Rick Johnson
My opinion - for what it's worth - would be that the difference between
the two is considerable. While metal is a molecular structure linked in
many directions carbon fiber is orientated strands. Metal will indeed
propagate fractures from stress risers such as gouges and scratches.
Carbon fibers on the other hand being separate strands are very
unlikely to mimic this behavior unless a significant number of the
fibers are compromised. The resin itself does little more than
orientate and group the fibers into useful shapes and structures. The
fibers are responsible for the strength.
In either case the chances of cause a frame failure from the effect of
engraving is minuscule simply because the surface loads are not that
high in most areas one would reasonable consider such engraving.
My 2¢
Rick
Dan H wrote:
Jean,
Although unlikely, even a scratch can start a stress riser in the resin used
to stiffen carbon fiber.
I wouldn't chance it and I wouldn't buy a scratched carbon bike.----- Original Message -----
From: "Jean Wendling" <coaster65@charter.net>
To: "obra chat" <obra@list.obra.org>
Sent: Thursday, March 08, 2007 9:47 AM
Subject: [OBRA Chat] engraving
I use a Dermel engraver and just turn it to a lower setting so it
doesn't dig quite as deep when I do soft material like plastic or carbon
bikes.
I do mine underneath the bottom tube just in front of the bottom
bracket. Of course if you were to sell the bike be sure you inform the
buyer and note it on your bill of sales. I've sold 4 bikes over the
last few years and have had no problem with it. The down side is you are
permanently marking the bike, the up side is a fake sales slip won't
work because the signature on the sales slip and license ID won't
jive....thats
my procedure anyhow for what its worth....Jean_______________________________________________
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