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FAQ 002676 EN

25 March 2019

Sonja von Bloh Modeling | Structure SHAPE-THIN

How can I model roundings, chamfers, etc.?

Answer

Irregularities in the cross-section geometry can be represented with point elements. They can be added as a fillet, rectangle, circle, or triangle or removed from member surfaces. In this way, you can additionally consider or exclude the area of the point element for the cross-section properties.
To insert point elements, select the menu Insert -> Cross-section Data -> 1 5 Point elements or by using the corresponding button in the toolbar (see Figure 1).
No stresses are shown for scaling elements.
Point elements are not considered in the calculation of the torsional moment of inertia. In the Calculation Parameters dialog box, you can compensate for this with a correction factor, for For example, you can define pronounced roundings.

Moreover, you can create corners and edges of the cross-section with fillet radii and bends using the function "Create Round or Angled Corner". To open the corresponding dialog box, use the menu option Edit -> Creating Round or Angled Corner (see Figure 2). In the Corner Type dialog section, specify if the corner zone should be rounded or angled. Depending on the setting, you can enter the Fillet radius r or the Reduction of lengths l1 and l2 in the Parameters dialog section.
Then, without closing the dialog box, both elements are displayed in the work window by mouse click
to select. In the "Creating Between Elements No." section display the numbers of the elements
displayed.
If the check box Separate Elements is active, RFEM creates a result after creating the arc
Deletes the projections of the original elements in the corner zone of a new element. The option
Delete Corner also removes the node in the corner.

In addition, corner zones can be modeled true to detail with the function "Smooth Corner" without using rectangular point elements (see Figure 3). To access the function, select Edit -> Smoothen the corner. Then, click one of the two elements in the intersection zone of the work window. The relevant element side is shortened and the adjacent element side is extended accordingly. A Null element establishes the connection between the elements.

Keywords

Point element Chamfer Trimming Rounding Rounding Round off Angling Even

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Cross-Sections Thin-Walled
SHAPE-THIN 8.xx

Cross-Section Properties Software

Section properties, stress analysis, and plastic design of open and closed thin-walled cross-sections

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