Trapezoidal Steel Sheet model

[burtek]

Hi all,

i`m trying to model a trapezoidal steel sheet with ansys. I only applied gravitational force and got an unrealistic result. can anybody please help me to see my mistake?
(Technical information: thickness=0.00075m and weight=9.8kg/m2)
thanks in advance

/PREP7
K,1,-0.041,0,0,
K,2,0,0,0,
K,3,0.060,0.153,0,
K,4,0.179,0.153,0,
K,5,0.239,0,0,
K,6,0.280,0,0,
K,16,-0.041,0,9,
K,17,0,0,9,
K,18,0.060,0.153,9,
K,19,0.179,0.153,9,
K,20,0.239,0,9,
K,21,0.280,0,9,
LSTR, 1, 2
LSTR, 2, 3
LSTR, 3, 4
LSTR, 4, 5
LSTR, 5, 6
LSTR, 16, 17
LSTR, 17, 18
LSTR, 18, 19
LSTR, 19, 20
LSTR, 20, 21
LSTR, 16, 1
LSTR, 17, 2
LSTR, 18, 3
LSTR, 19, 4
LSTR, 20, 5
LSTR, 21, 6
FLST,2,4,4
FITEM,2,11
FITEM,2,12
FITEM,2,6
FITEM,2,1
AL,P51X
FLST,2,4,4
FITEM,2,2
FITEM,2,12
FITEM,2,13
FITEM,2,7
AL,P51X
FLST,2,4,4
FITEM,2,3
FITEM,2,14
FITEM,2,13
FITEM,2,8
AL,P51X
FLST,2,4,4
FITEM,2,4
FITEM,2,15
FITEM,2,14
FITEM,2,9
AL,P51X
FLST,2,4,4
FITEM,2,5
FITEM,2,16
FITEM,2,15
FITEM,2,10
AL,P51X
ET,1,SHELL181
R,1,0.00075, , , , ,9.8,
RMORE, , , , , , ,
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,200e9
MPDATA,PRXY,1,,0.3
FLST,5,4,4,ORDE,4
FITEM,5,1
FITEM,5,5
FITEM,5,-6
FITEM,5,10
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
LESIZE,_Y1, , ,2, , , , ,1
FLST,5,6,4,ORDE,2
FITEM,5,11
FITEM,5,-16
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
LESIZE,_Y1, , ,100, , , , ,1
FLST,5,6,4,ORDE,4
FITEM,5,2
FITEM,5,-4
FITEM,5,7
FITEM,5,-9
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
LESIZE,_Y1, , ,20, , , , ,1
MSHAPE,0,2D
MSHKEY,0
FLST,5,5,5,ORDE,2
FITEM,5,1
FITEM,5,-5
CM,_Y,AREA
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
AMESH,_Y1
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
/UI,MESH,OFF
FLST,2,606,1,ORDE,7
FITEM,2,1
FITEM,2,-303
FITEM,2,4344
FITEM,2,4364
FITEM,2,-4463
FITEM,2,6364
FITEM,2,-6565
/GO
D,P51X, ,0, , , ,ALL, , , , ,
ACEL,0,-10,0,
FINISH
/SOL
/STATUS,SOLU
SOLVE

 

[omidomidi]

i didn't check your model in ansys but i think you may have scaled the deformation into a larger deformation. for having a deformation shape in true scale you need to select "true scale" in the box at the bottom of he nodal solution window.
you haven't specified density.density is needed when you have gravity.
your model also may have large displacements so you need to use a nonlinear solution with nlgeom,on.

 

[burtek]

thanks for your repyl omidomidi.
i specified the thickniss and weight/area as Real Constants(R,1,0.00075, , , , ,9.8,)i think that i don`t need to define density. In reality this model carries the mass without any deformation.