Base Tutorial. Topic. Finite Element Analysis. Level If the solver CalculiX is not installed see FEM Install. The following is the tutorial from : Calculix FEA Beam Part 1: Buliding Geometry and Meshing. This article is the first. Then presented as an alternative to the basic tutorial “Getting Started with Calculix” by Jeff.
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The solver is able to do linear and non-linear calculations. However, there is no standard way of doing this, so each vendor has created his own modifications without necessarily publishing them.
This page was last modified on 30 Januaryat The standard shape functions for quadratic elements are very good. Navigation menu Personal tools Log in. Based on a work at www. For the ease follow of this tutorial the different used and generated files named on the different chapters are available for download, allowing the user to skip or compare any step of the tutorial by its own.
The program is primary controlled by the keyboard with individual commands for each function. The calculations were done to determine the burst-speed and the highest allowable rotational speed concerning low cycle fatigue and creep. The CalculiX package was developed by a team of enthusiasts in their raw spare time.
Also, a cut through the model can be done which creates a section and it is possible to zoom through the model. By Sebastian Rodriguez — [Libre Mechanics] . Click HERE to see the example of the turbo-charger turbine. Applying the finite element method to real-life problems is not always a piece of cake.
Advanced CalculiX Tutorial
Therefore, most finite element programs modify the standard shape functions for linear elements to alleviate these problems. The memory needed to run a problem depends on the largest node and element numbers the computational time, though, does not. For a quick overview of the capabilities of CalculiX the results of an investigation of a small jet engine are presented.
Shaded animations of static and dynamic results, the common color plots and time history plots can be created. Most of the documents recurses as images and this tutorial its available at the sourceforge page. This program uses the openGL library for visualization and the glut library for window management and event handling.
If the former is incorrect, so will the latter be.
For linear elements this is not the case: Retrieved from ” http: Usual FEA applications involve analysis where multi body assemblies are loaded to determine the contact behavior between each other, some of this data are cxlculix, relative displacement and contact pressure. You can easily verify whether the thicknesses you specified are correct. In addition the eigenfrequencies were calculated to determine possible resonances with the vanes.
Check the quality of your mesh in CalculiX GraphiX or by using any other good preprocessor. This kind of cases of study are specially complex and requires much more technological resources uttorial to the nonlinearity characteristics of the case, where a slight change on the geometry, mesh or frontier conditions overcome on a totally different behavior.
The iterative scaling method cf. CalculiX FE-Model of a jet engine with turbo-charger compressor blue and turbine red. The models are meshed with 20 noded brick elements with reduced integration.
So if you notice large gaps in the numbering, get tutorizl of them and you will need less memory.
Permissions beyond the scope of this license may be available at http: In addition the eigenfrequencies were calculated to determine possible resonances with the vanes. Please keep in mind that any file may vary from user to user by the meshing and computational conditions, but it does not meaning this difference will represent an error of processing.
The method used is the finite element method. The FE-model was build from scratch with CalculiX and the compressor- and turbine models together with solver input files can be found in the distribution.
The jet engine was build around a turbo-charger rotor in the early 90’s by Andreas Funke and Klaus Wittig.
Contact information can be found at the bottom of the “Download” page. According to my experience, the following guidelines are quite helpful:. Especially achieving convergence for nonlinear applications large deformation, nonlinear material behavior, contact can be quite tricky.
Although it contains a graphical display area and certain model selection activities are made possible through the computer mouse, most of the work is done by typing text on a command line. For this precise tutorial it will be assumed that the user its already familiar with the working tutorizl of CalculiX CCX and CGX modules, if this is not the case it is recommendable to refer first to some beginner tutorial for example: After the analysis is completed on CCXthe results can be visualized by calling the CGX program again in an tytorial session.
This tutorial is intended as a reference or starting point for those who choose to use more high-performance software and control. This is due to the characteristics associated with engineering free-software currently available. Only a subset of commands which are most important for post-processing is also available through a pop-up menu.
CalculiX is a package designed to solve field problems. The compressor is made of casted aluminum alloy AlSi – C and the turbine of a high temperature alloy Inco C and both are loaded by pure centrifugal force.
This results in very high speed if a hardware-accelerated openGL-library is available and still high speed for software-rendering MesaGL.
Advanced CalculiX Tutorial | Libre Mechanics
The models are meshed with 20 noded brick elements with reduced integration. Click HERE for the jet-engine-model and documentation. That way you get the expanded form of these elements in the.
Furthermore, you get the 3D stress distribution.
Static, dynamic and thermal solutions are available. PDF Usual FEA applications involve analysis where multi body assemblies are loaded to determine the contact behavior between each other, some of this data are friction, relative displacement and contact pressure.
If you include contact in your calculations and you are using quadratic elements, first avoid to include tutorual nodes in the slave surface.