Possible to provide external file as input for loads?

1

Hi,

Is it possible to provide time varying loads as an input file to calculix?
If yes, please do share how and an example will be very useful.

Thanks

1 Like
2

Use *INCLUDE to insert another file in a .inp file. You can use it within a keyword card so instead of a single .inp file containing

*AMPLITUDE,NAME=MyAmplitude
0,0
0.1093,0.02727062618244
0.1511,0.03763142250748
*CLOAD,AMPLITUDE=MyAmplitude
3,1,1

use

*AMPLITUDE,NAME=MyAmplitude
*INCLUDE,INPUT="MyTimeFunction.txt"
*CLOAD,AMPLITUDE=MyAmplitude
3,1,1

and the file MyTimeFunction.txt which contains the (time, force) ordered pairs:

0,0
0.1093,0.02727062618244
0.1511,0.03763142250748
3 Likes
3

Thanks very much for clarifying with good example.
May I know if it’s possible to provide force instead of pressure, as force will have 3 components?
Taking this one step further, is it possible to provide pressure or force as a function of time and space?

4

Use a separate *CLOAD card and *AMPLITUDE for each component if you want them to be different functions of time. Or, if they’re all proportional to each other (i.e. a force with a constant direction but changing magnitude), you could use the same *CLOAD and *AMPLITUDE but different scale factors on each DOF in the *CLOAD card.

I don’t think CCX can do a function of position unless it’s one of the built-in ones like centrifugal force. It has a *DISTRIBUTION card but only for orientations, as far as I know. You may have to use external software to generate individual *CLOAD or *DLOAD card/line for each node or face.