Hi, i'm performing a fatigue analysis based on the Paris law via XFEM using Abaqus. My analysis consist of two steps: in the first one the crack is created by defining a damage criteria (MAXPS) in the bulk material, while in the second one the crack is propagated using direct cyclic analysis including low-cycle fatigue (Paris law is implemented in the keyword). I want to obtain the strain energy release rate from the output. I select it from the field odb manager but it does not appear in my output. I saw that this is a contact output so i suppose that in order to obtain the ERR i need to define two surfaces and propagate the crack through these surfaces (VCCT). In my problem the crack is created from the bulk material so no surfaces are defined. How can i obtain ERR? (the crack propagate based on the Paris law, so Abaqus calculate the ERR around the crack tip in some way but i can't obtain it from the output). Thank you in advance for the support.
What Abaqus should be doing is exactly what you've described. Once a crack is created in the bulk according to your criterion, the newly created crack faces are automatically defined as surfaces. ERRs are calculated by Abaqus to solve the criterion for propagation, which is based on VCCT calculations if you select VCCT as the option for *FRACTURE CRITERION, TYPE.
However, as far as I know, ERRs are saved to odb only as history output, not field output. Otherwise, they're reported in the DAT file when *CONTACT PRINT is used.
In Abaqus there are option for solution (performing fatigue analysis)
Options are-
1. VCCT
2. XFEM
3. Energy Criterion.
you can choose any of them but energy criterion is better because it also works for solution of anisotropic materials and you can get both stress intensity factor as well as energy release rate via J-integral.
Dear Luca thank you for your suggestions. In practice how i can request *CONTACT PRINT ? thank you in advance
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