Author 
Message 
davide.riccio User
Joined: 19 Feb 2013 Posts: 14

Posted: Sat Jan 02, 2016 7:55 pm 


Hi guys,
after long time I'm using ansys again.
I have to solve a plate with hole and bending moment.
http://prntscr.com/9lbl1u
I have modeled half plate and applied symmetry condition
My doubt is how to simulate bending moment.
I thought to simulate as a linear distribution of pression on top side from 0 to p value.
In your opinion my idea is good or not?
Could anyone suggest me an other way to solve my problem.
I'd like to use 2 different way to solve my problem.
FINISH
/CLEAR
C***
C*** PARAMETERS
C***
L=0.5
B=0.5
FI=0.30
NE0=20
NE1=25
NE2=40
p=16E+007
! MATERIAL AND TYPE OF ELEMENT
/PREP7
MP,EX,1,2.1E+011
MP,PRXY,1,0.3
ET,1,82
! 0  plane stress w/thk
KEYOPT,1,3,3
R,1,0.01,
! TopDown GEOMETRY
K,1,0,0,0
K,2,B,0,0
K,3,B,B,0
K,4,B,B+L,0
K,5,0,B+L,0
K,6,B,B+L,0
K,7,B,B,0
K,8,B,0,0
K,9,0,B,0
L,1,2
L,2,3
L,3,4
L,4,5
L,5,6
L,6,7
L,7,8
L,8,1
L,9,3
L,9,5
L,9,7
L,9,1
AL,1,2,9,12
AL,9,3,4,10
AL,11,10,5,6
AL,8,12,11,7
CYL4,B,0,FI/2
ASBA,1,5
CYL4,B,0,FI/2
ASBA,4,1
AGLUE,ALL
! mesh
LSEL,S,LOC,Y,0,0
LESIZE,ALL,,,NE0
LSEL,S,LOC,Y,B+L,B+L
LESIZE,ALL,,,NE1
LSEL,S,LOC,Y,B,B+L
LSEL,U,LOC,Y,0,0
LSEL,U,LOC,Y,B,B
LSEL,U,LOC,Y,B+L,B+L
LESIZE,ALL,,,NE2
LSEL,S,LOC,X,0,0
LSEL,R,LOC,Y,0,B
LESIZE,ALL,,,NE1
LSEL,S,LOC,Y,B,B
LESIZE,ALL,,,NE1
LSEL,ALL
LSEL,R,LOC,X,B,B
LSEL,A,LOC,X,B,B
LSEL,R,LOC,Y,0,B
LESIZE,ALL,,,NE0
CSYS,1
LSEL,S,RADIUS
LSEL,INVE
LESIZE,ALL,,,NE1*2
CSYS,0
LSEL,ALL
LCCAT,11,12
LCCAT,9,12
MSHAPE,0
AMESH,ALL
ALLS
APLOT
! CONSTRAINS AND LOADS
LSEL,S,LOC,Y,0,0
DL,ALL,,SYMM
LSEL,ALL
SFL,5,PRES,p/2,0
SFL,4,PRES,p,p/2
ALLS
LPLOT
! solution
/SOLU
SOLVE
! postprocessing
/POST1
PLNSOL,S,Y
Thanks in advance.
D. Riccio
University of Salerno 

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kevin.badowski User
Joined: 29 Mar 2012 Posts: 11

Posted: Mon Jan 04, 2016 5:04 pm 


It seems like this is just a simple test of a stress concentration factor. Your tensile/compressive pressure loads are a good way to model this.
(edit: just make sure that there is no net force on the plate!)
You can also apply your moment using opposite forces on two nodes. There will be high stress where you applied the force, but this can be ignored, as the notch is sufficiently far away from the applied loads.
Personally, I would make a point mass element with rotational DOFs, RBE3 (distributed force/moment) the mass node to the edge of the plate, and apply the moment to the mass element. This way you have one less calculation to mess up.
Hope that helps,
Kevin Badowski
ASR Corp.
Quote: 
Hi guys,
after long time I'm using ansys again.
I have to solve a plate with hole and bending moment.
http://prntscr.com/9lbl1u
I have modeled half plate and applied symmetry condition
My doubt is how to simulate bending moment.
I thought to simulate as a linear distribution of pression on top side from 0 to p value.
In your opinion my idea is good or not?
Could anyone suggest me an other way to solve my problem.
I'd like to use 2 different way to solve my problem.
FINISH
/CLEAR
C***
C*** PARAMETERS
C***
L=0.5
B=0.5
FI=0.30
NE0=20
NE1=25
NE2=40
p=16E+007
! MATERIAL AND TYPE OF ELEMENT
/PREP7
MP,EX,1,2.1E+011
MP,PRXY,1,0.3
ET,1,82
! 0  plane stress w/thk
KEYOPT,1,3,3
R,1,0.01,
! TopDown GEOMETRY
K,1,0,0,0
K,2,B,0,0
K,3,B,B,0
K,4,B,B+L,0
K,5,0,B+L,0
K,6,B,B+L,0
K,7,B,B,0
K,8,B,0,0
K,9,0,B,0
L,1,2
L,2,3
L,3,4
L,4,5
L,5,6
L,6,7
L,7,8
L,8,1
L,9,3
L,9,5
L,9,7
L,9,1
AL,1,2,9,12
AL,9,3,4,10
AL,11,10,5,6
AL,8,12,11,7
CYL4,B,0,FI/2
ASBA,1,5
CYL4,B,0,FI/2
ASBA,4,1
AGLUE,ALL
! mesh
LSEL,S,LOC,Y,0,0
LESIZE,ALL,,,NE0
LSEL,S,LOC,Y,B+L,B+L
LESIZE,ALL,,,NE1
LSEL,S,LOC,Y,B,B+L
LSEL,U,LOC,Y,0,0
LSEL,U,LOC,Y,B,B
LSEL,U,LOC,Y,B+L,B+L
LESIZE,ALL,,,NE2
LSEL,S,LOC,X,0,0
LSEL,R,LOC,Y,0,B
LESIZE,ALL,,,NE1
LSEL,S,LOC,Y,B,B
LESIZE,ALL,,,NE1
LSEL,ALL
LSEL,R,LOC,X,B,B
LSEL,A,LOC,X,B,B
LSEL,R,LOC,Y,0,B
LESIZE,ALL,,,NE0
CSYS,1
LSEL,S,RADIUS
LSEL,INVE
LESIZE,ALL,,,NE1*2
CSYS,0
LSEL,ALL
LCCAT,11,12
LCCAT,9,12
MSHAPE,0
AMESH,ALL
ALLS
APLOT
! CONSTRAINS AND LOADS
LSEL,S,LOC,Y,0,0
DL,ALL,,SYMM
LSEL,ALL
SFL,5,PRES,p/2,0
SFL,4,PRES,p,p/2
ALLS
LPLOT
! solution
/SOLU
SOLVE
! postprocessing
/POST1
PLNSOL,S,Y
Thanks in advance.
D. Riccio
University of Salerno



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davide.riccio User
Joined: 19 Feb 2013 Posts: 14

Posted: Mon Jan 04, 2016 8:11 pm 


Thanks for your reply.
Anyway you're right: it's a simple tensile stress to evaluate stress concentration factor.
I'd like to model my bending moment with a linear distribution of pressione and after trying in a different way such as you suggest.
If the first model is valid I'll try the second.
Thanks a lot! 

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