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Frequently Asked Questions (FAQ)
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It is not possible to outsource the calculation to a cluster for RFEM.
A possible way to relieve the workstation computer of complex calculations is as follows: RFEM is installed on a well-equipped terminal server .
Each employee, who has to perform complex calculations, will be provided with an access to the server via Remote Desktop.
This option requires network licenses.
The Viewer for RFEM and RSTAB are nothing more than a full versions limited in their functionality.
RFEM and RSTAB are designed for the x86 processor architecture that is used in the majority of desktop computers and notebooks. 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 Remote Desktop Client (for example, from Microsoft) on your tablet. This allows for a remote control of your office computer via the tablet.
In principle, it is possible to run our software on a Microsoft Surface Tablet. Please make sure that the tablet is equipped with the 64‑bit version of Windows 10. The latest versions of RFEM and RSTAB are only available for 64‑bit Windows.
However, a problem is that these tablets are only equipped with the Intel graphics chip. The OpenGL implementation in its graphics driver is not very good. This may lead to crashes. The problem of the current graphics driver is that the nodes may not be displayed in RFEM and RSTAB.
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. In this case, there are the limits 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 only speeds up the calculation insignificantly.
You, can add your own programs to the menu "Add-on Modules → External Modules."
For this, open the file "C:\Program Files\Dlubal\RFEM 5.XX\RFEM.ini" with a text editor. It is necessary to run the text editor with the administrator rights.
The following three lines show exemplary how the Windows text editor Notepad can be inserted in the menu:
The nonsymmetric solver is able to improve the convergence. However, it should only be activated if there are really convergence problems.
For certain material models, you can also be requested to activate the nonsymmetric solver.
In the case of the "normal" equation solver, it is necessary to only save one side of the matrix as it is symmetric to the main diagonal. In the case of the nonsymmetric solver, it is necessary to save both sides and also create them previously, of course. This requires more memory and longer processing time.
For a model that converges well anyway, the nonsymmetric solver only leads to a longer computing time and is of no use.
The problem was caused by the incorrect update of the BitDefender signature database. To fix the problem, update the BitDefender signature database.
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 SHAPE‑MASSIVE program is only available as a 32‑bit version. However, you can also use it on a computer with the 64‑bit operating system.
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
“Thank you for the valuable information.
I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. I have used a lot of software with a support contract in the field of structural analysis, but your support is by far the best. ”