## 3.7. Guide to Solid Modeling

In the case of thick composites, the layered shell theory can cause significant errors in the obtained results. In some cases it is necessary to work with 3-D models (solid models). ACP has the advanced features to generate layered solid models based on the shell layup definitions. Based on the shell mesh and the ACP composite definitions, ACP generates layered solid elements representing one-to-one the composite part. Drop-offs, staggering and tapering are also considered. In addition the solid model extrusion allows to define extrusion directions, boundary curves, and cut-outs.

The following sections give a brief guide to Solid Modeling:

- When to Use a Solid Model
- How to Use the Solid Model Feature
- Principles of Solid Model Generation
- Drop-off and Cut-off Elements
- Workflow
- Practical Tips
- Known Limitations

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