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[FAQ]

CINT,SURF is needed to define the crack faces for the solver so that it knows the boundaries of the crack for remeshing purposes. Crack top and bottom faces need to be defined in the nodal component, and this is to help the solver understand the location of the crack. CINT,SURF indicates to the solver the two halves of the crack, and CINT,CTNC (or CINT,CENC) indicates where the crack front is located – this provides a complete description of the crack to the solver. (Otherwise, the solver will only ‘see’ nodes and elements and may not be able to automatically determine where the crack is, so this is why CINT,SURF is needed.)