So I have this interface fracture mechanics problem I am simulating in Abaqus 2021 and it's not performing as intended (hoped).
- Problem: Crack on curved bimaterial interface (fiber-matrix interface)
- I am after energy release rates GI and GII of a crack along the interface.
- Since it's a bimaterial interface GI and GII can't be calculated from KI and KII (complex SIFs for a crack on an interface between dissimilar materials)
- VCCT works but manually doing it takes too long for the high number of analyses I need.
- My approach is to define a VCCT interaction to extract GI and GII
- Model of with discrete crack tip verified by analytical calculations through KI and KII.
- Verifying with same material for fiber and matrix so analytical LEFM solution can be applied
- This should verify the mesh, BCs etc. are as intended.
- Model with identical mesh, materials, BCs etc. but VCCT interface -> ENRRT11 (GI) and ENRRT12 (GII) are similar to but too far from analytical results.
- Fracture energies are deliberately set very high to ensure the crack does not propagate since I am only interested in GI and GII.
- Just to be clear this also simulates a crack in a homogeneous material serving as verification before moving on to dissimilar materials.
