On Monday, February 24, 2020 at 1:10:02 PM UTC-5, googlemyass wrote:
On 2/23/2020 1:37 PM, Richard Smith wrote:
Bob La Londe writes:

On 2/23/2020 7:45 AM, Christopher Tidy wrote:
Hi folks,

A quick question for the guys in aerospace and materials science. A long time ago, I remember hearing about an aircraft alloy (I think it was aluminium based) which followed a hardness curve over about 40 years during normal use (i.e., at normal aircraft operating temperatures). This meant that it was strongest after about 20 years, and then became weaker with age. Can anyone tell me the name of this alloy?

Thanks!

Chris


Airplanes can experience fatigue overtime, but its from vibration and
flex. You really shouldn't barrel roll a jumbo jet. LOL.

The Duralumins (Al-Cu alloys) have low very predictable fatigue crack
growth rates - reason they are still used for the bidirectionally
stressed underwing panels of aircraft wings (?).


There's transparent aluminum. The alloy is strong enough to be used for
water tanks for whales but extremely light weight. I'm not sure of the
long term fatigue rate. It's pretty hard to get as each time I've tried
it's on back order with no delivery date. It's probably because the
alloy contains a fair amount of Unobtainium.

Steve


It is only available to Starfleet Rear Admiral, or higher.