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  #21 (permalink)  
Old 10-07-2013, 07:25 PM
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Default Re: Retro outfit

Just brushed up on my terms, it's been a long time since I learned this stuff.


Wiki says - modulus of elasticity is an intensive property of the material. The stiffness of a structure is of principal importance in many engineering applications, so the modulus of elasticity is often one of the primary properties considered when selecting a material. A high modulus of elasticity is sought when deflection is undesirable, while a low modulus of elasticity is required when flexibility is needed.
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Old 10-07-2013, 07:49 PM
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Default Re: Retro outfit

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Originally Posted by pszy22 View Post
It's not so much that they are thinner and that there are more fibers used, rather the inherent nature of the material is actually stiffer than e=glass.

But I think you are right in that S-glass is typically extruded in a smaller diameter than E-glass typically is.
No it's not stiffer. Glass is glass and the fibers are all the same
The s-glass is "stiffer" only because there is more fibers in a given area.

But the fact is that hardly matters. Modulus is just a way to describe stress.
What matters more is the taper and how a rod casts.
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Old 10-07-2013, 08:14 PM
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Default Re: Retro outfit

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Originally Posted by Rip Tide View Post
No it's not stiffer. Glass is glass and the fibers are all the same
The s-glass is "stiffer" only because there is more fibers in a given area.

But the fact is that hardly matters. Modulus is just a way to describe stress.
What matters more is the taper and how a rod casts.
Glass isn't glass, there are different formulations used. Fiberglass is made primarily of silica (silicon dioxide, SiO2) but contains some percentage of other oxides that modify its properties for a particular application. Common fiberglass modifiers are calcium oxide (CaO), magnesium oxide (MgO), aluminum oxide (Al2O3) and boric oxide (B2O3).

Modulus does not just describe stress, it's the slope of a stress/strain curve -

An elastic modulus, or modulus of elasticity, is the mathematical description of an object or substance's tendency to be deformed elastically (i.e., non-permanently) when a force is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region:[1] As such, a stiffer material will have a higher elastic modulus.

While modulus isn't the same as stiffness, it does play a significant role. A one inch diameter member made with a material that has a higher modulus will be stiffer than a one inch diameter member made with a lower modulus material.
And of course, a half inch member will be less stiff than a one inch member.
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Old 10-07-2013, 08:41 PM
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Default Re: Retro outfit

Thanks for setting us all straight
It's obvious to me that all your vast knowledge equates to a high understanding of how this all applies to the use of glass fly rods

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Old 10-08-2013, 04:40 AM
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Default Re: Retro outfit

Well at least we've reach consensus that this was a fairly useless tangent.
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Old 10-08-2013, 08:28 AM
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Default Re: Retro outfit

I've been informed about E & S and where it was applied, thanks. This is relevant as these efforts to improve the material performance of glass rods is what led rod makers, beginning with Fenwick I believe, to experiment with yet higher modulus carbon fiber leading up to the ever improving rods of today.
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