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APPfemLinear

Binder

Linear FEM programme in Python, using Abaqus/Calculix input file, Python solver and Paraview postprocessing

Objective: personal use, for education, quick verification, unit testing, fun, whatever. It Supports multiple materials, element types and load types (concentrated & distributed) in the same problem.

Content:

  • FEA2D-JOBNAME.py: Python job script which calls the input file (JOBNAME.inp), the program (LinearFEMProgram) and writes the output files (JOBNAME-output/output-igpoints.vtk). Users define the basic dimension data, element types, materials, loads, boundary conditions. They should match the element type, nsets, elsets in the input file.

  • JOBNAME.inp: the Abaqus input file, single part is supported, nsets for boundary conditions and elsets for different element/material types. It is used only to provide mesh, node set and element set information.

  • JOBNAME-output(-igpoints).vtk: vtk outputs of displacements and stress/strain (at igpoints), visualize using Paraview.

  • LinearFEMProgram: contains all the source codes of the linear FEM program, job-independent.

  • Examples: contains the script, input & outputs of some example problems

Run:

  • run the FEA2D-JOBNAME.py using Spyder or something equivalent. It will generate the outputs automatically in this directory.
  • Keep the FEA2D-JOBNAME.py and the corresponding input file in this directory when running.

How to create inp file using SALOME (free preprocessing software: https://www.salome-platform.org/)

  1. create the geometry and the mesh following the standard salome procedure (see tutorial: https://www.youtube.com/watch?v=TbZDXt_VSTE)
  2. create the groups for boundary conditions and loads
  3. remove the boundary elements using "Modification-remove-elements-set filter-create-free boundary"
  4. export into .unv format
  5. download unv2ccx.exe from https://github.com/calculix/unv2ccx, it is a program to transform .unv file to .inp file
  6. extract the unv2ccx.exe in a convenient folder, say under Desktop. Open cmd, in Windows type ".\unv2ccx.exe xxx.unv" the xx.inp will be automatically generated. It can then be used with APPfemLinear.