Is TON simply modulus divided by a million? What exactly is modulus a measure of?

Thank you!

Harald

Check the rod building glossary here on this site for you answer.

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Harold,
I think that you mean tow rather than ton. When you see tow count on a graphite data sheet it is normally meant to be the number of graphite fibers per square inch. The higher the tow count the more fibers per square inch or the smaller each fiber is. Modulus is short for modulus of elasticity. It is the relationship between stress ( the applied force per square inch) and strain ( the amount of deformation that the force causes per square inch). You can think of modulus as stiffness. There is not necessarily a direct relationship between tow count and modulus of elasticity.

Actually Emory,
Our friends across the pond refer to the materials they use in the their blanks in a tonage rating. If I remember correctly the 30 Ton material refers to the equivalent of an IM6, 40 Ton a 50 MM and 50 Ton a HM material.

Todd

Harald,
I am going to have to defer to my expert friend Todd Vivien. I learn something new every day.
Sorry for the misunderstanding on my part. I also seem to make at least one stupid mistake every day as well.

Thanks Todd

Harald,

Simply put, the modulus is a measure of the stiffness of the material.

In the fishing rod industry the reference is usually with regard to the modulus of the linear fiber used in the construction, although the composite resin matrix plus fiber will have a modulus as well. The units will be expressed in Force/ area, so think of that as the pressure required to deflect the material a small amount (strain). The English units are psi/MSI, and the International units are usually Pa (Newton/ m2), or Ton/mm2. The ton is just a metric ton, which is 1000 kg force.


Todd has the numbers right; the 30 ton material is equal to a 42MSI fiber (IM).

mark

Thank you all!

Things are mutch clearer now!

regards, Harald