Difference between shell99 and solid46

[simo7]

Hi
I don’t why I have different results when I’m using different finite elements (shell99 and solid46). I put the same loads(omega=1000). Could you help me !!!

/title, kaka
/prep7
ANTYPE,STATIC
et,1,shell99
R,1,1
RMORE
RMORE,1,0,.00025,1,60,.00025
RMORE,1,-60,.00025,1,-60,.00025
RMORE,1,60,.00025,1,0,.00025
RMORE,1,0,.00025,1,60,.00025
RMORE,1,-60,.00025,1,-60,.00025
RMORE,1,60,.00025,1,0,.00025
MP,EX,1,81.2e9
MP,EY,1,7e9
MP,EZ,1,7e9
MP,PRXY,1,0.3
MP,PRYZ,1,0.4
MP,PRXZ,1,0.3
MP,GXY,1,2.69E9
MP,GYZ,1,3.9E9
MP,GXZ,1,2.69E9
MP,DENS,1,145.46
pcirc,0.25,0.03,0,360
LESIZE,ALL, , ,15, ,1, , ,1,
AMESH,ALL
DL,5, ,ALL,0
DL,6, ,ALL,0
DL,7, ,ALL,0
DL,8, ,ALL,0
OMEGA,0,0,1000,0
FINISH
/SOLU
SOLVE
FINISH
/POST1
PLDISP,0
ANMODE,10,0.5, ,0
______________________________________________
/title, SOLID46
/prep7
ANTYPE,STATIC
et,1,solid46
R,1,1
RMORE
RMORE,1,0,.00025,1,60,.00025
RMORE,1,-60,.00025,1,-60,.00025
RMORE,1,60,.00025,1,0,.00025
RMORE,1,0,.00025,1,60,.00025
RMORE,1,-60,.00025,1,-60,.00025
RMORE,1,60,.00025,1,0,.00025
MP,EX,1,81.2e9
MP,EY,1,7e9
MP,EZ,1,7e9
MP,PRXY,1,0.3
MP,PRYZ,1,0.4
MP,PRXZ,1,0.3
MP,GXY,1,2.69E9
MP,GYZ,1,3.9E9
MP,GXZ,1,2.69E9
MP,DENS,1,145.46
CYLIND,0.25,0.03,0,0.003,0,360
LESIZE,1, , ,15 , ,1, , ,1,
LESIZE,2, , ,15 , ,1, , ,1,
LESIZE,3, , ,15 , ,1, , ,1,
LESIZE,4, , ,15, ,1, , ,1,
LESIZE,5, , ,15 , ,1, , ,1,
LESIZE,6, , ,15 , ,1, , ,1,
LESIZE,7, , ,15 , ,1, , ,1,
LESIZE,8, , ,15 , ,1, , ,1,
LESIZE,9, , ,15 , ,1, , ,1,
LESIZE,10, , ,15 , ,1, , ,1,
LESIZE,11, , ,15 , ,1, , ,1,
LESIZE,12, , ,15 , ,1, , ,1,
LESIZE,13, , ,15 , ,1, , ,1,
LESIZE,14, , ,15 , ,1, , ,1,
LESIZE,15, , ,15 , ,1, , ,1,
LESIZE,16, , ,15 , ,1, , ,1,
LESIZE,17, , ,1, ,1, , ,1,
LESIZE,18, , ,1, ,1, , ,1,
LESIZE,19, , ,1, ,1, , ,1,
LESIZE,20, , ,1, ,1, , ,1,
VSWEEP,1
DA,5,ALL,0
DA,6,ALL,0
OMEGA,0,0,1000,0
FINISH
/SOLU
SOLVE
FINISH
/POST1
PLDISP,0
ANMODE,10,0.5, ,0

thanks for any help

 

[Drej]

I haven't run your models, but I assume that the model using solid46 has a stiffer response? All other things being equal, I suspect the reason for different answers is because of mesh density. Make sure you have at least three elements through thickness in the case of the solid46 model and a representative number (at least the same as the shell model) cross-width, and then re-compare.


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