Hello group members. I am new to the application of PBC. I tried 2D PBC based on some youtube tutorials. However, I couldn't fully understand how to apply the PBC to a 3D model with bidirectional fibre to perform a compression test in Abaqus. I looked into an older post with similar questions, but it is difficult to follow. When I checked the research articles, the PBC equations varied. If anyone has solved a similar problem, please provide some instructions/information.