Dear Serge,

Please refer following my article.

https://www.researchgate.net/publication/308940405_Stress_redistribution_as_an_effect_of_non-uniform_in-plane_laminate_stresses_in_laminate_composite_plates

In the appendix, there is the concrete values.

These values are picked up from following reference article. Hence they should be relevant.

https://www.researchgate.net/publication/223796721_Interlaminar_stresses_in_composite_laminates_with_a_circular_hole

Best regards,

Dear Serge

Refer to "HexPly 8552 MATERIAL PROPERTIES DATABASE for use with COMPRO CCA and Raven "

http://www.niar.wichita.edu/coe/ncamp_documents/Hexcel%208552/Hexcel8552MaterialCharacterizationBinderV0-9.pdf

Negative through-the-thickness Poisson’s ratios are investigated macroscopically and microscopically in the elastic–viscoplastic behavior of angle-ply carbon fiber-reinforced plastic (CFRP) laminates. For this purpose, an analysis method is proposed based on a homogenization theory for nonlinear time-dependent composites with point-symmetric internal structures. This method is able to efficiently analyze both the macroscopic and microscopic elastic–viscoplastic properties of angle-ply CFRP laminates fully modeled with microstructures consisting of fibers and a matrix. Using the proposed method, the elastic–viscoplastic analysis of angle-ply carbon fiber/epoxy laminates with various laminate configurations is performed to investigate their Poisson’s ratios in the viscoplastic region. It is revealed that, for a range of laminate configurations, the through-the-thickness Poisson’s ratios exhibit negative values which become increasingly negative as the viscoplastic deformation progresses in the laminates. The effect of strain rate on this increasing negativity is also demonstrated, and microscopic mechanisms are investigated to explain this trend. It is further shown that the increasing negativity significantly affects microscopic interlaminar stress distributions.

dear sir

this may be help you

best reqards

Dear Nabel kadum abd-ali,

thank you for your answer. Your information about negative Poisson ratio of directionally-oriented laminates is a of great value for me (see, please a number papers on Research Gate). But in my question I am interested in table value of Poisson ratio for one commercially manufactured unidirectional carbon plastic,

namely, HexPly8552/33%/134/IM7(12К) 0 and will be appreciated for this data.

Thank you and all colleagues again!

Dear Serge,

If you have the individual Poisson's ratios for HexPly8552 (which I suppose is the matrix material here) and IM7 (12K)(which I suppose is the fiber reinforcement here) then you can calculate the properties(all of Poisson's ratios) of the lamina constructed with these fiber and matrix materials using following article.

https://ntrs.nasa.gov/search.jsp?R=19830011546

I hope this helps.

Best Regards

Dear Akash Sharma, thank you !