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Stitch
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Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 10:22 pm

http://seattletimes.nwsource.com/htm...space/2003849110_boeingtest23.html

Quote:
Boeing is set to perform a crash test today on its 787 Dreamliner — by dropping a section of the fuselage from the height of a second-story window.

Boeing has not done crash tests to get previous jets certified to fly. It's necessary this time because the 787 is the first airliner built largely out of carbon-fiber-reinforced plastic, which is more brittle and less shock-absorbent than metal.

(T)he test isn't designed to simulate a full-tilt fall to Earth. Rather, it replicates the vertical impact of an emergency landing in which the plane hits the ground harder than normal — often referred to as a crash landing.

Today's vertical drop will be Boeing's third and final crash test on the Dreamliner.

While none of these tests are "pass-fail", both previous tests matched the mathematical models Boeing used and were considered successful. Boeing officials expect this test to also match the models.
 
777236ER
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RE: Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 10:29 pm

Quoting Stitch (Thread starter):
While none of these tests are "pass-fail", both previous tests matched the mathematical models Boeing used and were considered successful. Boeing officials expect this test to also match the models.

Yes, you're right. These tests will be used to verify FEA-models.
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Stitch
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RE: Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 10:33 pm

Quoting 777236ER (Reply 1):
Yes, you're right. These tests will be used to verify FEA-models.

Yup.

And before somebody speaks up about using computer models instead of physical tests to certify the Dreamliner, FEM modeling has been used for a long time in many industries. And the A388's wing received certification when FEM showed that the additional strengthening Airbus would apply would make up the 3% needed to reach the 150% load before failure requirement.

Also, it is a given that the A350, as well as the 737RS and A320RS, will all be certified in a similar manner using extensive FEMing to the Dreamliner.
 
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zeke
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RE: Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 10:33 pm

Quoting Stitch (Thread starter):

Sorry, I also posted the article in the tech ops discussion we had about this recently....
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777236ER
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RE: Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 10:42 pm

Quoting Stitch (Reply 2):
And before somebody speaks up about using computer models instead of physical tests to certify the Dreamliner, FEM modeling has been used for a long time in many industries. And the A388's wing received certification when FEM showed that the additional strengthening Airbus would apply would make up the 3% needed to reach the 150% load before failure requirement.

Also, it is a given that the A350, as well as the 737RS and A320RS, will all be certified in a similar manner using extensive FEMing to the Dreamliner.

It's a much better way of doing things. If you have verified finite element models you can get much closer to the physicality of what's going on, instead of just increasing the thickness/diameter of a part until it stops failing.

Then again, I'm not a structures engineer, thank god.
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DAYflyer
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RE: Third And Final 787 "Crash Test" Planned For Today

Thu Aug 23, 2007 11:18 pm

Wow, droping airplanes from 20ft up. How cool is that?
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Stitch
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RE: Third And Final 787 "Crash Test" Planned For T

Thu Aug 23, 2007 11:32 pm

Quoting Zeke (Reply 3):
Sorry, I also posted the article in the tech ops discussion we had about this recently....

Ah. I was surprised nobody had posted about it before I opened my Seattle Times this morning.

For those interested, the thread can be found here - 787 Crashability (by Faro Aug 18 2007 in Tech Ops) and it has some good observations by a number of a.net members.

[Edited 2007-08-23 16:35:11]