Hi Matej,
For an assembly with an interference fit it is often appropriate to use Union, when studied from the structural mechanics point of view. But if sliding could occur, then an Assembly should be used together with contact modeling. Whether the materials are the same or not does not really make a difference here.
If you study the heat transfer problem, then there will often be a significant thermal resistance at the interface, even if there is a large contact pressure between the surfaces. So in that case you need to use either an Assembly, or a Union with a 'Thin Layer' condition and the boundary.
In the Viscoplastic Solder Joints model, the connections between the materials are assumed to be 'perfect' which is reasonable for e.g. soldered or welded joints.
Using contact conditions will significantly increase your analysis time, since it adds a severe nonlinearity to your model. But it should not increase the memory requirements significantly.
Regards,
Henrik
For an assembly with an interference fit it is often appropriate to use Union, when studied from the structural mechanics point of view. But if sliding could occur, then an Assembly should be used together with contact modeling. Whether the materials are the same or not does not really make a difference here.
If you study the heat transfer problem, then there will often be a significant thermal resistance at the interface, even if there is a large contact pressure between the surfaces. So in that case you need to use either an Assembly, or a Union with a 'Thin Layer' condition and the boundary.
In the Viscoplastic Solder Joints model, the connections between the materials are assumed to be 'perfect' which is reasonable for e.g. soldered or welded joints.
Using contact conditions will significantly increase your analysis time, since it adds a severe nonlinearity to your model. But it should not increase the memory requirements significantly.
Regards,
Henrik
