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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