In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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It is not possible to outsource the calculation to a cluster for RFEM.
One way to relieve the workstation computer of complex calculations is as follows: Installation of RFEM on a well-equipped terminal server .
Each employee who has to carry out complex calculations will be provided with access to the server via remote desktop.
Network licenses are required for this option.
In fact, the Viewer for RSTAB and RFEM present full versions that are restricted in their functionality.
RSTAB and RFEM are designed for the x86 processor architecture that is used in the majority of desktop computers and notebooks. The tablets are based on a different processor architecture (ARM) and operating system.
However, there is an option to use the viewer. To do this, you would need to install a Remote Desktop Client (for example from Microsoft) on your tablet. This allows you to remotely control your office computer using the tablet.
In principle, our software runs on a Microsoft Surface Tablet. Make sure that the tablet is equipped with the 64-bit version of Windows 10. The latest versions of RSTAB and RFEM are only available for 64-bit Windows.
However, one problem is that these tablets are all equipped only with an Intel graphics chip. The OpenGL implementation in its graphics driver is not very good. This may lead to crashes. A problem of the current graphics driver is that the nodes are not displayed in RSTAB and RFEM.
It depends on the specific case.
If the iterative solver has to be used because the main memory is not sufficient for using the direct solver, it makes sense to expand the memory so that the direct solver can be used. There are limits, which are given by the hardware (processor, mainboard) and the operating system.
If the RAM is sufficient to use the direct solver, the further upgrade of the RAM speeds up the calculation only insignificantly.
You can open your own programs in the menu "Add-on Modules> "Add-on modules".
To do this, open the file "C: \ Program Files \ Dlubal \ RFEM 5.XX \ RFEM.ini" with a text editor. The text editor must run with administrator rights.
The following three lines show how the Windows text editor Notepad can be inserted in the menu as an example:
ModuleName2 = Notepad
ModuleExeName2 = C: \ WINDOWS \ System32 \ notepad.exe
ModuleDescription2 = Editor
The asymmetric equation solver can improve the convergence. However, it should only be activated if there are really convergence problems.
For certain material models, you are also prompted to activate the unsymmetric equation solver.
When using the "normal" equation solver, only one side of the matrix has to be stored because it is symmetric to the main diagonal. In the case of an unsymmetric equation solver, both sides have to be saved and, of course, created beforehand. This takes more RAM and a longer processing time.
For a model that already converges well anyway, the unsymmetric equation solver leads to a longer computing time.
The problem was caused by an incorrect update of the signature database of BitDefender. Update the signature database of BitDefender to correct the problem.
Finite elements with plastic material are divided into 10 layers. First, a normal elastic analysis is performed in the first iteration. Then, the stress in each element is calculated according to the set strength hypothesis in each individual layer. If the limit stress in one of the layers is exceeded, the stiffness of this layer is reduced. Based on the reduced stiffnesses of the 10 layers, an overall stiffness is determined for each element. With this new stiffness, we start a new calculation iteration.
Iterates until the changes are only small.
The total stress is converted into the stresses of the individual layers by means of the laminate theory. This theory is also applied for the conversion between the stiffnesses of the layers and the total stiffness.
4 different strength models can be used as the limit stress:
- Shape Change Energy Hypothesis (von Mises-tension)
- Shear stress hypothesis (Tresca stress)
- Failure hypothesis according to Drucker-Prager
- Failure hypothesis after Mohr-Coloumb
The choice of the failure hypothesis is shown in Figure 1.
The von Mises hypothesis is preset because it is the most frequently used strength theory.
AnswerThe program DICKQ is only available as 32-bit version. However, you can also use them on a computer with a 64-bit operating system.
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