REFLECTOR:STRUCTURAL ADHESIVE

Alexander Balic reflector@tvbf.org
Tue, 6 May 2003 17:44:19 -0500


The resin provides the shear strength of the laminate - it is like the
difference between trying to bend a board (strong resin) and a telephone
book (weak resin) the difference in the telephone book is that there is no
shear strength between the pages (fibers).  But you only need just enough
resin to make maximum contact with the fibers, any more, and the fibers will
tend to float apart, causing more of the (much) weaker resin to be in shear,
by cross section, as well as making the lay-up unnecessarily heavy. so the
argument is correct, but to be able to stress a given laminate is
proportional to the shear strength of the resin, but once the resin starts
to fail, the laminate is done (de-lamination) so perhaps a stronger resin
could provide the same stiffness with less fibers, but I would say that the
only way to significantly change the stiffness is to go to a lower modulus
of elasticity (low E)  fiber like graphite, that has less stretch than the
glass.

-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of lawrence epstein
Sent: Tuesday, May 06, 2003 6:42 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:STRUCTURAL ADHESIVE


Is this accurate?  I was under the impression that a very small percentage
of the ultimate (load bearing) strength is from the resin.  "strength" is
derived from the fibers .  the resin merely keeps the fibers lined up?

Larry Epstein
173 FGE

>I'm saying that for a laminate of the same strength or of the same
>stiffness you'd use fewer plies (and thus have less weight) with ProSet
>than with WEST.  (Note that they're both made by Gougeon)
>


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