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Re: [TowerTalk] Solid Al vs Solid fiberglass ?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Solid Al vs Solid fiberglass ?
From: jimlux <jimlux@earthlink.net>
Date: Sun, 22 Jan 2017 18:18:53 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 1/22/17 3:06 PM, Jim Thomson wrote:
Which is stronger,  1 inch  6061-T6  solid rod...... or  1 inch solid 
fiberglass rod ?
I know what the tensile + yield  strength is on 6061-T6...... but the typ solid 
fiberglass rod  gets a bit tricky.
Extrapolating from metric to queens english, it appears that solid fiberglass 
rod  has a typ tensile strength
of  100 ksi, and a yield strength of 88 ksi.     I find this real hard to 
believe,  but I have zero knowledge of the
typ solid fiberglass rods sold  for insulators for yagis and ants.


I usually assume that structural fiberglass is about the same strength as aluminum. It's more flexible, though. And it is weaker for certain types of loads - if you have pultruded structural shapes (fibers all run the long way), then the shear strength crossways is less than lengthways.

This is what I use
http://www.strongwell.com/products/structural-shapes-and-plate/

strength is tensile  30ksi lengthwise, 7ksi crossways,
            compressive 30ksi  lengthwise, 15ksi crossways

modulus is 2.7M psi



6061-T6  is typ listed as 48 ksi for tensile , and  39-40 ksi for yield.


and the modulus is about 10M psi, so it's about 3 times stiffer than aluminum

I have an application where  I have to either short out the oem 1 inch solid 
fiberglass rod, or  replace it with solid 1 inch 6061-T6 rod,
and this is way out on each ele half, like 200 inchs  out from the 
center...with another 204 inchs of tapered al tubing beyond each insulator.
If the fiberglass is stronger, I might just short it out with an Al strap.

If I knew the aprx yield strength of the solid fiberglass, then I could plug 
the numbers into  the  dx eng mech software.

Jim   VE7RF
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