Boundary condition-Assign an accelleration

Hello,

to apply an acceleration for static analysis (gravity...),
you will need to edit the Code-Aster command file (.comm) in the Eficas editor:
1) create a simple analysis with the Wizard (like in the Piston tutorial)
2) in Aster module, right click on the .comm file in the model tree, and run the Eficas Editor.
3) in Eficas (I am currently writing a tutorial on that...), in the left tree, click on the AFFE_CHAR_MECA command (=affect mechanical loads)
4) now on the right side of the Eficas window, click on the "Nouveau Mot clé" tab (which means "new keyword" => shows all the possible loads that can be applied). Now from the keyword list, double click on "Pesanteur" (=gravity), then in the "array editor" that shows up, enter the gravity magnitude and the 3 components of the acceleration direction in the "Valeur" field for example type (9.81, 0, 0, 1) and press the left arrow button to define a 9.81 m/s2 gravity in Z direction. Finally validate by pressing "Valider"
5) save the file: in the Fichier (=file) menu, select Enregistrer (=save) or just press CTRL+S.

That's it for a static analysis. To run a dynamic analysis it is more or less the same to define the loads, but you will need to use a dynamic solver like DYNA_LINE_TRAN solver instead of MECA_STATIQUE for example.

Good luck

Joël Cugnoni