To model fracture
Below You can see my structure which has been cut its 1/4 to only see inside it. It is exerted axial compression force to crush.
I have to have fracture at the connecting of rings with inner and outer tubes due to shear and/or tensile stress( Fig 2) . What does come to your minds to model this fracture?
My approach is using Contact_TIED_SURFACE_TO_SURFACE_FAILURE according the Fig3 and Fig4.
Am I on the right track?
You won't be able to use that card as those mesh connections share nodes currently. You could do what you are proposing by splitting off the connecting rings into their own part and then disconnecting them from the outer and inner rings. If you do this, you can also try *Contact_automatic_surface_to_surface_tiebreak. However, both of these contact based failure methods will only impact the interface between the outer and inner connection points, not the material itself.
If you wanted to define failure in the material as a whole, you could use *Mat_Add_Erosion, *Mat_Add_Damage_Gissmo, or *Mat_Add_Damage_Diem. Each of these would require you having a critical strain value/curve for failure, not stress.