Fracture VCCT or CZM - Contact Type

Hello, I'been going through your help website and customer portal and I've seen many examples on how to model fracture, but one thing that keeps disturbing me is the type of contact you are using in the different examples. Depending on each one you use: Bounded, Frictionless or you suppress it directly, results change. It's very confusing because no criterion is given or no explanation and I'm getting different results depending on which one I use. Can anybody give me a good criterion for which one to use? Specially for VCCT. Thanks

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