweet This
1 
