Hello,
This is propably a primitiv question but I am trying to figure out how to implement a moment at the tip of a (for simplification) beam around the z axis. It should follow the nodal rotation in a dynamic case. When using Abaqus this is quite simple: I get a reference point in the middle of the surface (end of beam) that is supposed to rotate and couple it to the mentioned surface, with a Coupling card. Then I load the reference Point with a Moment (CLOAD)
.....
*nset, nset=end
2, 4, 6, 8, 2, 4, 6, 8, 12, 13, 14, 18, 19, 20,
*nset, nset=RP
711
*SURFACE,NAME=moment,TYPE=NODE
end,
*COUPLING,REF NODE=711,SURFACE=moment ,CONSTRAINT NAME=C1
*KINEMATIC
....
*STEP
*DYNAMIC
....
*CLOAD
RP, 6,10
*STEP END
When doing this similar in CalcuiX nothing happens for the dynamic case. I am able to do it in a static calculation though!
I also tried loading the moment on the nodes of the surface directly or just around the middle line. Also nothing happens. When loading a force though it works.
I am quite new to CalculiX and at our department nobody worked with it before.
I would really appreciate if somebody could help me and give me a hint.
Thank you very much!
Hi Jonas, sorry for the late answer but I check this profile not very often.
Did you solve your problem?
If not, can you share the whole input file?
I'm not a really *DYNAMIC user, by the way with a quick check at the *CLOAD I found this:
"The AMPLITUDE parameter allows for the specification of an amplitude by which the force values are scaled (mainly used for nonlinear static and dynamic calculations). Thus, in that case the values entered on the *CLOAD card are interpreted as reference values to be multiplied with the (time dependent) amplitude value to obtain the actual value. At the end of the step the reference value is replaced by the actual value at that time. In subsequent steps this value is kept constant unless it is explicitly redefined or the amplitude is defined using TIME=TOTAL TIME in which case the amplitude keeps its validity."
Cheers
Enrico
Hi Jonas
It has been a while since I last used CalculiX. Then, it only used Solid elements even though using beam element specifications as inputs. Solids, as you know, tend to have only translation degrees of freedom.
To see if I am barking up the right or wrong tree, use a force couple as input and compare it with a moment excitation.
Claes
Beam Element is used you can apply load and moments on nodes.you can give translation (displacement ) and slopes at nodes and obtain reaction forces developed as output
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