One way of looking at it might be to say that "Bonded" or "Shared Topology" represents analisys on an assembly of welded componants,...a "Contact" scenario might represents analisys on an assembly of bolted componants,...in "Shared Topology" the "Mesh-Nodes" are shared & they touch at points where the indevidual parts touch,...in "Contact" the "Mesh-Nodes" are not shared?
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