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Determine the Young's Modulus and Shear Modulus of Woven Roving

If the fiber weight per unit area of a woven roving(WR) is given as

24oz/sq yard fabric with a 5 X 4 weave style, is it a wise idea to calculate the Young's Modulus (Tensile Modulus) of the WR by assuming different volume fractions (Vf=0.3,0.4,0.5,0.6 etc)?

From what I understand,

Vf=W/(t*d) where, W=weight per unit area (known value) t=thickness (known value) d=fiber density (known value)

I saw this equation from a book. Is this equation make any sense to everybody? Besides that, I wonder if anybody know the way to calculate Young's Modulus, or Shear Modulus, of WR, Chopped Strand Mat, Continuous Filament Mat and Roving if testing is unapproachable at this point?

Your help is much appreciated.

Reply to
Laminator
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It depends upon what you are intending to do with the data.

So, to what use or methodology will you apply this data?

You do get a "volume fraction" by the use of the equation, but it may not be useful for the use you subsequently intend.

If you are dealing with a bare fabric, the Young's modulus will depend on not only the fiber modulus and the fiber content, but also the general geometric curvature of the woven fiber. Straight fibers act stiffer than the more crooked woven ones.

Have you ever worked with this stuff before, and learned about structures that aren't rigid monolithic metals or polymers?

It sounds like you just now approached the idea of working with fabrics.

Reply to
Jbuch

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