Force applied on joints
- AndreaF
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18 years 3 months ago #1045
by AndreaF
Force applied on joints was created by AndreaF
Hi to all.
First of all I'd like to greet all in this forum.
In these days I'm trying to simulate a particular 3d object.
I have precalculated the forces on the joints of the structure (equilibrium of the the system) and I'd like to apply it on the respective pins joints (imagine a simple bar with four holes 6mm Diameter. The overall lenght of the bar is 235mm).
I'd like to know in which way I can apply correctly the forces on the Hole. Phisically speaking, in the holes of pin joint, the distribuition of forces will be parabolical (Hertz theory). I dont't know how to recreate this situation in Salome/Code Aster.
Many many thanx
Andrea
First of all I'd like to greet all in this forum.
In these days I'm trying to simulate a particular 3d object.
I have precalculated the forces on the joints of the structure (equilibrium of the the system) and I'd like to apply it on the respective pins joints (imagine a simple bar with four holes 6mm Diameter. The overall lenght of the bar is 235mm).
I'd like to know in which way I can apply correctly the forces on the Hole. Phisically speaking, in the holes of pin joint, the distribuition of forces will be parabolical (Hertz theory). I dont't know how to recreate this situation in Salome/Code Aster.
Many many thanx
Andrea
- Joël Cugnoni
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18 years 3 months ago #1053
by Joël Cugnoni
Joël Cugnoni - a.k.a admin
www.caelinux.com
Replied by Joël Cugnoni on topic Re:Force applied on joints
The best way is to use the FORCE_FACE option of AFFE_CHAR_MECA.
With this command you can apply a stress on a face with a given orientation (the unit used by Force_Face is a pressure!!)
You can also define a non-uniform loading if you use AFFE_CHAR_MECA_F command and FORCE_FACE option.
To define the pressure distribution, you will need to define a function with DEFI_FONCTION (functions in Aster means interpolated function) or an analytic formula with FORMULE.
In the present case, using FORMULE will be probably the simplest way to define the distribution.
A sample code will look like this:
PZ1=FORMULE(VALE='1e3*(X-1.02)*(X-1.02)',NOM_PARA='X')
PRESS=AFFE_CHAR_MECA_F(MODELE=YourModel,FORCE_FACE=_F(FZ=PZ,...)
By the way, be very carefull, and try to double check your formulas, because a small mistake in the coordinates can dramatically change the applied pressures!!
Regards,
Joël Cugnoni
www.caelinux.com
With this command you can apply a stress on a face with a given orientation (the unit used by Force_Face is a pressure!!)
You can also define a non-uniform loading if you use AFFE_CHAR_MECA_F command and FORCE_FACE option.
To define the pressure distribution, you will need to define a function with DEFI_FONCTION (functions in Aster means interpolated function) or an analytic formula with FORMULE.
In the present case, using FORMULE will be probably the simplest way to define the distribution.
A sample code will look like this:
PZ1=FORMULE(VALE='1e3*(X-1.02)*(X-1.02)',NOM_PARA='X')
PRESS=AFFE_CHAR_MECA_F(MODELE=YourModel,FORCE_FACE=_F(FZ=PZ,...)
By the way, be very carefull, and try to double check your formulas, because a small mistake in the coordinates can dramatically change the applied pressures!!
Regards,
Joël Cugnoni
www.caelinux.com
Joël Cugnoni - a.k.a admin
www.caelinux.com
Moderators: catux
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