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Pre-stress modal analysis in ABAQUS for circular cylindrical shell

anishiitk's picture

Dear all,

I am trying to perform a pre-stress modal analysis of a cylindrical shell in ABAQUS, and I am unable to transfer data from step-1 to step-2. Due to this
results are the same as the modal analysis of the beam without the
static force.

 

Anybody know the solution of this kind of problem, kindely let me know..

 email id: anish@iitk.ac.in

Thanking you in advance

Anish Kumar

Comments

Here are two examples:

 beam without prestress:

 /PREP7

 

K,1,0,0

K,2,1.01,0

L,1,2

 

ET,1,BEAM23,,1,,,,2

R,1,0.012

 

MP,EX,1,178000

MP,NUXY,1,0.3

MP,DENS,1,1000

 

ESIZE,0.1

LMESH,ALL

 

/SOLU

/SOLU

ANTYPE,MODAL               ! Select modal analysis type

MODOPT,LANB,5              ! Select the Block Lanczos mode-extraction method, 

                                             ! extracting 5 modes

D,1,ALL

D,2,ALL

 

SOLVE

 

Beam with prestress:

 /PREP7

 

K,1,0,0

K,2,1,0

L,1,2

 

ET,1,BEAM23,,1,,,,2

R,1,0.012

 

MP,EX,1,178000

MP,NUXY,1,0.3

MP,DENS,1,1000

 

ESIZE,0.1

LMESH,ALL

 

 

/SOLU

ANTYPE,STATIC               ! Select modal analysis type

PSTRES,ON

!nlgeom,on

 

                                             ! extracting 5 modes

D,1,ALL

D,2,UX,0.001

!D,2,UX,0

D,2,UY,0

D,2,ROTZ,0

SOLVE

FINISH

 

/SOLU

ANTYPE,MODAL               ! Select modal analysis type

PSTRES,ON

MODOPT,LANB,10              ! Select the Block Lanczos mode-extraction method, 

MXPAND,10,,,0

Solve

 

 

 

 

 

 

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