We use cookies from thirth parties to inprove your experience and our services. If you do not close this window we understand that you allow its use. For more information about cookies click here

Beam deflection - Hand calculations vs Code_Aster vs Midas MeshFree vs Experiment

May , 18th 2019 | Author: Michał Szulewski (@) Read: 3139 times

Before downloading it... Share it!

| Download article | Times downloaded: 557

Few weeks ago I participated in Midas MeshFree software demonstration. It isn't another classic FEM tool, but something fresh on simulation market. This software doesn't require creating mesh on CAD file. Sounds interesting, isn't it?

I decided to check it by making some comparison with classic FEM tool Code_Aster and by making some experiment.

At home conditions I created a test stand. I used things, which you can find in garage or buy in DIY store: an old book shelf, a vice, an electronic scale, PA38 alu flat bars, a roman screw and a caliper as below.

Figure 1. Hand test

The roman screw worked as a tensioner. I applied ~0.7kG of force:

Figure 2. Load ~0.7kG of force – applied by adjusting roman screw

Next I had to measure the deflection:

Figure 3. Measurement of the deflection f = 3.74mm

Vertical deflection amounted to around f = 3.74mm. Each alu bar had 175mm length, 20mm width and 3mm height.

Hand calculation of the deflection

I used linear approach and classic beam solution, which assumes low max deflection ( about beam thickness )

Figure 4. Hand calculations  of the deflection f = 3.091mm


Hand calculation gave vertical deflection f = 3.091mm

Code_Aster vs MIDAS MeshFree solution

One edge was fixed (ux=uy=uz=rotx=roty=rotz=0). Horizontal and vertical force was applied to a single node on opposite edge. Linear approach. In MIDAS MeshFree I set similar conditions. Below you can find both solutions:

Code_Aster solution ( vertical displacement ) below:

Figure 5. Code_Aster solution of the deflection f = 3.056mm

Analysis with Code_Aster gave results f = 3.056mm

MIDAS MeshFree ( vertical displacement ) below:

Figure 5. Midas MeshFree solution of the deflection f = 3.049mm

Analysis with Midas MeshFree gave results f = 3.049mm.

I received 4 different values of deflection:

  • experiment f=3.74mm
  • hand calculation f=3.091mm
  • Code_Aster f=3.056mm
  • MIDAS MeshFree f=3.049mm

Not bad results for home conditions. The biggest unknown was material property. I had to trust tables. I could calculate Young modulus from the deflection, but I wanted to check it without correlation.

After this study I decided to spend more time in the future with this topic and get more detailed comparison. Especially solver settings and mesh adjustment. What is curious MIDAS has mesh, but volumetric not associated with geometry. It is numerical method borrowed from CFD solutions

Next article with detailed comparison will appear soon.

Copy Rights reserved

Michał Szulewski

CAE Engineer

Visit my profile on linkedin https://www.linkedin.com/in/michalszulewski/

| Download article | Times downloaded: 557

If you like it, share it!

Share in Facebook
Share in Google+
Cargando comentarios...
¿Do you want to publish in Prontubeam? Send us your name, mail and subjet of the article. We will get in touch with you as soon as possible
Full name:
Email adress:
Subjet of the article:
I am not a robot:
Subscribe: Prontubeam in your mail
I accept the privacy policy
About the author
Michał Szulewski . Business owner Caetica || Senior CAE Engineer Airbus || Aerospace || R&D || FEM Analyst. Michał Szulewski Linkedin
Vote the article
Puntuación de artículo: 4/5 (basado en 1 votos)
Prontubeam - Verify, calculate, check... the Civil Engineering starts here.
This website has been created by Carlos Corral. More information about cookies click here
The author of this website is not responsible for any possible error in the formulation used. The user has to verify all the results by his own.