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Frequently Asked Questions (FAQ)
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Perhaps the input parameter for the surface is missing. In the model file of the FAQ, the axis of the surface refers to a line that has obviously been deleted before. Thus, it is not clear how to create the axis system for the surface.
There are two simple solutions:
- Select a line to which the x- or y-axis should be parallel.
Image 02 - Definition of Axes
- Switch back to the default setting.
- Select a line to which the x- or y-axis should be parallel.
AnswerAfter creating the two nodes, for which you want to display the displacement, you should ensure that they belong to the surface.If these two nodes are not connected to a line, it is necessary to integrate them in the mesh to be considered in the calculation with finite elements.To integrate these objects that are not used in the mesh, click the Calculate menu → FE Mesh Settings, which opens the FE Mesh dialog box. In this dialog box, select the Integrate unutilized objects into surfaces check box.After the calculation, you can see the displacement of these nodes in Table 4.2 Nodes - Displacements.
When using a layered FE mesh for solids, it is unfortunately not possible to keep the user-defined axis orientation because the layers are always in the z‑direction, and thus the axis definition is determined automatically.
As an alternative, you can use an FE mesh refinement, see the figure.
There is no option for viewing the FE mesh nodes in RFEM along with those areas but it is possible to export them to an Excel sheet. You can do this by following the steps in Figure 01.
In Figure 02 the coordinates of the FE mesh nodes are exported to Excel.
Also, exporting the FE mesh as a .dxf file into AutoCAD can be done. Using the direct export option in RFEM, select the FE Mesh option. See this in Figure 03.
Another option is to go to File - Export and then select the following format.
Then, under the Geometry tab, check off the boxes below.
The general FE mesh settings can be modified using the IFeMeshSettings interface. This interface is located under IModel > IModelData > ICalculation. Figure 01 shows which elements can be modified / displayed.
Here is a code example where the target length of the FE elements is set to 100 mm. Furthermore, the division of the members with the same element size is activated and the minimum division is set to 3 elements:Sub mesh_params()Dim iApp As RFEM5.Application' get interface for model dataDim iModel As RFEM5.modelSet iModel = GetObject(, "RFEM5.Model")On Error GoTo eIf Not iModel Is Nothing Then' get interface for application and lock licenceSet iApp = iModel.GetApplication()iApp.LockLicense' get interface for model datDim iModdata As RFEM5.IModelData2Set iModdata = iModel.GetModelData' get interface for calculationDim iCalc As RFEM5.ICalculation2Set iCalc = iModel.GetCalculation()' get interface for mesh settingsDim iMeshSet As RFEM5.IFeMeshSettingsSet iMeshSet = iCalc.GetFeMeshSettings' get general mesh settingsDim meshGen As RFEM5.FeMeshGeneralSettingsmeshGen = iMeshSet.GetGeneralmeshGen.ElementLength = 0.1' set new general mesh settingsiModdata.PrepareModificationiMeshSet.SetGeneral meshGeniModdata.FinishModification' get mesh member settingsDim meshMem As RFEM5.FeMeshMembersSettingsmeshMem = iMeshSet.GetMembersmeshMem.DivideStraightMembers = TruemeshMem.ElementLength = 0.1meshMem.MinStraightMemberDivisions = 3' set new mesh member settingsiModdata.PrepareModificationiMeshSet.SetMembers meshMemiModdata.FinishModificationiApp.UnlockLicenseEnd Ife: If Err.Number <> 0 ThenMsgBox Err.description, , Err.SourceEnd IfiApp.UnlockLicenseSet iApp = NothingSet iModel = NothingEnd Sub
The subroutine is also completed by an error interceptio routine (On Error GoTo e) and the Prepare-/FinishModification block is required as in the case of modifying other elements. Here, the block is created via the IFeMeshSettings interface.
If you have performed a calculation in RF‑CONCRETE Surfaces, the results are available on FE mesh nodes and on grid points.
If you set a user-defined result value in a surface, an interpolated value from the existing values from the calculation in RF‑CONCRETE Surfaces is displayed on the FE mesh nodes first. This interpolated value is displayed while the user-defined result value is being set (when moving the mouse pointer over the surface).
If closing the command to set the user-defined result value (ESC key), RF‑CONCRETE Surfaces recalculates this actual value at this location. As a consequence, the solver window is displayed briefly. Depending on the complexity of the calculation, this solver window is only displayed for a short time or several seconds.
Due to the initial display of the interpolated values and the subsequent calculation of the actual result value, there may be small differences.
AnswerIf you want to consider the load cases again, please perform a new RWIND Simulation calculation. If you want to perform the calculation of the existing combinations, please remove the RWIND Simulation load cases from the Wind action before deleting the FE mesh, then the combinations are created again and it is possible to perform the calculation.
AnswerYes, the results can be partially exported. The export function is available for the result tables in the add-on module (as of Window 2.1).Using the example of the steel stress in SLS, it would be possible to only perform the steel stress analysis and then export the table in Window 3.3, for example.When displaying the table in Window 3.3, you can choose between FE mesh points and grid points. The grid can be adjusted as a property of the surface.
AnswerIf the distorted elements are so small that they cannot be detected (see Figure 01), it is recommended to "Display Mesh Quality Annotations." You can find this option in the Display navigator → FE Mesh → FE Mesh Quality. There, you can activate the annotations for the "Warning" and "Failure" elements (see Figure 02). Thus, you can immediately recognize where the location is by using the values. For larger models, it may be helpful to hide the model during the search.
AnswerIn most cases, the problem is that the finite elements of the cover surfaces are very close to each other in the edge area of the cushion when using Bézier surfaces. The FE mesh nodes of the bottom and top surface might be combined then. In principle, there are two approaches:1. Numerical solution of the problem:You can adjust the tolerance for combining FE mesh nodes by using the menu "Tools" → "Regenerate model."2. Geometrical solution of the problem:A more workable solution is to increase the distance between surfaces by using the boundary surfaces as shown in Figure 01.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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