Re: Sticking brass to mild steel

On Wed, 30 Jul 2008 01:37:25 +0100, Cliff Ray
<cliffrayS@xxxxxxxxxxxxxxxxxxxx> wrote:

BTW, the newest Boeing plane has a composite
skin. Composites abound in the new plane. Usually a new plane design
is tested to failure in several areas. The wings are pulled up until
they catastrophically fail. From my friends who work at Boeing the
word is that the new composite wings have far exceeded the calculated
maximum stress where failure should occur. So far the wings have not
been destroyed because the flexing has so far exceeded the design and
calculated failure point. Word is that some folks think it's not
needed but I bet that they will ultimately be stressed to the breaking
point if only to see where they really fail and for bragging rights.
ERS

Is that not very worrying? If they are so far out on the calculated
failure point, are they not just as likely to have made mistakes the
other way in parts of the design? At the very least the wings must be
more expensive and heavier than they need to be.
Actually, I was wondering the same thing. Is it really that overbuilt?
This plane was designed completely on computers, no wind tunnel stuff
and the like first. The first plane of this magnitude to be done this
way. I'll bet that by the time my friends told me about it the facts
had been filtered through so many people that the truth is somewhere
unknown. I do know that the wings were flexed was past what aluminum
wings can take and they did not fail. And that they did exceed design
strength. At the same time they are apparently stiffer than aluminum
wings.
ERS
.

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