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Python 3 library to automate and build finite element analysis (FEA) models in Calculix. Meshing uses Calculix or GMSH.
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teobo/pycalculix
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Description: pycalculix is a Python 3 library to automate and build finite element analysis (FEA) models in Calculix. Meshing uses Calculix or GMSH. Website: http://justinablack.com/pycalculix/ Source Code: https://github.com/spacether/pycalculix Documentation: http://spacether.github.io/pycalculix/pycalculix.html Usefull applications of Pycalculix: -Trade studies for plane stress, plane strain, or axisymmetric parts -Quick Kt analysis of 2D geometry -Learning finite element analyis (FEA) and Python Folder layout: The folders of this project are laid out to allow me to distribute it on pypi. Pypi link: https://pypi.python.org/pypi/pycalculix Note: the main body of pycalculix code is in pycalculix/feamodel.py module Notes, Cutting Areas: I built a chunker in python which tries to cut big areas (> 5 sides) which cgx can't mesh into smaller areas (<= 5 sides) which are meshable in cgx. The chunker may not always be able to cut areas correctly. License: See LICENSE.txt (GPL v2) Creator: Justin Black, justin.a.black[at-sign]gmail[dot]com Initial Release: December 2014 Elements Supported: Axisymmetric, plane stress, and plane strain elements are supported. First and second order triangles and quadrilaterals are supported. First order elments only have corner nodes Second order elements have corner and midside nodes Second order elements produce more accurate results Setting element divisions on lines is supported Geometry Building: One can build separate parts made of points, lines, arcs, and areas. Straight lines and arcs are currently supported. One can draw a part made of straight lines, then smooth out corners by adding arcs with the part method: part.fillet_lines(L1, L2, arc_radius) The new arc will be tangent to both adjacent lines. Loading: Force loading Constant pressure Linearly varying pressure (water pressure) Gravity Rotational speed forces Displacement constraints Loads are stored on geometry primitives (points lines, areas) and can be applied before or after meshing. Getting Started: 1) To run a pycalcuix file you have to have pycalulix installed, see Installation below 2) The you can then write your own pycalculix programs or run one of the example files in the eamples folder on github: https://github.com/spacether/pycalculix/tree/master/examples 3) To run a file: WINDOWS: Graphical user interface: Double click the file: if the .py extension is associated correctly you can double click it to run the .py program Console: 1) cd into the directory with your .py file in it 2) type: python the_program.py where the_program.py is the name of the file that you are running This assumes that python3 is your active python installation LINUX: Console: 1) cd into the directory with your .py file in it 2) type: python3 the_program.py where the_program.py is the name of the file that you are running Files Produced: Meshing and solving are done in the background using cgx or gmsh for meshing, and Calculix ccx for solving. Files Used: *.fbd (Calculix cgx gemetry file) *.inp (Calculix solver input file, or mesh definition) *.geo (Gmsh geometry file) *.msh (Gmsh native mesh file) *.frd (Calculix ccx nodal results file, values are at nodes and were created by interpolating element integration point results back to the nodes) *.dat (Calculix ccx element results file, includes integration point results) Installation: pycalculix requires the below software: Python3+ Numpy (S1,S2,S3 calculation) Matplotlib (plotting) Calculix (solving) Gmsh (meshing) EASIEST INSTALLATION: WINDOWS: 1) Install Anaconda* python 3.4: http://continuum.io/downloads#py34 This includes required libraries like numpy and matplotlib. Note: 64-bit: This is an easier option for 64 bit systems because the binaries of the other libraries are harder to find. 32-bit: *Rather than installing anaconda you can just install python 3+ from the python site: https://www.python.org/downloads/release/python-343/ When you install pycalculix in the next step below, the required libraries will autoinstall on your system. 2) In a console window, type: pip install pycalculix Note: This installs the calculix and gmsh programs in sub-folders in the python pycalculix folder. Running these included binaries from pycalculix only works for windows. 3) You are done! See 'Getting Started' LINUX (assumes Ubuntu 14.04) 1) Install required prerequsisites. In the console enter: sudo apt-get install python3-pip python3-matplotlib gmsh Note: this installs pip (a python library downloader) for python 3 python3 matplotlib (the required matplotlib library needed for plotting) gmsh (software needed to mesh you FEA models) 2) Install both calculix ccx and calculix cgx for your architecture (32 or 64 bit) Ubuntu 14.04.1 (Trusty) -------- 32-bit: -------- ccx: https://code.launchpad.net/~cae-team/+archive/ubuntu/ppa/+build/7043228/+files/calculix-ccx_2.7-0%7E1%2B6%7Eubuntu14.04.1_i386.deb cgx: https://code.launchpad.net/~cae-team/+archive/ubuntu/ppa/+build/7043230/+files/calculix-cgx_2.7-0%7E1%2B3%7Eubuntu14.10.1_i386.deb -------- 64-bit: -------- ccx: https://code.launchpad.net/~cae-team/+archive/ubuntu/ppa/+build/7043227/+files/calculix-ccx_2.7-0%7E1%2B6%7Eubuntu14.04.1_amd64.deb cgx: https://code.launchpad.net/~cae-team/+archive/ubuntu/ppa/+build/7043229/+files/calculix-cgx_2.7-0%7E1%2B3%7Eubuntu14.10.1_amd64.deb 3) In the console window type: pip3 install pycalculix 4) You are done! See 'Getting Started' Separate Installs: Install Python 3+: https://www.python.org/downloads/release/python-342/ Install numpy: http://sourceforge.net/projects/numpy/files/NumPy/1.9.1/ Install matplotlib: http://matplotlib.org/downloads.html Install Calculix: http://www.calculix.de/ Linux Version: http://www.dhondt.de/ Windows Version: http://www.bconverged.com/download.php#calculix Install Gmsh: http://geuz.org/gmsh/#Download pip install pycalculix Then pass locations to ccx, cgx, and gmsh per the example on the pycaculix site: http://justinablack.com/pycalculix/ Anaconda: An installation package that includes Python and many python libraries Anaconda includes the below Python3+, Numpy, and Matplotlib. If you are a Python beginner, I suggest downloading and installing it rather than the separate installers. Url: http://continuum.io/downloads#py34 Optional Software: Suggested IDE (program to edit and run python programs): Wing IDE: http://wingware.com/downloads/wingide-101 Version Updates: 0.9.3 ADDED: Import CAD geometry from dxf file See pycalculix.CadImporter ADDED: Element results plotting added Element results plotting: pycalculix.Problem.rfile.eplot() Nodal results plotting: pycalculix.Problem.rfile.nplot() Number Formatting: Strain results now use scientific formatting Others use nearest 10**3 suffixes Max and min values now listed above the colorbar ADDED: method to draw an arc by swept angle in degrees part.draw_arc_angle(degrees_ccw, center_x, center_y) ADDED: min_val and max_val can now be passed to eplot and nplot This lets the user set the results range that they want to see: min_val <= colored results <= max_val Values under and over are greyed out, darker under, lighter over ADDED: internal holes in parts One can make circular holes, or draw complicated holes. See example 7 ADDED: Added set_ediv method to FeaModel class. This method sets the number of elements on a line. line.set_ediv still works. ADDED: Robust selection object: feamodel.view This object is feamodel.view Most important methods are: view.select_all, view.select, view.allsel_under All plotting now uses the current selection set SYNTAX: updated how parts, materials, problems are made Make part: pycalculix.FeaModel.make_part or pycalculix.Part Make material: pycalculix.FeaModel.make_matl or pycalculix.Material Make problem (previously called model): pycalculix.FeaModel.make_problem or pycalculix.Problem Make Results File: pycalculix.Problem.rfile or pycalculix.ResultsFile(problem) FIX: Plotting fix, closing triangles in the correct direction in matplotlib DOC: All code separated into modules for clarity. DOC: Docstrings added to all classes + methods + functions PLOTTING: Closed areas are now filled in yellow when plotting geometry. PLOTTING: Signed line names are shown and internal to the area. BACKEND: Implimented signed line and signed arc class. Pressures can now be applied on these signed lines. Many methods and variables made private to clean up name space. TODO: Add tutorial videos Update pdf Improve Pylint Scores: feamodel 9.28 geometry 9.02 results_file 9.75 part 9.64 selector 9.89 mesh 9.66 loads 9.80 cadimporter 9.71 problem 9.82 base_classes 9.51 components 10.0 material 10.0 environment 9.39 connectors 9.57 Future Goals: -CAD import of: brep, step, iges can make geo files with gmsh: gmsh freecad_part.iges -o out_iges.geo -0 gmsh freecad_part.brep -o out_brep.geo -0 gmsh freecad_part.step -o out_step.geo -0 Importing the geo file: Do points need explicit numbers? no, store them in a dict points[geo_str] = point Need to convert spline to arcs if it's a circle or arc >= 180 Will need to delete some points + make center point -Ability to make a new field (% yield etc) -Double check effective strain calculation: http://orange.engr.ucdavis.edu/Documentation12.0/120/ans_thry.pdf pg 23 + 24 https://support.tnodiana.com/manuals/d944/Analys/node405.html https://books.google.com/books?id=70vvzjngyQEC&pg=PA21&lpg=PA21&dq=equivalent+strain+principal+strain&source=bl&ots=bPj4dHfddy&sig=X6MAdyeq34X9uNQRZ1poKXHZK9c&hl=en&sa=X&ei=lr2_VL_lM4q4ggS7loHICw&ved=0CFwQ6AEwCQ#v=onepage&q=equivalent%20strain%20principal%20strain&f=false -Is my element stress calculation correct? Should it be an average, or a centroid val? http://mostreal.sk/html/elem_55/chapter2/ES2-2.htm http://orange.engr.ucdavis.edu/Documentation12.0/120/ans_thry.pdf#page=536&zoom=auto,32.4,582.228 -Add area chunker around arcs -Add part offset function to offset a line and close an area -Add contact between parts -Add compression supports model.make_compr_support('L5', 10) make new part with new line loop, not closed, new line set ndivs on both lines (only needed if before meshing) make connector object pre mesh: make gap elements after meshing post mesh: clone the existing nodes with new node numbers, make gap eles -Reaction force fix? -Coupling nodes under points and lines ("gluing") This would allow 'correct' stresses for knock up at discontinuities -Add struct-thermal and thermal support -Order faces under slines to be sequential so they can be output later -Order nodes under slines to be sequential so they can be output later -Add mp4 maker -Bolted joint example perhaps, nodal thickness on bolt and nut areas -Interactive selection? -Face plotting? -Aluminum can model? -https://www.youtube.com/watch?v=hUhisi2FBuw
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Python 3 library to automate and build finite element analysis (FEA) models in Calculix. Meshing uses Calculix or GMSH.
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