Some informations and tests to extract G value which depends on constitution and fiber orientation of material.

http://nptel.ac.in/courses/101104010/lecture12/12_4.htm

https://www.crcpress.com/Composite-Materials-Design-and-Applications-Third-Edition/Gay/9781466584877

Thanks Jean..!!

On my opinion, I mainly study wood, it is a typical anisotropic material, but when we caculate ,it is seen as orthotropic , 9 elastic modulus must be know, so determination is the most credable way to get them. However, generally, many get them through the composite material mechanics equations, the solution is different from the experiment .

I know it's a question from almost 2 years ago, but mayby it is helpful for somebody searching how to calculate the bulk modulus in orthotropic material.

I would recommand the paper of J. Summerscales.

Article Bulk modulus of carbon fibers

Thanks Johannes..!!

Hi Swapnil, did you get the answer to your question? I am looking for a way to compute Gij given Eij and vij. If you have an answer, please could you share (or point to it). Thanks.

Hello,

Experiments have found one known Formula which calculates the shear modulus from the matrix and fibers young modulus multiplied with with the volumes fractions : see my papers. Some assumptions are to be considered in the three dimensional case.

Dear Dr. Mohammed Lamine Moussaoui, I would be more than happy if you please refer to which of your papers that you have shared regarding a known formula to quantify the shear modulus. Layth

Dear Mr. Layth S. Al-Rukaibawi , The formula is cited in

Dynamic Detection of Reinforced Concrete Bridge Damage by Finite Element Model Updating , Journal of Mechanics Engineering and Automation, Volume 4, Number 1, pp. 40-45, 2014. The experimental known formula in composites is

(1/G)=(vm/Gm)+(vf/Gf) which gives G=(Gm*Gf)/(Gf*vm+Gm*vf)

where m is for the matrix, f is for the fibers, v for the volumes fractions and G for the shear modulus.