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2 points

·
9th Aug 2018

FreeCAD dev here. Just wanted to say I think FreeCAD's future in this regard is bright. Besides the Calculix integration you already mentioned, we have a CFD Workbench in development which integrates with OpenFOAM, as well as experimental integrations with Elmer and FEniCS.

We've just finished a rewrite of the parametric part design stuff and are doing the same for real assembly support, so once that is done (as well as finishing the transition to Qt 5 & Python 3) it will be possible to focus on usability improvements that would tie everything together very nicely.

I'm also working on improving the state of packaging in the Debian Science Team so Debian/Ubuntu as a platform will become much better for doing engineering.

(BTW we just redesigned our homepage for anyone interested in FreeCAD!)

2 points

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10th May 2018

You could possibly use the MATLAB FEA Toolbox and model the whole cross section as a full 3D linear elastic problem. Otherwise a 1D Euler-Bernoulli beam simplification might be suitable.

2 points

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18th Sep 2016

The keyword you are looking for is *truss elements*. Any of the major finite element packages will include this capability. You can download the free version of ANSYS here. Since trusses are the simplest possible element type you'll also find very simple scripts written in languages like MATLAB or Python online in course material. It's often taught as an introduction to the finite element method. You can use those if you rather skip on the huge download of ANSYS and the learning curve involved with such a general purpose tool.

2 points

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17th Jun 2021

Have you checked the Ansys Learning Hub https://www.ansys.com/services/ansys-learning-hub , their content is very structured which I like. Also might help with your PhD topics as they have groups for specific topics. For deep understanding on the Math do check out https://brilliant.org/

2 points

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11th Apr 2017

I have uploaded the force input and acceleration output here: https://files.fm/u/z3sst5yb

For me the acceleration should be 0 at t=0 then start to increase, at the middle of the bridge it should reach its maximum the start to decrease.

As you can see from the acceleration output I get that the acceleration is largest at t=0 then decreases.

REMARK: The acceleration are taken in the midpoint of the bridge!

1 point

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2nd Aug 2022

I fully recommend this book https://www.amazon.com/Principles-Finite-Element-Method-Matsci/dp/190265353X I have used it many times to mentor people and bring them into the FEA sphere. It is full of easy examples to work through and will take a few nights to work through. It os really worth it. After that you can pick and choose your resources.

1 point

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19th Feb 2022

If you need a more design centered FEA book there " FEA for.mechanical design engineers". It doesnt get into the mathematical theory of FEA. Its great for work and to learn hownto use FEA in a design sense, without mastering the mathematics behind it. (Galerkin method, finite diferences, variational methods, etc) If you are serias about FEA, then check: https://www.amazon.com/Finite-Elements-Approximation-Dover-Engineering-ebook/dp/B00C8UQZMM

The author is the father of FEA

1 point

·
26th Nov 2016

I previously was generating my run through the interface yeah, but I think you're correct suggesting the APDL.

What i want to do is plot a graph of moment vs rotation of a selected surface, for a selection of geometry parameters.

Essentially something like this:

(expect instead of considering pressure, I want to vary my geometry in a similar fashion).

Thanks for the reply!

1 point

·
15th Jan 2016

I already tried that before but it has trouble converging to solutions. It "gives" a solution but it has the orange/red thingy in stead of a green "v" check. I've added a printscreen in the first link. Second link is a pdf of the solver output it it would be any help.

Thanks in advance though

http://imgur.com/Bbcsefh http://www.filedropper.com/cprogram20filesansys20incv145aisoldesignspaced

1 point

·
4th Oct 2014

You need to run a modal analysis, then you run a random vibration with those results. You probably want to copy your ansys db so you dont mess up your results. Your results are statistical, so keep that in mind. You probably want to report your 3 sigma results to be conservative... So you would find your max displacement in your model after you run the analysis, and then you will find your stress response vs. frequency. If that's too confusing, you will probably want to read up on it on the internet... try this: http://www.ansys.com/staticassets/ANSYS/staticassets/resourcelibrary/article/AA-V2-I3-Random-Vibration-Fatigue.pdf

http://ansys.net/ansys/tips/week23-random_vibrations_tow.pdf

and try searching 'psd' at ansys.net Or read some posts at xansys.org

1 point

·
8th Oct 2016

For a very simple 2d model, something like matlab/octave or Python's matplotlib (or even excel) will work fine. For anything more, I'd suggest writing the data to legacy VTK format (pdf), which is well suited to plotting finite elements (e.g. beams). You can then plot this in paraview, which is a fully-featured postprocessing package that will do pretty much anything with a bit of effort.

1 point

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27th Jul 2018

Thanks, I appreciate it. Certainly not concerned if I have to wait a bit. There's two files. #1 has twice the amount of faces as 2.

I've converted from STL to STEP and IGES but it still gives me grief. It'll either crash or give me an error halfway through the run.

1 point

·
21st Oct 2020

I found A First Course in Finite Elements by Jacob Fish and Ted Belytschko really helpful during my masters.

1 point

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25th Jul 2020

This is the textbook we used in my Finite Element Analysis class. It’s focused on theory and more of a college coursework textbook, not really for reference and not about the software.