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A simple Finite Element program

Project Description
# SolidsPy: 2D-Finite Element Analysis with Python


![Wrench under bending.](./docs/img/wrench.png)

This _repo_ contains a simple finite element analysis code for 2D elasticity
problems. The code uses as input simple-to-create text files defining a model in terms of
nodal, element, material and load data.

## Features
The code allows the user to find the displacement, strain and stress
solution for an arbitrary two-dimensional domain discretized into finite
elements and subjected to point loads. It has been created for
academic purposes and it is part of the teaching material developed for
the courses IC0602 Introduction to the Finite Element Methods and
IC0285 Computational Modeling at Universidad EAFIT. The code is organized
in independent modules for pre-processing, assembly and post-processing
allowing the user to easily modify it or add features like new elements.

The _repo_ contains 5 main folders:

1. `solidspy/` which stores the source code in the following modules:

- `solids_GUI.py`: The main program;
- `preprocesor.py`: Pre-processing subroutines including [Gmsh](http://gmsh.info/) convertion functions using [`meshio`](https://github.com/nschloe/meshio)
- `assemutil.py`: Assembly of elemental stiffness matrices ;
- `femutil.py`: Shape functions, its derivatives and general finite element method subroutines;
- `uelutil.py`: Elemental or local matrix subroutines for different elements; and
- `postprocesor.py`: Several results handling subroutines.

2. `meshes/` Complete models including its Gmsh representation and a Python script to produce the required
(nodes, elements, materials and load) text files ready for input.

3. `docs/` Documentation files in the form of easy-to-follow tutorials
showing how to define a SolidsPy model in terms of text files and model
creation with [Gmsh](http://gmsh.info/).

4. `examples/` Specific applications using SolidsPy functions to conduct analysis.

5. `tests/` Unit testing scripts.

## Installation
The code is written in Python and it depends on `numpy`, `scipy` and `sympy`.

To install _SolidsPy_ open a terminal and type:

pip install solidspy

To run the examples with specification of the folder stoing the input files through a GUI you will need to install
[`easygui`](http://easygui.readthedocs.org/en/master/).

To easily generate the required SolidsPy text files out of a [Gmsh](http://gmsh.info/) model
you will need [`meshio`](https://github.com/nschloe/meshio).

These two can be installed with:

pip install easygui
pip install meshio

## How to run a simple model
After installation, you can run an analysis in 3 easy steps (see [template](./docs/template/README.md)):
- Create the model (i.e., geometry and mesh) using [Gmsh](http://gmsh.info/). Several meshes are available in the repo [`SOLIDSPy-meshes`](https://github.com/AppliedMechanics-EAFIT/SolidsPy-meshes)
- Generate the text files (eles.txt, nodes.txt, mater.txt and loads.txt) required by _SolidsPy_ using
a python script based on [`meshio`](https://github.com/nschloe/meshio).
- Run it in Python as follows:

```python
import matplotlib.pyplot as plt # load matplotlib
from solidspy import solids_GUI # import our package
solids_GUI() # run the Finite Element Analysis
plt.show() # plot contours
```

## License
This project is licensed under the
[MIT license](http://en.wikipedia.org/wiki/MIT_License). The documents are
licensed under

[Creative Commons Attribution License](http://creativecommons.org/licenses/by/4.0/).

## Authors
- [Juan Gomez](http://www.eafit.edu.co/docentes-investigadores/Paginas/juan-gomez.aspx),
Professor at Universidad EAFIT.
- [Nicolás Guarín-Zapata](https://github.com/nicoguaro), Researcher at the Applied Mechanics Group
at Universidad EAFIT.


Release History

Release History

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1.0.8

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