### 3.7.2. How to Use the Solid Model Feature

The intention of the solid model feature is to generate analysis models for structures that are built in one piece.

The feature itself makes no distinction between generating solid element models that are analyzed in isolation or ones that are analyzed in combination with other components. There is however a distinct difference in how the analysis of a solid element model of multiple components can be approached. The components of an assembly can either be extruded individually or extruded as one assembly. Both approaches are possible within ACP yet they both have advantages and limitations.

The recommended approach is to generate individual components and connect them using contacts in a Workbench Analysis System. This follows the intention that Solid Models are only created for components that are to be built in one piece. Additional connecting structures can be also fully modeled or dimensioned with the help of substitute model.

The other approach is the extrusion of an entire assembly in one solid model generation. This method is not only limited by the topological complexity of a geometry but also by a reduced stiffness at transitions as a result of drop-off elements. On the other hand, this approach offers the ability to model all connecting structures in full.

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