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

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.