## 4.2. Analysis of a Composite Solid Model

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 3D models - also referred to as Solid Models. ACP has the unique feature to generate layered solid models based on the shell layup definitions. ACP generates layered solid elements based on the shell mesh and the ACP Composite Definitions thus 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 and boundary curves.

In this section, the workflow of modeling a composite solid is outlined as it differs to some extent from shell modeling. Selected steps that differ from shell modeling are explained in more detail below and highlighted with a link.

- Preprocessing

  - Add ACP (Pre) component to the project

  - Define Engineering Data

  - Import or construct Geometry

  - Open the Model and

    - Define Named Selections/Element Sets

    - Generate Mesh

  - Open ACP (Pre) and

    - Define Fabric

    - Define Rosettes and Oriented Selection Sets

    - Create Modeling Plies

    - Create Solid Model

- Workbench Analysis System

  - Choose an Analysis System (WB Mechanical/Mechanical APDL)

  - Add Analysis System to the project

  - Add other systems

  - Open the Analysis System and

    - Define Analysis Settings

    - Define Boundary Conditions

  - Solve model

- Postprocessing

  - Post-process complete assembly

  - Add ACP (Post) component to the project

  - Open ACP (Post) and run the post-processing for composite parts

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