Re: Torque
by Robert Cimrman
In examples/large_deformation/hyperelastic.py a rotation by displacements is applied. By using a similar function the vectors defining the force couples could be defined for dw_surface_ltr (IMHO). Does it make sense?
r.
----- Reply message -----
From: "Andre Smit" <freev...(a)gmail.com>
To: <sfepy...(a)googlegroups.com>
Subject: Torque
Date: Sat, Dec 18, 2010 05:10
What is the best way to apply a torque load to a model?
--
Andre
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1 year, 1 month
1D line elements in SfePy
by Nimish
I am currrently looking for FEM packages to help me solve a system of
beams and columns, basically a collection of 1D bernoulli/timoshenko
line elements.
I started reading SfePy docs and i am getting the idea that doing the
above is not really possible here, am i right?
Are only 2D area elements permitted in SfePy?
Or is there any direct support for solving 1D line elements too..
Cheers
Nimish
3 years, 3 months
SfePy system-wide installation
by G.L.
Hi !
First of all, congratulation for this great piece of software !
I was trying to build and install SfePy system-wide (2014.1 or 2014.2), but
ran into troubles. I followed the instructions on the website ("python
setup.py build", then "python setup.py install").
There was no special error during the build (some warnings from gcc) or the
installation.
However, when I try to run the tests, nothing is working :
> 79 test file(s) executed in 0.55 s, 92 failure(s) of 103 test(s)
The errors are due to python that fails to import SfePy modules :
./run_tests.py --debug tests/test_cmesh.py
> ....
> ....
> ....
> File "tests/test_cmesh.py", line 96, in test_cmesh_counts
> from sfepy.discrete.fem import Mesh
> File "/scratch/packages/sfepy-2014.2/sfepy/discrete/__init__.py", line
> 8, in <module>
> from variables import Variables, Variable, FieldVariable,
> create_adof_conns
> File "/scratch/packages/sfepy-2014.2/sfepy/discrete/variables.py", line
> 12, in <module>
> import sfepy.linalg as la
> File "/scratch/packages/sfepy-2014.2/sfepy/linalg/__init__.py", line 1,
> in <module>
> from extmods.crcm import rcm, permute_in_place
> ImportError: No module named crcm
I don't understant, because everything is installed in my
/usr/local/lib/python2.7/
(I run an ubuntu 14.04)
If I do an inplace build, everything works fine (but I really want to
install SfePy system-wide...)
I really don't know how to fix that... any idea ?
Thank you very much !
G.
4 years, 5 months
Working with several materials simultaneously
by Santiago Puerto
Hello! Im Santiago Puerto, student of engineering from the Universidad
Distrital Francisco José de Caldas - Bogotá - Colombia.
This is my first Sfepy implementation, i wonder if a FEM mesh can contain
multiple material ids (with different physical properties each one).
My project is an asphalt mixtures aging simulator, i use X-Ray CAT images
to reconstruct an asphalt mixture sample, then run a scaling and segmenting
process in order to store the model in three dimensional numpy array. Now
im working to transform the digital reconstruction on a FEM mesh but i
don't want to lose the material detail (Identifying the material from the
mixture, it's position and properties) gained with the X-Ray CAT images
processing.
4 years, 6 months
ANN: SfePy 2014.3
by Robert Cimrman
I am pleased to announce release 2014.3 of SfePy.
Description
-----------
SfePy (simple finite elements in Python) is a software for solving systems of
coupled partial differential equations by the finite element method or by the
isogeometric analysis (preliminary support). It is distributed under the new
BSD license.
Home page: http://sfepy.org
Mailing list: http://groups.google.com/group/sfepy-devel
Git (source) repository, issue tracker, wiki: http://github.com/sfepy
Highlights of this release
--------------------------
- isogeometric analysis (IGA) speed-up by C implementation of NURBS basis
evaluation
- generalized linear combination boundary conditions that work between
different fields/variables and support non-homogeneous periodic conditions
- non-constant essential boundary conditions given by a function in IGA
- reorganized and improved documentation
For full release notes see http://docs.sfepy.org/doc/release_notes.html#id1
(rather long and technical).
Best regards,
Robert Cimrman and Contributors (*)
(*) Contributors to this release (alphabetical order):
Vladimir Lukes, Matyas Novak, Zhihua Ouyang, Jaroslav Vondrejc
4 years, 6 months
Thanks!
by Daniel Wheeler
I'd just like to say thanks for the help with the periodic displacement
boundary conditions. This was the major stumbling block to our first
release of PyMKS (http://openmaterials.github.io/pymks/).
Sfepy is now the data generator for the learning algorithm in PyMKS. We did
have other solver choices, but we decided on Sfepy because it is both
scriptable from Python and can solve linear elasticity (and now the
periodic displacement BC). However, as a third party requirement, it needs
to be relatively easy to install, which was the most important factor
--
Daniel Wheeler
4 years, 7 months
3D displacement issues with order=3
by Daniel Wheeler
I'm trying to extend the linear combination example to 3D. During the
debugging, I noticed that I couldn't solve a simple displacement problem in
3D with "order=3" or "order=2" integrals. The gist contains the code I'm
trying to run
https://gist.github.com/wd15/8274429e3b4179c3d74f
The gist only has displacements with no linear combination or periodic
boundary conditions. The image produced seems to be badly distorted without
the expected symmetry.
Should this work with an "order=3" integral or does it need to be
"order=1"? Does this require changing the solver parameters in some way?
Thanks.
--
Daniel Wheeler
4 years, 7 months
