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Materials & Assembly

Aluminum Armor Plate Good Enough for Humvees

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Ann R. Thryft
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Re: Re : Alcoa's ArmX 5456-H151 armor plate
Ann R. Thryft   10/29/2013 1:47:48 PM
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Dave, thanks for that story. It's a good illustration of what can be done in lightweighting just by changing metals.

Dave Palmer
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Re: Re : Alcoa's ArmX 5456-H151 armor plate
Dave Palmer   10/24/2013 6:33:23 PM
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The article mentioned brake calipers.  Several years ago, I worked on a project with TARDEC to replace cast-iron brake calipers with high-strength aluminum brake calipers for a military vehicle (not this one).  Doing so reduced the vehicle weight by literally hundreds of pounds.

I'm not sure where that project went, since I left the company soon after.  My lab technician went on to get a master's degree out of the experience, while I'm still working (slowly!) on mine.

AnandY
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Re : Alcoa's ArmX 5456-H151 armor plate
AnandY   10/23/2013 6:38:19 AM
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The idea of using aluminum alloys to make arm or plates is, in my view, particularly important because of 2 reasons. First, we all know that aluminum weighs a lot less than speed. Thus the humvees will be lighter and easier to transport. The greater strength of this allow is also great for battlefront scenarios. But, on the downside, the reduced weight means that other reinforcements have to be added if it is to withstand blasts without flipping the humvee.

Ann R. Thryft
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Re: Aluminum Armor Plate
Ann R. Thryft   10/22/2013 4:54:12 PM
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Regarding both the 7085 alloy and possible armor construction, here's a 2002 press release describing the "new" alloy's use in blast-resistant (note that's *not* blast-proof) Fortress cargo containers for airlines:
http://www.alcoa.com/global/en/news/news_detail.asp?newsYear=2002&pageID=222034673
"The Fortress Container uses hardened aluminum alloys for both the frame and skin."
"The aluminum container structure is designed to resist pressure loads from an explosion, while an interior Kevlar lining provides protection from blast fragments. In designing the Fortress Container, Alcoa used its experience gained in developing aluminum armor for the Bradley Fighting Vehicle, the HMMWV (Humvee) and other military applications."
How much this tells us about the armor plates, vs the cargo container panels, is an open question, but it sounds like their construction is similar.
Here's some detailed info about the alloy. I couldn't extract the link, but if you Google this it should come up:
ALCOA_7085-T7452_Die_Forging_green_letter_Ed_3_August_2006.pdf

Ann R. Thryft
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Re: Aluminum Armor Plate
Ann R. Thryft   10/22/2013 4:36:29 PM
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Jim, I remember unobtainium. It's become the basis of several standing family jokes.



JimT@Future-Product-Innovations
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Re: Aluminum Armor Plate
JimT@Future-Product-Innovations   10/22/2013 3:57:10 PM
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Shields Up!  Photons incoming Of course, shields are produced using un-obtainium.

GTOlover
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Re: Aluminum Armor Plate
GTOlover   10/22/2013 2:04:54 PM
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Jim, why stop at transparent aluminum? Mr Scott could just give us the shield generator specifications!

How about vibranium or adamantium?

RICKZ28
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Re: Aluminum Armor Plate
RICKZ28   10/22/2013 12:51:47 PM
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The U.S. Navy also experienced problems with aluminum when the USS Stark (frigate ship) was struck by two Exocet missiles in the Persian Gulf in 1987...killing 37 sailors.  The aluminum melted in many places affected by fire, including aluminum stairs and ladders, hampering escape and damage control.  

All aluminum has a rather low melting point of around 1,200 degrees F (660 deg C), and the mechanical properties of aluminum are severely compromised by temperatures of only 400 degrees F (205 deg C).

Ann R. Thryft
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Re: Cost
Ann R. Thryft   10/22/2013 12:19:45 PM
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RICKZ28, thanks for that reminder about wheels. We covered aluminum and aluminum/plastic car wheels for the Ford Focus here http://www.designnews.com/author.asp?section_id=1392&doc_id=258467

JimT@Future-Product-Innovations
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Re: Aluminum Armor Plate
JimT@Future-Product-Innovations   10/22/2013 12:15:34 PM
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It's good that they've transitioned from Exotic Steel to Proprietary Aluminum. Now, the next logical step would be to switch to Transparent Aluminum! Montgomery (Scotty)Scott; Chief Engineer.

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