I am currently trying to model a specimen containing a semi-elliptical surface crack under cyclic loading conditions. A seam has been defined and a contour integral crack implemented. This works under monotonic tensile loading, but under cyclic loading the crack faces overlap during the compressive part of the cycle. Is there any way to define contact between the faces of the seam crack to prevent them from overlapping under compressive loading? I need to maintain a contour integral crack as I wish to calculate contour integrals. I have encountered difficulties assigning contact since the seam crack faces are not strictly separate surfaces.
I would greatly appreciate any advice on this matter.