DesignModeler-Concept Modeling

A. Concept Modeling

The features in the Concept menu are used to create and modify line bodies and/or surface bodies which become FE beam or shell models.

To begin Concept Modeling, you can either:

– Create line or surface bodies using the features in the Draw toolbox to design a 2D sketch and/or generate a 3D model

– Use the Import external geometry file feature

Line bodies can be created using the concept modeling tools:

– Lines from points

– Lines from sketches

– Lines from edges

Surface bodies can be created using the concept modeling tools:

– Surfaces from line bodies

– Surfaces from sketches

– Surfaces from 3D edges

B. Creating Line Bodies

Lines From Points:

– Points can be any 2D sketch points, 3D model vertices or Point Feature (PF) points.

– A point segment is a straight line connecting two selected points.

– The feature can produce multiple Line Bodies, depending on the connectivity of the chosen point segments.

– The Operation field allows Add or Add Frozen choices for line bodies.

Example of “Line From Points” using 2D points from a rectangular sketch.

2 points are chosen to define a diagonal line body. The green line indicates proposed line segment.

Apply the selection then Generate. The Line body is displayed in blue.

Lines From Sketches:

– Line bodies created based on sketches and planes from faces

– Multiple Line Bodies may be created depending on the connectivity of the edges within the base objects

– Select sketches or planes in the feature tree then “Apply” in the detail window

– Multiple sketches, planes, and combinations of sketches and planes can be used as the base object for the creation of line bodies

Example of “Lines From Sketches”.

Sketch created as input for Line Body creation.

“Lines From Sketches” is chosen:

-Highlight sketch in tree

-Apply as base object in Detail window

Lines From Edges:

– Creates line bodies based on existing 2D and 3D model edges

– Can produce multiple line bodies depending on the connectivity of the selected edges and faces

– Can select edges and/or faces through two fields in the detail window then “Apply”

Example of “Lines From Edges”. 3D solid created as input for Line Body creation.

“Lines From Edges” is chosen:

Select faces on model. Face boundaries will become line bodies (alternately select 3d edges directly).

Apply as base object in Detail window

-Note: in this case 1 line bodies are created due to the edge connectivity.

C. Modifying Line Bodies: Split Edges

Split Line Body:

– Splits line body edges into two pieces

– Split location is controlled by the Fraction property (e.g. 0.5 = split in half).

Other Options:

– Split by Delta: Distance between each split is given by Delta along the edge

– Split by N: Number of Divisions of the Edge

D. Cross Sections

– Cross sections are attributes assigned to line bodies to define beam properties in the FE simulation

– In DM, cross sections are represented by sketches and are controlled by a set of dimensions

Note: Design-Modeler uses a different coordinate system for cross sections than the one used in the ANSYS environment (described later)

Cross sections are selected from the Concept menu

A cross section branch is inserted in the tree where each chosen cross section is listed

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