Saturday, 19 April 2014
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Researchers test bomb-proof luggage hold for aircraft

A flexible, bomb-proof luggage hold for aircraft is being tested by a team of international researchers.

It could replace the heavier, more expensive hardened luggage containers that are currently used as a precaution against the threat of in-flight explosions.

The Fly-Bag has multiple layers of novel fabrics, composites and coatings, and is designed to be filled with passenger luggage and then placed in the hold of an aircraft.

Fundamental to the design of the bag is the internal elastomeric coating and impregnation of fabric with shear thickening fluids (STFs), as project collaborator Dr Jim Warren of Sheffield University’s Department of Civil and Structural Engineering explained to The Engineer.

‘If you imagine the yarns of the fabric sliding across each other and changing orientations as you stretch it in both directions at once. What happens is the fluid that’s sprayed into each fibre of the yarn starts to stiffen up and resist that mechanical strain.’

STFs work by increasing their viscosity in response to impact. Under normal circumstances, the particles in STFs repel each other slightly.

However, following sudden impact, the extra energy in the system proves stronger than the repulsive forces, causing the particles to clump together in structures called hydroclusters, which bump into each other, consequently thickening the fluid.

‘The real damage is caused by impulse rather than the energy and that’s a very important concept,’ Warren said.

‘What we’re actually interested in is taking that impulse and, rather than have it all applied to a structure over a very tiny time period, we want to take the same amount of momentum and stretch it out over as long a time period as we can so that the peak stress falls.’

The group has built a full-scale prototype that Warren says has been tested with an explosive device of a similar potential as the bomb that brought down Pan Am Flight 103 over Lockerbie in Scotland in 1988.

‘The bag is showing no sign of failing yet, so we have to just keep putting bombs in bags and blowing them up until something fails, and then we can say this design is good up to this sort of level — which we’d only be able to discuss with secured parties,’ Warren said.

Fly-Bag

The Fly-Bag, co-developed by Sheffield University, contains fibres that stiffen to resist the force of a bomb when it explodes

Readers' comments (6)

  • This looks very good on the face of things, but will it rely on the use of correctly closed zips/latches to ensure integrity? If so that is the achilles heel in the concept. Baggage handling personnel at any airport are more than capable of rendering any such type of fastening useless in moments.

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  • The anonymous comment, that baggage handlers can easily render the Fly Bags impotent by interfering the closures, points up how vulnerable all simple "good schemes" are. We've just had a proposal to require photo ID for all flyers. Why bother? It will inconvenience the 99.9% of honest passengers, and the 0.1% of mad bombers are already able to make good-enough Driver Licences etc on the kitchen table with a printer and a laminator. It's nothing more than feel-good sleight of hand.

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  • This looks interesting. A simple example that people can try at home is to mix corn starch in a bowl until almost saturation. Slowly run your fingers through the mixture, then move your fingers quickly through the mix. Feel the difference.

    I think this is a great idea and I have read that this type of material has been tested for better bullet proof vests that are both quite flexible and strong.

    I agree that the people doing the tests need to test if the bag isn't closed properly and possible failures.

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  • Great idea. As for the baggage handlers not closing the bag properly? The opening needs to be electronically interlocked, if not secured. Flag alarms could be needed, rather like seat belts in modern cars, with the associated alarm notification.

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  • Great work! Researchers should couple it with a baggage hold that detaches from an aircraft after an explosion.

    Incidents of human errors & intervention will always be there but that shouldn't stop researchers from working on new ideas.

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  • Interestingly enough I worked on a the same idea over 10 years ago, which was initially to prevent bulk tanker leaks but was then increased to cover fuel tanks (road) and other items, unfortunately while I had interest from suppliers and others to work on it (R & D), Greenpeace said "great idea but we can't support it as its a commercial product" and Business Link couldn't grasp it, it fell by the wayside.

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