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August 24, 2024 at 5:46 pm
www.chanees777
SubscriberHi I am doing buckling analysis on a curved panel whose schematic I have attached. I have been trying to do buckling analysis on this geometry for different cases but results dont seem to be matching with theoretical. Can someone please guide me whats wrong in my code? Lets consider this case a=b=50mm, Theta=180 degrees, E= 200MPa, t=0.5, poisson ratio=0.3. Thank you very much.
/CLEARÂ Â Â Â
/PREP7 Â
smrt,off
ANTYPE,STATIC Â
ET,1,SHELL63,,Â
R,1,0.5 Â
MP,EX,1,200e9Â
MP,NUXY,1,0.3 Â Â
R1 = 31.38
L = 25
PI = 4*ATAN(1)
T=PI/2
THETA =T*180/PI
CSYS,1Â
K,2,R1,90,L
K,3,R1,(90-THETA),L
K,5,R1,90,-L
K,6,R1,(90+THETA),L
K,7,R1,(90-THETA),-L
K,8,R1,(90+THETA),-L
l,3,2 Â Â
l,2,6 Â Â
l,3,7 Â Â
l,7,5 Â Â
l,5,8 Â Â
l,6,8
lcomb,1,2
lcomb,4,5
al,1,3,4,6
LESIZE,ALL, , ,24, ,1, , ,1,
amesh,1
lsel,s,line,,3
lsel,A,line,,6
nsll,,1
D,ALL, , , , , ,UY, , , , ,
lsel,s,line,,4
nsll,,1
D,ALL,, , , , ,, , , , ,UZ
lsel,s,line,,4
local,11,1,0,0,0, Â Â
nsll,,1 Â Â Â Â Â
nrotate,all     Â
D,ALL, uX, , , , ,, , , , , Â Â
lsel,s,line,,1
local,11,1,0,0,0, Â Â
nsll,,1 Â Â Â Â Â
nrotate,all    Â
D,ALL,, , , , ,UX, , , , , Â Â
F,ALL,FZ,-1/25
/sol
PSTRES,1
solve
finish
/sol
ANTYPE,1 Â
BUCOPT,LANB,2,0,0,CENTER
solve
finish
/post1
set,list -
August 26, 2024 at 10:37 pm
www.chanees777
SubscriberAnyone please help, will be really appreciated. I have been stuck on this for over a week now.
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August 27, 2024 at 3:21 pm
dlooman
Ansys EmployeeSometimes it is good to run your input in batch mode. It is easier to find the error messages that way. When I do that with your input above I see the error:
*** WARNING *** Â Â Â Â Â Â Â Â Â Â Â Â CP = Â Â Â 0.109 Â TIME= 10:53:30
 No valid degree of freedom labels were input.  The D command is     Â
 ignored.ÂThat can be fixed like below:
! D,ALL,, , , , ,, , , , ,UZ
d,all,uz,0Â
I also saw these warnings during solution:Â
*** WARNING *** Â Â Â Â Â Â Â Â Â Â Â Â CP = Â Â Â 0.266 Â TIME= 10:53:30
 Node 97 on element 1 is unselected.That can be fixed with nsel,all before solution.
Your boundary condition at the vertical edges is an axial constraint. That doesn't seem right. Check your boundary conditions interactively with /pbc,all,1 and nplot.
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