Dear colleagues,

I am working with Python scripting on Periodic Boundary Conditions (PBC) for a GYROID unit cell in Abaqus. I used SHELL elements in Abaqus.

However, I have difficulty applying PBC on the corners of Gyroid because Gyroid only has 6 corners (C1, C2, C3, C5, C7, C8) and it does not have nodes (materials) on nodes C4 and C6 as shown in the figure, thus I cannot apply linear constraint equations to the node pairs related to C1 and C7.

For your information, I follow this paper to apply PBC for Gyroid: Omairey, Sadik L., Peter D. Dunning, and Srinivas Sriramula. "Development of an ABAQUS plugin tool for periodic RVE homogenisation." Engineering with Computers 35 (2019): 567-577.

If anyone knows this issue, could you please help me? I really appreciate this.

Thank you so much,

Best regards,