http://www.dem-solutions.com/support/files/examples/Cohesion.zip
Package includes three identical particle types which are rolled down a slope. The three particle types have varying cohesive properties from no cohesion to high cohesion.

Please take a look at the code for your own project and remember to come back and post up any modifications or code snippets which will help other users along the way. Feel free to use this forum for asking questions about this contact model.
DEM Solutions Team.