Abaqus Cae - Contact Crack under compressive load

Question

Abaqus Cae - Contact Crack under compressive load

TVVIw (Student)

(OP)

29 Oct 23 22:35

Hello

I'm trying to simulate an open hole (2D) with a crack, submitted to a compressive load. I'm trying to estimate the Stress intensity factor in this condition, however, I have an interpenetration of the elements from each side of the crack, as you can see in Fig 2. I tried to generate a "general contact" for the whole structure, but it does not work. For a tensile load, it seems to work correctly, but it's very weird for compression. Does anyone can help me to generate the contact?
Fig1 -Tensile load - no problem with crack seam and J-integral

Fig 2 Compression - problem with contact in the crack seam

Fig3-Interaction module:

Fig4-Contact properties:

Kind regards

SWComposites (Aerospace) · Answer 1 · 2023-10-29 23:33:55

Are you sure you have plotted displacements 1:1?

The tensile load image doesn’t look like a typical crack opening displacement.

SWComposites (Aerospace) · Answer 2 · 2023-10-29 23:35:30

Oh, and why is there a good mesh on one side and an ugly mesh on the other side?

FEA way (Mechanical) · Answer 3 · 2023-10-30 12:57:50

General contact considers self-contact by default (when All with self is set like in your case). Set the deformation scale factor to 1 and check the COPEN results to see if there are significant penetrations.

TVVIw (Student) · Answer 4 · 2023-11-01 15:51:53

Hello,

Thank you very much for your help. @SWComposite Indeed, I didn't plot the displacement 1:1. I'm also working to fix the mesh, it was just an initial attempt to model the problem

@FEA way: I selected all options in F-output, including COPEN. However, the COPEN wasn't computed. Besides, as you can see below, the CPRESS is zero. Does it mean that the contact is not correctly generated, right?

Kind regards

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Abaqus Cae - Contact Crack under compressive load