RFEM – Online Manual

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RFEM – Online Manual

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11.7.1.4 Generating solids

Generating solids

The previous chapter describes how existing surfaces can be used to create solids or casings. If you want to generate a completely new solid, however, RFEM provides special functions for creating 3D objects: First, create the surfaces (rectangle with roundings, semi-circle, etc.). In a second step, extrude the surfaces in relation to a point or a plane.

Extruding a surface in relation to a parallel plane

To access the corresponding function, use the menu option

    • Insert → Model Data → Solids → Graphically → Extrude Tapered

or the corresponding list button in the menu bar.

Figure 11.145 Extrude Surface list button

The menu contains a multitude of planar surface shapes that can be defined graphically and then extruded parallel to the surface plane.

The functional principle is similar to the graphical input of surfaces (see Chapter 4.4): First, define the material and stiffness in a dialog box. Then you can create the surfaces in the work window by clicking the definition points.

Figure 11.146 New Half Annular Surface dialog box for a graphical definition of the surface

Once the base area is defined, specify the parameters for creating the solid in the Extrude dialog box.

Figure 11.147 Extrude Half Annulus Tapered dialog box with inclined lateral surfaces

The Height h can be entered directly in the dialog box or determined graphically with the mouse. The projection direction is always orthogonal to the plane of the base area.

By entering a value in the Tapering dialog section, you can create a parallel cover or base area with inclined sides. The angle β describes the inclination towards the projection direction.

In addition, the Material of the new solid must be specified.

Extruding a surface in relation to a point

To access the corresponding function, use the menu option

    • Insert → Model Data → Solids → Graphically → Extrude to Point.

The menu contains a large number of planar surface shapes that can be defined graphically and then extruded in relation to a point.

The functional principle is similar to the extrusion of the object in reference to a parallel plane (see above): First, define the base area graphically. Then you can enter the extrusion's projection point in the Extrude dialog box or define it graphically.

Figure 11.148 Extrude Semi Circle to Point dialog box with result