压杆稳定性分析
再求解屈曲分析时，出现了Block Lanczos solver failure.The assembled stress stiffness matrix contains all zeroes.No load factor solution is possible. 的错误。命令流如下，
/PREP7
ET,1,BEAM188
KEYOPT,1,1,1
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,2.1e11
MPDATA,PRXY,1,,0.3
SECTYPE, 1, BEAM, CSOLID, , 0
SECOFFSET, CENT
SECDATA,50,0,0,0,0,0,0,0,0,0,0,0
K, ,0,0,0,
K, ,5000,0,0,
K, ,15000,0,0,
LSTR, 1, 2
LSTR, 2, 3
TYPE, 1
MAT, 1
REAL,
ESYS, 0
SECNUM, 1
!*
FLST,5,2,4,ORDE,2
FITEM,5,1
FITEM,5,-2
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1,100, , , , , , ,1
!*
FLST,2,2,4,ORDE,2
FITEM,2,1
FITEM,2,-2
LMESH,P51X
FINISH
/SOL
!*
ANTYPE,0
PSTRES,1
FLST,2,1,3,ORDE,1
FITEM,2,1
!*
/GO
DK,P51X, , , ,0,ALL, , , , , ,
FLST,2,2,3,ORDE,2
FITEM,2,2
FITEM,2,-3
!*
/GO
DK,P51X, , , ,0,UX,UY,UZ, , , ,
FLST,2,1,3,ORDE,1
FITEM,2,1
!*
/GO
FK,P51X,FX,7860
FLST,2,1,3,ORDE,1
FITEM,2,3
!*
/GO
FK,P51X,FX,-7860
/STATUS,SOLU
SOLVE
FINISH
/SOL
ANTYPE,1
!*
!*
BUCOPT,LANB,1,0,0,CENTER
MXPAND,1,0,0,0,0.001,
/STATUS,SOLU
SOLVE
求大神解惑 约束施加有问题，改成
FLST,2,1,3,ORDE,1
FITEM,2,1
!*
/GO
DK,P51X, , , ,0,UX,UY,UZ,ROTY, , ,
FLST,2,2,3,ORDE,2
FITEM,2,2
FITEM,2,-3
!*
/GO
DK,P51X, , , ,0,UY,UZ,ROTY, , , ,
后，提示Repeated Lanczos shift and factorize steps did not yield additional buckling modes in the requested eigenvalue range.Either the modes are widely separated or, there are only 0 modes in the neighborhood specified by SHIFT value in BUCOPT command.
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