The auxetic honeycomb has a property of negative poisson's ratio, such as re-entrant honeycomb. However, when I compute the elastic constants of re-entrant honeycomb by 2D SG and 3D SG, it's shown that the result of poisson's ratio in the sc.k file is positive. How can I solve this problem.
Please provide more details about the model. When you create the model, make sure that you have period nodes if the material is period.
---- Emailed forum response from wenbinyu@purdue.edu
Thank you very much for your help. I changed the model to a periodic node according to your instructions (see the figure below for the specific model). Although I found that the Poisson's ratio of the 65 degree model calculated by 2D SG is negative, the 75 degree model is positive. I would be very happy if you could answer my question！
gao fei @ on — Edited @ on
Hello
The auxetic honeycomb has a property of negative poisson's ratio, such as re-entrant honeycomb. However, when I compute the elastic constants of re-entrant honeycomb by 2D SG and 3D SG, it's shown that the result of poisson's ratio in the sc.k file is positive. How can I solve this problem.
Wenbin Yu @ on — Edited @ on
gao fei @ on
Dear Prof. Yu
Thank you very much for your help. I changed the model to a periodic node according to your instructions (see the figure below for the specific model). Although I found that the Poisson's ratio of the 65 degree model calculated by 2D SG is negative, the 75 degree model is positive. I would be very happy if you could answer my question！