Abaqus: Abaqus: Antisymmetric stresses in fiber reinforced open hole plate?

[Georg Kant]

Hello, i am kind of new to abaqus and i am trying to simulate an open hole plate reifnorced with carbon fibres. The fibres should be aligned around the hole based on previously calculated load paths. The example shows two fibre splines around the hole, which are implemented as beam elements and constrained as embedded elements in the matrix. The plate is put under uniaxial tension.
According to the symmety the stress distribution in the upper and lower spline should be the same. I tried different boundary conditions and different mesh styles and sizes. Furthermore the coordinates of the splines are completely symmetric and placed in the center of the plate.
So i am wondering about the cause of this antisymmetry...


Thanks for your help!

https://files.engineering.com/getfi...9d7c-205ed74bc025&file=open_hole_plate_bc.png

https://files.engineering.com/getfi...d&file=open_hole_plate_stress_x_direction.png

https://files.engineering.com/getfi...712c09837&file=splines_stress_x_direction.png

 

[FEA way]

First of all take a look at the displacement plot and deformed shape. Check if it's also asymmetric. Then make sure that everything (shape, material, beam profile, mesh, BCs) is the same for both fibre splines.