Learning Forum

[Marco_Rigon]

Hi,

I'm doing easy exercise for a course at university but I'm not able to apply any force to nodes. As soon as I do the command Preprocessor--> Loads-->Define Loads-->Apply-->Structural-->Force-->On nodes and I put the value and direction I receive a warning that say 'specified forces from the previous F command were applied only to the selected NODAL LOAD set'. In result of this no force were applied to my model (if I go into List-->Loads-->Forces it tells me 'no nodal force to list'). The model is very easy, i'm using link 180 elements and I have 3 nodes. How can I fix this? Thanks if you can help me

error.png

[Erik Kostson]

Hi there seems to be something with the UI in vers. 2021 R2, and this might be defect (thanks for brining it to our attention - it will hopefully be fixed in the next upcoming releases).

Use input files and commands straight away (most of the apdl use is not via the ui, only command inputs - actually there are some things we can not do with the UI, and can only be used via command inputs).

So for a nodal force use:
F,1,FX,100
(explain: !!!! F, NODE NR, Lab, VALUE, VALUE2, NEND, NINC)

Also see the F command for more info on how to use it.

There are many tutorial in the help manual showing the input files for simple models that you can go through.

E.g., verification manual example 3 (VM3).

So use the command inputs and solve them directly and do not use the UI so much if possible.

All the best

Erik

[Marco_Rigon]

Thank you so much, it works. Have a nice day
Best regards