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NFORCE vs FSUM

NFORCE vs FSUM

NFORCE vs FSUM

(OP)
Hi,

Can someone please explain what the differences between the Nforce are and Fsum command.
in what applications are they used?

Thanks

RE: NFORCE vs FSUM

FSUM
Sums and prints, in each component direction for the total selected node set, 
the nodal force and moment contributions of the selected elements attached to the node set. 

NFORCE
Sums and prints, in each component direction for each selected node, the nodal force and moment contributions of the selected elements attached to the node.  

NFORCE includes the FSUM command, but also lists the individual contribution from each node.

RE: NFORCE vs FSUM

(OP)
Thanks for the answer.

I understand the definitions.

But for example i tried a simple of case of a double simple supported beam and if i select only one element and one node of this element the NFORCE and FSUM commands are not given the same result. According to the definitions the results should be the same right?

RE: NFORCE vs FSUM

Ok,
Can you share a small APDL-snippet that reproduces this behaviour?

RE: NFORCE vs FSUM

(OP)
Find in annex a simple example.
In this case if a fixed supported beam with a uniform distributed load.

RE: NFORCE vs FSUM

(OP)
I think that I already understand it is related with the point where FSUM is doing the momentum equilibrium.

RE: NFORCE vs FSUM

They should indeed be the same, when I run your code I get the same output from both FSUM and NFORCE. The code below shows a typical usage of fsum and nforce, and they behave as they should:

/prep7  
k,  
k,2,1   
k,3,2   
l,1,2   
l,2,3   
et,1,189
lesize,all,,,4  
lmesh,all   
DK,1,UY, , ,0,UX,UZ,ROTX,ROTY, , ,   
DK,2, ,,, , ,UY,UZ
DK,3, ,,, , ,UY,UZ
F,8,FY,1000  
!*  
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,EX,1,,200e9  
MPDATA,PRXY,1,,0.3  !*  
SECTYPE,   1, BEAM, CTUBE, , 0  
SECOFFSET, CENT 
SECDATA,0.001,0.002,0,5,0,0,0,0,0,0,0,0 
SECTYPE,   1, BEAM, CTUBE, , 0  
SECOFFSET, CENT 
SECDATA,0.001,0.002,0,5,0,0,0,0,0,0,0,0 
allsel  
FINISH  
/SOL
solve
/post1
set,last
ETABLE,MI,SMISC,3   
ETABLE,MJ,SMISC,16  
PLLS,MI,MJ,1,0  

spoint,8
nsel,s,loc,x,0,0.75
fsum
nforce
 


Hopefully this can give some guidance.
Cumprimentos
Peter

RE: NFORCE vs FSUM

(OP)
Thanks for you help.

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